Relevant bibliographies by topics / Concrete-filled tube (CFT)

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Concrete-filled tube (CFT)'

Author: Grafiati
Published: 19 February 2023

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Journal articles on the topic "Concrete-filled tube (CFT)"

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Liu, Jui Ling, Dung M. Lue, and Ping T. Chung. "Impact on the Strength of Newly-Placed Concrete-Filled Tube under Earthquake Excitation." Applied Mechanics and Materials 284-287 (January 2013): 1345–50. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1345.

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The Chi-Chi earthquake caused significant loss of property and life. This phenomenon disclosed many design-related in the construction industry. The first condition that we would like to determine is whether the earthquake affected the final strength of newly-cast concrete if the fresh concrete was cast just before the earthquake struck, particularly when the fresh concrete was cast just before its initial or final setting. This study aims to investigate the effects of an earthquake on fresh concrete. Twenty specimens were fabricated to investigate the effects of strong ground motion on concrete. Of the 20 specimens, 9 were lightweight-concrete-filled CFT (Concrete Filled Tube) columns, 9 were CFT columns filled with concrete of normal weight, and the remaining two were pure steel hollow tubes. The specimens were leveled on a shaking table to simulate the strong ground motion caused by an earthquake. The test reveals that the lightweight-concrete-filled CFT columns are unaffected by the quake. However, the normal weight concrete filled CFT columns are slightly affected by the quake.
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Qiu, Wen Liang, Meng Jiang, and Le Zhou. "Seismic Performance of Reinforced Concrete Pier with Inside Concrete Filled Steel Tube." Advanced Materials Research 163-167 (December 2010): 4194–98. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4194.

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A reinforced concrete column with inside concrete filled steel tube (RC-CFT) has many advantages over reinforced concrete (RC) column, such as higher compression, shear and moment capacity, higher ductility. So this kind of composite column has been used as frame column in buildings. In this paper, the composite columns are used as piers of a continuous bridge to improve the seismic performance. Using nonlinear time-history analysis method and fiber element model, considering elasto-plastic nonlinearity, the nonlinear relationships between lateral load and horizontal displacement of RC-CFT pier and RC pier are calculated, and the seismic behaviors of continuous bridges with the two types of piers are analyzed. Based on the comparison of the results, it is found that the ductility of RC-CFT pier is much larger than RC pier. Under the same intensity earthquakes, the damage of RC-CFT pier is less than the RC pier, and RC-CFT pier is more safe and easy to be repaired after earthquake.
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Wang, Ying, Xiao Yu Wang, and Jin Hua Xu. "Investigation of Concrete Filling Result in a New Concrete Filled Steel Tube Structure Using Concrete Visual Model." Materials Science Forum 675-677 (February 2011): 945–48. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.945.

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Self-compacting concrete (SCC) is employed to construct a new CFT column-CFT beam frame structure in this research. In order to further assess filling result of SCC in the long steel tube to ensure good compaction rate, a 1/4 scale column-beam subassembly made of acrylics tube and concrete visual model, in which fresh concrete is simulated through mortar phase and coarse aggregate phase, are adopted to do the simulation experiment work. The experiment result shows that good filling result is able to be obtained inside the subassembly which indicates that the new CFT column-CFT beam frame structure is possible to be constructed in the real building.
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Nguyen, Doan-Binh, Wei-Sheng Lin, and Wen-Cheng Liao. "Long-Term Creep and Shrinkage Behavior of Concrete-Filled Steel Tube." Materials 14, no. 2 (January 8, 2021): 295. http://dx.doi.org/10.3390/ma14020295.

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A concrete-filled steel tube (CFT) combines the advantages of concrete and steel in construction and structural applications. However, research on the time-dependent deformation of the CFT under long-term sustained loading are still limited, particularly for stress transfer between the steel tube and concrete due to creep. This study investigated the creep behavior of CFT over a long period of 400 days. The creep and shrinkage strain of CFT was significantly lower than those of concrete that was not confined within a steel tube. The vertical strains of the steel tube and concrete core were almost identical, and it was shown that they were well bonded and acted as a composite. The vertical stress of steel increased by 32.7%, whereas the vertical stress of concrete decreased by 15.8% at 375 days. The stress transfer is notable and cannot be neglected in CFT design. Moreover, the results of creep and shrinkage were compared to prediction values of the B4 model and B4-TW model to verify their validity.
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Nguyen, Doan-Binh, Wei-Sheng Lin, and Wen-Cheng Liao. "Long-Term Creep and Shrinkage Behavior of Concrete-Filled Steel Tube." Materials 14, no. 2 (January 8, 2021): 295. http://dx.doi.org/10.3390/ma14020295.

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A concrete-filled steel tube (CFT) combines the advantages of concrete and steel in construction and structural applications. However, research on the time-dependent deformation of the CFT under long-term sustained loading are still limited, particularly for stress transfer between the steel tube and concrete due to creep. This study investigated the creep behavior of CFT over a long period of 400 days. The creep and shrinkage strain of CFT was significantly lower than those of concrete that was not confined within a steel tube. The vertical strains of the steel tube and concrete core were almost identical, and it was shown that they were well bonded and acted as a composite. The vertical stress of steel increased by 32.7%, whereas the vertical stress of concrete decreased by 15.8% at 375 days. The stress transfer is notable and cannot be neglected in CFT design. Moreover, the results of creep and shrinkage were compared to prediction values of the B4 model and B4-TW model to verify their validity.
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Lv, Jing, Tianhua Zhou, Qiang Du, Kunlun Li, and Liangwei Jin. "Research on the Bond Behavior of Preplaced Aggregate Concrete-Filled Steel Tube Columns." Materials 13, no. 2 (January 9, 2020): 300. http://dx.doi.org/10.3390/ma13020300.

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In order to investigate the bond behavior of preplaced aggregate concrete-filled steel tube (CFT-PAC) columns and the difference of bond behavior between CFT-PAC columns and normal concrete-filled steel tube (CFT-NC) columns, a total of 11 columns were prepared and the push-out tests were conducted. The experimental parameters included the type of concrete (preplaced aggregate concrete and normal concrete), concrete strength (C40, C50 and C60), cross-section dimension (D = 219 mm, 299 mm and 351 mm) and the thickness of steel tube (t = 6 mm and 8 mm). The results indicated that the CTF-PAC columns had a similar load-slip curves with CFT-NC columns. The bond stresses of the CFT-PAC columns were higher than that of the PAC-NC columns at the same concrete strength. Increasing compressive strength of PAC increased the critical bond strength and bond strength of CFT-PAC columns. With an increase of the L/D ratio, both of the slip corresponding to peak load and bond strength of CFT-PAC columns exhibited an increasing trend. A rise in the D/t ratio led to a decrease in the bond stress of CFT-PAC columns and an increase in slip corresponding to the peak load of CFT-PAC columns. The proposed bond stress–slip relationship model considerably matched the bond stress–slip relationship of CFT-PAC columns.
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Lee, Hak-Eun. "Evaluation of P-M Interaction Curve for Circular Concrete-Filled Tube (CFT) Column." Journal of the Korean Society of Civil Engineers 34, no. 2 (2014): 355. http://dx.doi.org/10.12652/ksce.2014.34.2.0355.

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Zhao, Hua, Rui Han, Weiguang Yuan, Shichun Zhao, and Yuping Sun. "Elastoplastic Analysis of Circular Steel Tube of CFT Stub Columns under Axial Compression." Materials 15, no. 22 (November 21, 2022): 8275. http://dx.doi.org/10.3390/ma15228275.

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Composite action between the components of the concrete-filled steel tube (CFT) is complex and it is difficult to accurately obtain the experimental relationship between the steel tube and the core concrete of CFT columns. The triaxially stressed core concrete has been studied by hydrostatic test in past research, while little research has been focused on the mechanical behavior of steel tube of CFT columns. It is difficult to obtain the experimental constitutive relationship of the steel tube of CFT columns to reflect the real-time influence of biaxial stress state and local buckling of steel plate on the steel tube. To clarify the mechanical behavior of the steel tube of CFT columns, this paper proposed an elastoplastic analytical method considering biaxial stress state and local buckling of steel tube to obtain the stress–strain curve of the steel tube. This method applied the Hook’s law and the plasticity theory to interpret the information conveyed by the measured vertical and hoop strain histories of the steel tube. To verify its effectiveness, 11 circular concrete-filled steel tube stub columns were fabricated and tested under axial compression. Superposition results of the axial load–strain of steel tube and core concrete were compared against the experimental curves. The widely used Sakino–Sun model of the confined concrete was adopted to calculate the axial load–strain curve of the core concrete. Satisfactory agreements between the calculated and experimental results confirmed the rationality of the proposed method in tracing the constitutive relation of the biaxially stressed steel tube even after the occurrence of the local buckling. The obtained stress–strain relationship is critical for establishment of mathematical constitutive model and finite element model of steel tube.
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Liu, Jing, Wen-jun Wang, Fa-xing Ding, Xin-fa Zeng, Zhe Tan, Yan Huang, and Bao-quan Wang. "Behavior of Axially Loaded Stirrup Confinement Rectangular Concrete-Filled Steel Tubular Stub Columns." Advances in Civil Engineering 2019 (December 2, 2019): 1–8. http://dx.doi.org/10.1155/2019/2712091.

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This article presents the experimental and finite element (FE) analyses of two conventional rectangular concrete-filled steel tubular (CFT) stub columns, two stiffened rectangular concrete-filled steel tubular (SCFT) stub columns, and two stirrup confinement rectangular concrete-filled steel tubular (CCFT) stub columns concentrically loaded in compression to failure. The influences of the ductility and ultimate bearing strength of these stub columns with stiffening ribs or spiral stirrup confinement were discussed. Abaqus was used to establish a 3D FE model and analyze the properties of CFT stub columns subjected to axial compression. The effect of the concrete core and rectangular steel tube under loop stirrup confinement was discussed. Analytical results showed that spiral stirrup confinement can availably retard the local bucking of the rectangular steel pipe, and the effect of the spiral stirrup confinement was stronger than that of stiffeners. The DI values of SCFT and CCFT were 21.9% and 31.9% larger than those of CFT, respectively. The ultimate capacity values of SCFT and CCFT were 10.2% and 18% larger than those of CFT, respectively. The ductility and ultimate bearing strength of the specimens improved effectively under spiral stirrup confinement, and the ductility of the CCFT columns was preferable to that of the SCFT columns.
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Wang, Ying, Miao Li, Jin Hua Xu, and Zhe Zhang. "Comparison between New Concrete Filled Steel Tube Frame Structure and Steel Frame Structure." Applied Mechanics and Materials 204-208 (October 2012): 1024–27. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.1024.

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Concrete filled steel tube (CFT) structure has advantages of the high tensile strength and ductility of steel in addition to the high compressive strength and stiffness of concrete. This research proposes a new CFT column-CFT beam frame structure. In order to validate the cost performance of the new CFT column-CFT beam frame structure, designs were carried out for building frames using both the new CFT column-CFT beam frame structure and conventional steel frame structure. The amount of consumed materials and cost estimations of each designed new CFT and conventional steel building frame are analyzed and compared. The result shows that the new CFT column-CFT beam frame structure is able to exhibit high cost performance than conventional steel frame structure.
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Dissertations / Theses on the topic "Concrete-filled tube (CFT)"

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Jamaluddin, Norwati. "Behaviour of elliptical concrete-filled steel tube (CFT) columns under axial compression load." Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/11322/.

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This thesis describes a research of the behaviour of the elliptical CFT columns under axial loading. The most substantial part of this research is experimental works conducted on twenty-seven specimens including the hollow stub columns as references. Parameters such as slenderness ratio, uni-axial compressive strength of concrete infill and the aspect ratio were considered to investigate their influence on the behaviour on these columns. The results presented are the first member buckling tests on elliptical CFT columns. Keys results from the tests have been presented and discussed. Parallel with the experimental works, numerical analyses were carried out and verified with the experimental results. Parametric studies were performed following the validation of the numerical models. As there is no design guidance seems to be available in any standard, thus this research provides a review of the existing design standards of Eurocode 4 (EC4) and American Specifications (AISC). The design expressions from these current design provisions for circular, square and rectangular concrete- filled tubes design strengths were used to predict the capacities of elliptical eFT columns. The influences of concrete enhancement, steel reduction due to biaxial effects and column slenderness were all incorporated in design rules of EC4. Based on the experimental, numerical findings the evaluations were made on the design rules of the codes. This investigation was aimed at providing reliable design guidelines for practising engineers to employ the elliptical concrete-infill columns in the construction industry.
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Perea, Tiziano. "Analytical and experimental study on slender concrete-filled steel tube columns and beam-columns." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37303.

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The use of composite steel-concrete columns and beam-columns in many structural systems is increasing globally due to the intrinsic synergy when these materials are designed and detailed together properly. However, limited test data are available to justify the structural system response factors and comprehensive design equations in current design specifications. This research, through the testing of 18 full-scale, slender concrete-filled steel tube (CFT) beam-columns, attempts to address the latter need. The circular and rectangular CFT specimens tested for this research are by far the longest and the most slender full-scale CFT members tested worldwide. These CFT specimens were subjected to a complex load protocol that includes pure compression, uniaxial and biaxial bending combined with compression, pure torsion, and torsion combined with compression. In addition, data from the hydrostatic pressure on the steel tubes due to the fresh concrete at casting was evaluated. The single most important contribution of this research is the clarification of the interaction between strength and stability in slender composite concrete-filled columns and beam-columns. Parallel to the experimental study, advanced computational analyses were carried out to calibrate material and element models that characterize the salient features of the observed CFT response, such as steel local buckling and residual stresses, concrete confinement, stability effects, strength, and stiffness degradation, among others. Based on the observed behavior, simplified guidelines for the computation of the strength and stiffness parameters for CFT columns and beam-columns are proposed for design purposes.
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Kataoka, Marcela Novischi. "Estudo do comportamento de ligações viga-pilar preenchido submetidas a ações cíclicas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-20092011-112655/.

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No presente trabalho foi analisado o comportamento de ligações viga-pilar em estruturas mistas de aço e concreto com o auxílio de simulação numérica e experimentação. A simulação numérica foi realizada no programa DIANA, baseado no método dos Elementos Finitos. Os modelos de ligações analisados são compostos por ligações com parafusos passantes entre pilares metálicos preenchidos com concreto e vigas metálicas. A laje utilizada foi do tipo com fôrma de aço incorporada, com a utilização de conectores de cisalhamento para resistir aos esforços em conjunto com a viga. Para simular a situação de pilar intermediário, foram utilizados modelos com formato cruciforme, os quais foram submetidos à força cíclica reversível com a finalidade de submeter à estrutura a esforços semelhantes aos provocados por vento e sismo. Além do efeito da força cíclica, este trabalho avaliou também a influência na rigidez da ligação causada pela taxa de armadura da laje e pelo detalhe de ancoragem da armadura de continuidade ao pilar misto. Para isso foram ensaiados quatro modelos. Dentro da metodologia proposta, obteve-se numérica e experimentalmente, dados que permitiram a construção de curvas momento versus rotação e força versus deslocamento para a quantificação da rigidez e determinação da ductilidade da ligação. Como resultado das análises concluiu-se que a laje contribui mais na rigidez da ligação quando ela está submetida a momento fletor positivo e com relação ao método de ancoragem não houve diferença significativa nas rigidezes.
This research studied the behavior of beam-column connection in composite steel-concrete structures and was developed with the use of numerical simulation and experimentation. The numerical simulation was performed using the program DIANA which is based on the finite element method. The models are composed of connections with bolts passing through the concrete filled tube (CFT) column and steel beams with a steel deck. It was used shear connectors for the slab works together with the beam to resist the bend. To simulate the situation of the middle column, they are used models with cruciform form, which were subjected to reversible cyclic loading in order to bring structure the efforts similar to those caused by wind and earthquake. Besides the effect of cyclic loading, this research also evaluated the influence on the connection stiffness caused by the slab reinforcement ratio and anchors detail to the column of some bars. To obtain this information four models were tested. Within the proposed methodology numerical and experimental data were obtained which made possible the construction of moment versus rotation curves and loading versus displacement for the quantification of stiffness and ductility of the connections. The result of this research shows that the slab contributes more on the increase of stiffness when the connection is subjected to sagging moment and about the method of anchoring, there is no significant difference on stiffness between the two methods.
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Hernández, Figueirido David. "Estudio experimental del pandeo de perfiles tubulares rectangulares de acero, rellenos de hormigón de alta resistencia, bajo carga axial y diagrama de momentos variables." Doctoral thesis, Editorial Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/14724.

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El empleo de estructuras mixtas de acero-hormigón ha experimentado un aumento creciente en las últimas décadas, dado qu permiten un mejor aprovechamiento de las características de los materiales empleados, en comparación con estructuras de hormigón armado y acero trabajando de forma independiente. Este trabajo de investigación se centra en el estudio y análisis de pilares mixtos de tipo perfil tubular de acero, CFT (Concrete Filled Tube), rectangular o cuadrado, rellenos de hormigón de alta resistencia. Este tipo de pilares cuenta con ventajas respecto a otros pilares mixtos como el hecho de que el perfil de acero sirve de enconfrado para el núcleo de hormigón y a su vez, cuenta con suficiente capacidad resistente como para soportar las cargas exixtentes en fase de construcción. Todo ello permite un importante ahorro, tanto económico, como en las plazos de ejecución. Otras ventajas de estos pilares es que el perfil tubular confina el núcleo de hormigón y este a su vez evita que se produzca el pandeo local del tubo de acero, permitiendo así su plastificación y máximo aprovechamiento. Estas ventajas, proporcionan a los soportes ductibilidad característica muy importante frente a la acción sísima, de ahí que el uso de este tipo de pilares se haya extendido en países como Japón, Estados Unidos y China. Es importante, también, destacar el aumento de resistencia al fuego del sistema en comparación con un perfil de acero hueco. A partir del análisis del estado actual del conocimiento se ha planteado una campaña experiemental que cubre los aspectos no estudiados hasta el momento, y que constituyen los casos más habituales en la práctica real: soportes esbeltos o semiesbeltos sometidos a carga axial y diagrama de momentos no constante. En total se han efectuado 78 ensayos sobre pilares mixtos. Los resultados experimentales se comparan con las previsiones de las normativas de referencia más importantes para el cálculo de pilares mixtos: EC4, AISC 2010, BS5-400:2005, AS5100-6, DBJ13-51, etc, comprobando su validez para el tipo de pilar estudiado. Finalmente se ha planteado un modelo de cálculo simplificado basado en el método de amplificación de momentos y se ha ajustado el factor de rigidez a flexión de los pilares, así como un factor de conversión a diagrama de momentos constantes.
Hernández Figueirido, D. (2012). Estudio experimental del pandeo de perfiles tubulares rectangulares de acero, rellenos de hormigón de alta resistencia, bajo carga axial y diagrama de momentos variables [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/14724
Palancia
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Gao, Yu. "Innovative Self-Centering Connection for CCFT Composite Columns." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/78390.

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Concrete filled steel tubes are regarded as ideal frame members in seismic resisting systems, as they combine large axial and flexural capacity with ductility. The combination of the two materials increases the strength of the confined concrete and avoids premature local buckling of the steel tube. These benefits are more prominent for circular than for rectangular concrete filled steel tubes. However, most common connection configurations for circular concrete filled tubes are not economic in the US market due to (a) the desire of designers to use only fully restrained connections and its associated (b) high cost of fabrication and field welding. Research indicates that well designed partially restrained connections can supply equal or even better cyclic behavior. Partially restrained connections also possess potential capability to develop self-centering system, which has many merits in seismic design. The goal of this research is to develop a new connection configuration between circular concrete filled steel columns and conventional W steel beams. The new connection configuration is intended to provide another option for rapid assembling on site with low erection costs. The proposed connection is based on an extended stiffened end plate that utilizes through rods. The rods are a combination of conventional steel and shape memory alloy that provide both energy dissipation and self-centering capacity. The new connection configuration should be workable for large beam sizes and can be easily expanded to a biaxial bending moment connection.
Ph. D.
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Giakoumelis, G., and Dennis Lam. "Axial Capacity of Circular Concrete¿filled Tube Columns." 2004. http://hdl.handle.net/10454/5652.

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no
The behaviour of circular concrete-filled steel tubes (CFT) with various concrete strengths under axial load is presented. The effects of steel tube thickness, the bond strength between the concrete and the steel tube, and the confinement of concrete are examined. Measured column strengths are compared with the values predicted by Eurocode 4, Australian Standards and American Codes. 15 specimens were tested with 30, 60 and 100 N/mm2 concrete strength, with a D/t ratio from 22.9 to 30.5. All the columns were 114 mm in diameter and 300 mm in length. The effect due to concrete shrinkage is critical for high-strength concrete and negligible for normal strength concrete. All three codes predicted lower values than that measured during the experiments. Eurocode 4 gives the best estimation for both CFT with normal and high-strength concrete.
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(9810410), Huigyeong Kim. "Experimental investigation of the structural behaviour of concrete-filled FRP tubes." Thesis, 2015. https://figshare.com/articles/thesis/Experimental_investigation_of_the_structural_behaviour_of_concrete-filled_FRP_tubes/13438292.

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Concrete-filled tubes (CFTs) are structural columns used to support compressive loads. A CFT takes advantage of the lateral confinement of the tube on the concrete core to increase the column strength. Since the development of CFT structures, steel has been the primary tube material. Over the last two decades however, fibre reinforced polymers (FRPs) have been increasingly used as tube materials because of their superior properties such as high specific strength and stiffness, superior corrosion resistance and good durability. This thesis describes a systematic experimental study of CFT columns with FRP as the tube material. This master’s project investigates the performance of FRP tubes of different properties and sizes. For this purpose, 12 CFT specimens with the length over diameter (L/D) ratios of 8 and 12, and diameter over tube thickness (D/t) ratios ranging from 11 to 43 were tested under compressive force with both ends of the columns set as pin joints. The experiments were carried out using a heavy loading machine and the experimental results are analysed in terms of strength and failure modes. The experimental results showed the significant improvements in column strength due to the confinement of the FRP tubes. It was demonstrated that while both L/D and D/t ratios influence column strength, D/t ratio plays a particularly important role in determining the column strength. The experimental results also showed the changes in failure modes with L/D and D/t ratios. To compare FRP tubes with plain concrete columns, an equivalent slenderness ratio for the CFT with FRP tube was derived. The equivalent slenderness ratio had good agreement with the D/t ration of the FRP tube. It was demonstrated that the equivalent slenderness can be used to determine the capacity of the CFT column using its D/t ratio.
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Ye, Y., L.-H. Han, Therese Sheehan, and Z.-X. Guo. "Concrete-filled bimetallic tubes under axial compression." 2016. http://hdl.handle.net/10454/10178.

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Yes
This paper presents the experimental results of axial compression tests on concrete-filled bimetallic tubes (CFBT). The cross section of the bimetallic tube is composed of an outer layer made of stainless steel and an inner layer made of carbon steel. A total of 12 specimens with a circular cross section were tested under axial compression. The test parameters included the thickness of the stainless steel tube layer (tss=0-1.36 mm) and the compressive strength of the infilled concrete (fcu=21.1-42.8 MPa). Test results showed that, the two layers of the bimetallic tube worked well together, and the CFBT specimens exhibited ductile characteristics. The influence of the parameters on the failure mode, load versus deformation relationship, axial compressive strength, and strain development of the tested specimens were investigated. Finally, the feasibility of three existing design codes for predicting the axial compressive strength of CFST under axial compression was evaluated.
Tsinghua University Initiative Scientific Research Program, China Postdoctoral Science Foundation
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Lai, Yu Ching. "MOMENT CONNECTIONS OF CONCRETE-FILLED FIBRE REINFORCED POLYMER TUBES TO REINFORCED CONCRETE FOOTINGS." Thesis, 2010. http://hdl.handle.net/1974/5408.

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Fiber reinforced polymers (FRPs) are increasingly being accepted in structural engineering applications. One promising system involves the use of concrete-filled FRP tubes (CFFTs) as bridge piers, columns or piles. While CFFT members have been extensively studied under various loading conditions, very little attention has been given to their connections to other structural components such as footings and beams. This study explores two different moment connections for CFFT members, using 13 medium-scale specimens and seven ancillary tests. The first connection involves embedment of the FRP tube into the concrete foundations during casting. Five-219 mm diameter (D) precast CFFTs were embedded into 500x500x500 mm concrete foundation each, at different embedment lengths ranging from 0.3D to 1.5D and tested in flexure as cantilevers with 1100 mm spans. The study showed that the optimal embedment length was 0.73D. This was essentially the minimum embedment length necessary to produce tension failure of the CFFT member outside the footing, rather than premature bond failure that would otherwise occur at lower loads. Additionally, six push-through tests were conducted on CFFT stubs embedded into footings. The average bond strength was found to be 0.75 MPa. The second connection involved adhesive bonding of hollow FRP tubes to short reinforced concrete circular stubs protruding from concrete footings. The remainder of the tube was then filled with concrete, without the need for shoring. Four-169 mm diameter FRP tubes were first adhesively bonded onto footings with heavily steel-reinforced concrete stubs varying in length from 0.5D to 2.0D, and tested as cantilevers with 1300 mm spans. The optimal bond length that would lead to flexural failure of the tube just outside the stub, rather than bond failure, was about 1.1D. Based on this, two additional specimens with 1.5D stubs having varying steel reinforcement ratio (ρ) in the stubs were tested. It was shown that the optimal ρ was 2.5%. Finally, the effect of low cycle reversed bending fatigue was studied using two additional specimens, including one with a sustained axial load of 15-19% of the CFFT axial capacity. Remarkable levels of ductility associated with the plastic hinge forming in the stub were observed.
Thesis (Master, Civil Engineering) -- Queen's University, 2010-01-28 16:09:40.606
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Ren, Q.-X., L.-H. Han, Dennis Lam, and W. Li. "Tests on elliptical concrete filled steel tubular (CFST) beams and columns." 2014. http://hdl.handle.net/10454/10304.

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This paper presents a series of test results of elliptical concrete filled steel tubular (CFST) beams and columns to explore their performance under bending and compression. A total of twenty-six specimens were tested, including eight beams under pure bending and eighteen columns under the combination of bending and compression. The main parameters were the shear span to depth ratio for beams, the slenderness ratio and the load eccentricity for columns. The test results showed that the CFST beams and columns with elliptical sections behaved in ductile manners and were similar to the CFST members with circular sections. Finally, simplified models for predicting the bending strength, the initial and serviceability-level section bending stiffness of the elliptical CFST beams, as well as the axial and eccentric compressive strength of the composite columns were discussed.
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Book chapters on the topic "Concrete-filled tube (CFT)"

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Geng, Yue, Gianluca Ranzi, Yu-yin Wang, Raymond Ian Gilbert, and Sumei Zhang. "State-of-the-art review on the time-dependent behaviour of composite steel-concrete columns." In Time-dependent behaviour and design of composite steel-concrete structures, 83–109. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/sed018.ch5.

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<p>This chapter presents a state-of-the-art review of the time-dependent behaviour of composite columns. The first part of the chapter outlines the available typologies and advantages of composite columns. This is followed by an overview of the time-dependent response of concrete (specific to composite columns) and an introduction to concrete confinement. The main part of the chapter is devoted to the state-of-the-art review on how concrete time effects influence the long-term and ultimate behaviour of concrete-filled steel tube (CFST) columns, and on the combined effects produced by sustained loading and chloride corrosion on CFST columns. The review then deals with the long-term behaviour of concrete-filled double skin tube (CFDST) and encased composite columns. The final parts of the chapter provide a review of the time-dependent differential axial shortening (DAS) in vertical components of multi-storey buildings and on the long-term response of arch bridges.</p>
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Yang, Zhishuo, Mingxia Chen, Feixin Chen, Zuorong Dong, and Yiman Zhong. "Application of ABAQUS by Using Python in Concrete-Filled Steel Tube." In Advances in Frontier Research on Engineering Structures, 419–26. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_37.

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AbstractConcrete-filled steel tube (CFST) column have remarkable mechanical properties and are widely used in engineering. In order to avoid repeated work, this paper introduces a concrete model based on Python, which is used for automatic simulation of CFST columns under different loads. The pre-treatment and finite element analysis of CFST columns are carried out by using the model software. Finally, examples were cited to illustrate that the simulation results of the model are similar to the test results, and the purpose of engineering application is achieved.
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Watfa, Abdul, Mark Green, Amir Fam, and Martin Noel. "Segmental Hollow Concrete Filled FRP Tubes (CFFT) for Wind Turbine Towers." In Lecture Notes in Civil Engineering, 472–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_40.

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Tiwary, Aditya Kumar, and Ashok Kumar Gupta. "Axial Loading Behaviour of Concrete Filled Steel Tube (CFST) Columns: A Parametric Study." In Lecture Notes in Civil Engineering, 873–83. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6557-8_71.

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Ahmed, Asmaa Abdeldaim, Mohamed Hassan, M. Iqbal Khan, and Radhouane Masmoudi. "Flexural Performance of Post-tensioned Rectangular Concrete-Filled FRP Tubes (CFFT) Beams Using High and Normal Strength Concrete." In Lecture Notes in Civil Engineering, 496–507. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_42.

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"Analytical investigation of through plate connection to Concrete Filled Tube (CFT) column." In Behaviour of Steel Structures in Seismic Areas, 369–74. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592-59.

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Mirghaderi, Rasoul, Yasaman Balazadeh Minouei, and Sanaz Ahlehagh. "Analytical investigation of through plate connection to Concrete Filled Tube (CFT) column." In Behaviour of Steel Structures in Seismic Areas. CRC Press, 2009. http://dx.doi.org/10.1201/9780203861592.ch50.

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"Examination of yield stress limitation for concrete filled steel tube (CFT) column using SM570TMC steel." In Tubular Structures XII, 111–20. CRC Press, 2008. http://dx.doi.org/10.1201/9780203882818-17.

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Jae Lee, Myung, E. Lee, and Young Suk Oh. "Examination of yield stress limitation for concrete filled steel tube (CFT) column using SM570TMC steel." In Tubular Structures XII, 93–102. Taylor & Francis, 2008. http://dx.doi.org/10.1201/9780203882818.ch10.

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Krishan, Anatoly. "Bearing Capacity of Concrete Filled Steel Tube Columns." In Sustainable Concrete [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99650.

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Concrete filled steel tubes columns of circular cross section (CFST) have significant constructive, technological, economic advantages. Therefore, CFST are increasingly used in construction practice. Due to the complex nature of CFST load resistance, regulations of the Europe, Australia, Brazil, India, Canada, China, the USA, Japan, and of a number of other countries recommend using empirical formulas for calculating their bearing capacity. Despite the large number of the experiments, serving as a basis for these formulas, they do not always allow to obtain valid results. Besides, these methods, as a rule, do not allow the calculations of compressed CFST elements, which have any differences from a “classical” design, for example, the presence of a high-strength rod and (or) spiral reinforcement, various types of concrete, the effect of preliminary lateral compression of a concrete core, etc. The purpose of this monograph is to propose the method of deformation calculation of the bearing capacity of compressed CFST elements under short-term load action based on the phenomenological approach and the theoretical positions of reinforced concrete mechanics.
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Conference papers on the topic "Concrete-filled tube (CFT)"

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Rehmat, Sheharyar, Amir Sadeghnejad, and Atorod Azizinamini. "Connection between Concrete Filled Tube (CFT) Columns and Prefabricated elements using UHPC." In Second International Interactive Symposium on UHPC. Iowa State University Digital Press, 2019. http://dx.doi.org/10.21838/uhpc.9675.

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Varma, Amit H., Jarupat Srisa-Ard, and Sangdo Hong. "Analytical Investigations of the Fire Behavior of Concrete Filled Steel Tube (CFT) Columns." In Structures Congress 2004. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40700(2004)125.

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Moon, Jiho, Dawn E. Lehman, and Charles W. Roeder. "Finite Element Analysis of Embedded Connections for Circular Concrete- Filled Tube (CFT) Columns." In 10th International Conference on Advances in Steel Concrete Composite and Hybrid Structures. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2615-7_088.

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Choi, Sung-Mo, Won Ho Choi, Kangseok Lee, Jae-Yong Ryoo, Sunhee Kim, and Yong-Pil Park. "Compressive performance of 50 MPa strength concrete-filled square and circular tube (CFT) columns using recycled aggregate." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7021.

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Recycled aggregate is an environmentally self-sustainable solution that can reduce construction waste and replace natural aggregates. However, there is a disadvantage in concrete such as initial strength drop and long-term strength development. Therefore, the interaction effect of the two materials can be expected by filling the cyclic aggregate concrete in the CFT column. In order to develop a concrete with compressive strength of 50 MPa as a recycled aggregate, we carried out a mixing experiment and fabricated 18 specimens to confirm the compressive behavior of a RCFT (Recycled Concrete Filled Tube) column that can be applied to actual buildings. Variable is the shape and thickness of steel pipe, concrete strength and mixing ratio, and coarse aggregate and fine aggregate are all used as recycled aggregate. The optimum mixing ratio for recycled aggregate concrete to be filled in the CFT filled steel pipe was found through three concrete preliminary mixing experiments. In addition, the compression test of the RCFT column was carried out to observe and analyze the buckling shape of the CFT column. Based on the analysis of the buckling configuration and the experimental data, the load-displacement curves of the specimens were drawn and the compressive behavior was analyzed.
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Albareda-Valls, Albert, Caio Cesar Milan, Jordi Maristany Carreras, and David Garcia Carrera. "Analysis of slab-column connections in CFT sections without continuity of the tube." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7152.

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When dealing with concrete-filled tube columns and RC slabs, it is usual to interrupt steel tubes in slab-column connections if the column is mainly compressed. Contractors do prefer to solve these connections with independent tubes, although innerreinforcements may be continuous through the slab. In these cases, both tubes from the upper and lower levels do have base plate connections, with a set of anchor bolts. This procedure saves a lot of time of global works, by making everything easier at the same time, as tubular profiles do not intersect the formwork.However, this reasonable design for slab-column joints suggest at least some questions about the strength of the concrete at the area of connection, where the tube has been interrupted. On the one hand, the load is transferred through concrete in the slab thickness, since there is no continuity of the tube; on the other hand, concrete at that point becomes triaxially confined due to the restriction to lateral deformation.This study analyses the validity of this connection method and the differences observed depending on the relative location of the column (corner, façade –lateral- or central pillars). Needless to say that the relative location of the column leads to differentconfinement patterns in concrete.
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Oleksik, John W., Tim M. Gilbert, and Sanjeev R. Malushte. "Use of Concrete Filled Tube (CFT) Vertical Braces in a Moderate / High Seismic Area." In Structures Congress 2009. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41031(341)104.

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Talebi, Elnaz, Manfred Korzen, Ana Espinós, and Sascha Hothan. "The effect of damage location on the performance of seismically damaged concrete filled steel tube columns at fire." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6984.

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In this paper, a nonlinear three-dimensional finite element (FE) model was developed and validated to study the effect of seismic damage location on the response of concrete filled tube (CFT) columns at fire after earthquakes. Three analyses were conducted consecutively in the modelling, namely, cyclic, thermal and structural. Results of the cyclic loading analysis comprising residual deformations were applied as the initial condition to the thermal-stress model, replicating the seismic performance of column. Following, a nonlinear sequentially coupled-thermal stress analysis was carried out to investigate the fire response of CFT columns after the seismic event. Three damage scenarios were contemplated, considering any possible potential damages that could be generated by the earthquake loading on CFT columns. The accuracy of proposed FE model was examined by comparing the numerical results with that of available tests on fire and cyclic loading. By means of validated model, the performance of damaged CFT columns was then investigated under fire after earthquakes. The level of damage was assumed as a high damage level, presuming that the column reached 50% of its lateral resistance while still maintaining its overall stability after the earthquake. The results were presented broadly, including the axial deformation history as well as the fire resistance time for CFT columns. To have a comprehensive insight on the influence of damage location in columns, the fire response of damaged specimens was compared with that of an intact one.
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Lai, Zhichao, and Amit Varma. "Analysis and behavior of high-strength rectangular CFT columns." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6957.

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The current AISC Specification (AISC 360-16) specifies the material strength limits for concrete-filled steel tube (CFT) columns. According to AISC 360-16, the steel yield stress (Fy) for CFT columns should not exceed 525 MPa, and the concrete compressive strength (f’c) should not exceed 70 MPa. CFT columns are classified as high strength if either Fy or f’c exceeds these specified limits, and are classified as conventional strength if both Fy and f’c are less than or equal to the limits. Due to lack of adequate research and comprehensive design equations, AISC 360-16 does not endorse the use of high-strength materials for CFT columns. This paper makes a contribution towards addressing this gap using a two-step approach. The first step consists of compiling an experimental database of high-strength rectangular CFT column tests in the literature and evaluating the possibility of extending the current AISC 360-16 design equations to high-strength rectangular CFT columns. The second step consists of developing and benchmarking detailed 3D nonlinear finite element models for predicting the behavior of high-strength CFT columns from the database. The benchmarked models are being used to perform comprehensive parametric studies to address gaps in the database and propose design equations for high-strength rectangular CFT members, which will be part of a future paper.
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"An Experimental Investigation on Concrete Filled Steel Tube Columns Under Axial Compression." In Recent Advancements in Geotechnical Engineering. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901618-9.

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Abstract. This paper presents an experimental investigation on the behaviour of concrete filled steel tube columns under axial compression. The steel columns were filled with self-compacting and self-curing concrete instead of normal conventional concrete. A test program consisting of square column, circular column and rectangular column was firstly conducted. The behaviour of three concrete filled steel tubular sections (CFSTs) under axial load is presented. The effect of steel tube dimensions, shapes and confinement of concrete are also examined. Measured column strengths are compared with the values predicted by Euro code 4 and American codes. Euro code 4, gives good estimation of self-compaction concrete. However, lower values as measured during the experiments were predicted by the American Concrete Institute (ACI) equation. Also, the effect of thickness of steel tubes, concrete cube strength and steel percentage is also studied. In addition to CFST column the steel tube also acts as confinement for concrete.
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Ibáñez Usach, Carmen, David Hernández-Figueirido, and Ana Piquer Vicent. "Influence of steel tube thickness and concrete strength on the axial capacity of stub CFST columns." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7196.

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In order to study the mechanical response of concrete-filled steel tubular (CFST) columns, several experimental and theoretical studies have been conducted in the last years. However, the influence of thin-walled steel tubes on the axial capacity of these composite columns is not completely stablished, especially when it is combined with high-strength concrete as infill. In this paper, the results of an experimental campaign on 9 concrete-filled steel tubular stub columns subjected to concentric load are presented. Different cross-section shapes are considered in this campaign, i.e. circular, square and rectangular. The influence of the steel tube wall thickness is analysed by including in the tests specimens with thin-walled tubes, whose behaviour needs to be studied in depth given the issues arising when working under compression. The experimental program is designed so the analysis of the results permits to drawn consistent conclusions. For each series, the steel tube thickness is the only geometric parameter modified in order to properly study its effect. Besides, two different concrete strengths were considered for the concrete infill, i.e. normal and high- strength concrete, to observe their effect on the ultimate capacity of the columns. During the tests, the specimens are subjected to axial load and the evolution of the axial displacement with the load is registered. The ultimate capacity of each specimen is obtained and an analysis of the steel tube thickness and concrete strength influence is accomplished. Finally, the study of the dependency of the failure mode on these parameters is carried out.
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Reports on the topic "Concrete-filled tube (CFT)"

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EXPERIMENTAL BEHAVIOR AND DESIGN OF RECTANGULAR CONCRETE-FILLED TUBULAR BUCKLING-RESTRAINED BRACES. The Hong Kong Institute of Steel Construction, December 2021. http://dx.doi.org/10.18057/ijasc.2021.17.4.5.

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This paper proposes a new design method for concrete-filled tubular buckling-restrained braces (CFT-BRBs) by incorporating the confinement effect on pre-buckling rigidity. A series of experiments are performed to investigate the effects of concrete strength and sectional dimension on the initial stiffness, ultimate strength, and energy dissipation behaviors. Experimental results indicate that the confined concrete plays an important role in the energy dissipating capacity of CFT-BRBs. On the other hand, the sectional dimensions of the steel tube and core are influential factors governing the ultimate failure modes of CFT-BRBs. The findings in study provide technical supports to optimize the design methods for ductile seismic performance of CFT-BRBs in low-rise and high-rise steel buildings.
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ANALYSIS AND DESIGN OF AXIALLY LOADED SQUARE CFST COLUMN TO RC BEAM JOINTS STIFFENED BY DIAGONAL RIBS. The Hong Kong Institute of Steel Construction, March 2023. http://dx.doi.org/10.18057/ijasc.2023.19.1.6.

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This work proposes a partially through-beam joint system to connect square concrete-filled steel tubular (CFST) columns and reinforced concrete (RC) beams. In the system, the holes in the steel tube allow longitudinal beam reinforcements to be continuous through the joint zone to achieve direct load-transfer of the beam, and the square steel tube with holes is strengthened by welding diagonal ribs located at the corners of the steel tube. Finite element (FE) analyses on joints with RC beams were carried out based on verified models. The analysis results showed that diagonal ribs welded to the joint tube confined the concrete in the joint zone efficiently and made up for the reduction in axial load capacity caused by the holes of the steel tube, so the joint system can meet the requirements of strong-joint weak-component under axial compression with ease. Finally, mechanics-based models and axial strength equations of joints were proposed, and the predicted results agreed well with the FE results. These results proved that the square CFST column to RC beam joints stiffened by diagonal ribs were feasible and can be applied in engineering practice based on reasonable design.
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CALCULATION METHOD OF ULTIMATE LOAD BEARING CAPACITY OF CONCRETE FILLED STEEL TUBULAR LATTICE COLUMNS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.095.

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To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.
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FINITE ELEMENT SIMULATION FOR ULTRA-HIGH-PERFORMANCE CONCRETE-FILLED DOUBLE-SKIN TUBES EXPOSED TO FIRE. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.263.

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Ultra-high-performance concrete (UHPC) or ultra-high-strength concrete (UHSC) are alternatively used to reduce construction materials, thereby achieving more sustainable constructions. Moreover, engaging the advantages of concrete cores and outer steel tubes in concrete-filled steel tubes (CFST) or ductile concrete-filled double-skin tubes (CFDST) is of great interest for the better performance of such members under fire. Nevertheless, current design provisions do not provide design models for UHPC-filled double-skin tubes under fire, and existing finite-element (FE) methodologies available in the literature may not accurately simulate the behaviour of CFDST exposed to fire. Therefore, this paper develops a comprehensive FE protocol implementing the scripting technique to model CFDST members for heat transfer and coupled (simultaneously or sequentially) thermal-stress analyses. Various modelling parameters incorporated in the proposed FE routine include the cross-sectional geometry (circular, elliptical, hexagonal, octagonal, and rectangular), the size (width, diameter, and wall thickness), interactions, meshing, thermal- and mechanical-material properties, and boundary conditions. The detailed algorithm for heat transfer analysis is presented and elaborated via a flow chart. Validations, verifications, and robustness of the developed FE models are established based on extensive comparison studies with existing fire tests available in the literature. As a result, and to recognize the value of the current FE methodology, an extensive parametric study is conducted for different affecting parameters (e.g., nominal steel ratio, hollowness ratio, concrete cylindrical strength, yield strength of metal tubes, and width-to-thickness ratio). Extensive FE results are used for optimizing the fire design of such members. Consequently, a simplified and accurate analytical model that can provide the axial load capacity of CFDST columns under different fire ratings is presented
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AN EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF CONCRETE-FILLED STEEL TUBE (CFST) KEY-CONNECTED PREFABRICATED WALL AND COLUMN. The Hong Kong Institute of Steel Construction, September 2020. http://dx.doi.org/10.18057/ijasc.2020.16.3.2.

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AXIAL COMPRESSION BEHAVIOR OF SQUARE THIN-WALLED CFST COLUMN TO RC BEAM JOINTS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.288.

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To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.
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