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Статті в журналах з теми "CFDST columns"

Автор: Grafiati

Опубліковано: 10 січня 2023

Оновлено: 28 січня 2023

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1

Simon, Ms Sandra Mariam, and Ms Anju Thulasi. "Non Linear Analysis on CFDST columns with and without GFRP Wrapping." International Journal for Research in Applied Science and Engineering Technology 10, no. 7 (July 31, 2022): 612–16. http://dx.doi.org/10.22214/ijraset.2022.45379.

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Анотація:

Abstract: Concrete Filled Double Skin Steel Tube (CFDST) columns are modified form of Concrete Filled Steel Tubular (CFST) columns, developed by several researchers. CFDST column composed of two concentric steel tubes in which concrete is packed in between them. It is available in various geometrical shapes. CFDST have many advantages such as high strength, high bending stiffness, good seismic and fire performance. But it is found that CFDST columns have some disadvantages including ageing of structures, corrosion of steel tubes etc. which reduces the strength of the column. So, to prevent these drawbacks and to strengthen the structure, Glass Fiber Reinforced Polymer (GFRP) can be used as an external cover. The present study aims to do nonlinear static analysis of CFDST columns having different hollow ratio wrapped with and without GFRP under axial compression using ANSYS finite element analysis software.

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2

Bhatia, Sakshi, and Aditya Kumar Tiwary. "Concrete Filled Double Skinned Tubular Columns Subjected to Different Loading Conditions." IOP Conference Series: Earth and Environmental Science 889, no. 1 (November 1, 2021): 012050. http://dx.doi.org/10.1088/1755-1315/889/1/012050.

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Анотація:

Abstract The meteoric growth in light weight structures have opened on doors to many revolutionary concepts and innovations. Studies have manifested that the lowered weight of the structures somehow help to fight the material cost with a better seismic performance. The hollow core structures aimed reducing the structural weight with an improved structural performance as well. The Concrete filled double steel tubes (CFDST) can be taken as amalgamation of Hollow core columns and CFST i.e. single skinned columns. The co-relation of CFST and Hollow core columns gave birth to Concrete filled double skinned tubular columns (CFDST) which can possess the advantages of both the concepts. A sedulous review of concrete filled double skinned columns is being conveyed through this article. The behavior of confined concrete as well as the confining inner and outer steel in the CFDST model and its overall structural behavior is being succinctly reviewed in this article and a simultaneous comparison of CFDST columns to solid concrete/conventional columns is also being carried out where required.

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3

Ci, Junchang, Mizan Ahmed, Viet-Linh Tran, Hong Jia, and Shicai Chen. "Axial compressive behavior of circular concrete-filled double steel tubular short columns." Advances in Structural Engineering 25, no. 2 (October 19, 2021): 259–76. http://dx.doi.org/10.1177/13694332211046345.

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Анотація:

This article investigates the axial compressive performance of concrete-filled double steel tubular (CFDST) short columns composed of circular section loaded concentrically. An experimental program comprised of compression tests on short columns is carried out to examine their structural performance. Axial compression tests on conventional concrete-filled steel tubular (CFST) columns and double-skin concrete-filled steel tubular (DCFST) columns are also performed for comparison purposes. The test parameters include the diameter-to-thickness of the outer and inner steel tubes, concrete strength, and diameter ratio. The test results exhibit that CFDST short columns composed of the circular section have improved structural performance compared to its CFST and DCFST counterparts. A theoretical model is also presented to simulate the test ultimate strengths and load-axial strain relationships of CFDST columns. The existing design models proposed including the codified design specifications are evaluated against the collected test data for predicting the axial compressive strengths of circular CFDST columns. It is seen that the existing codified design models cannot yield their ultimate axial compressive strengths accurately. A practical artificial neural network (ANN) model is proposed to estimate the ultimate load of such columns loaded concentrically.

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4

Manigandan, R., and Manoj Kumar. "Non-linear Analysis of Axially Loaded Octagonal CFDST Short Columns." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 435–42. http://dx.doi.org/10.38208/acp.v1.532.

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Анотація:

Concrete Filled Double-skin Steel Tube (CFDST) is a form of composite column that consists of outer steel and an inner steel tube and the space between them is filled with concrete. The structural response of CFDST columns is significantly affected by the thickness of outer and inner steel tubes and the compressive strength of infilled concrete. Although many studies have been in the past to understand the effect of inner and outer tubes thickness on the axial compressive response of circular CFDST columns, no such study appears in the context of octagonal CFDST columns. In this paper, the thickness of both inner and outer tubes is varied. Their effect on axial compressive behavior of CFDST columns containing the concrete of different grades is numerically examined. The non-linear FE analysis of CFDST columns is performed using the ABAQUS. The study shows that axial strength and ductility of octagonal section CFDST columns are significantly influenced by steel tube thickness and the grade of sandwiched concrete. Moreover, the study highlights the importance of the proper selection of inner and outer tube thickness for the better axial response of CFDST columns.

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5

Ci, Junchang, Mizan Ahmed, Hong Jia, Shicai Chen, Daxing Zhou, and Liqun Hou. "Experimental and numerical investigations of square concrete-filled double steel tubular stub columns." Advances in Structural Engineering 24, no. 11 (March 22, 2021): 2441–56. http://dx.doi.org/10.1177/13694332211004111.

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Анотація:

In this paper, the structural behavior of concrete-filled double steel tubular (CFDST) stub columns composed of square hollow sections is investigated experimentally and numerically. The experimental program comprises compression tests on short columns loaded concentrically. The test parameters mainly focused on the influences of the width-to-thickness ratios of steel tubes and concrete strength on the axial behavior of CFDST stub columns. Finite element (FE) models are also developed to investigate the influences of a wide range of structural parameters on their axial performance. It is observed that square CFDST columns have improved strength and ductility compared to their CFST and DCFST counterparts. Finally, a calculation formula is proposed to predict their ultimate compressive strengths under the axial compression load.

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6

Chen, Jing Yu, and Ying Hai. "Research on Bearing Capacity of Short Concrete Filled Double Skin Steel Tubes Columns under Axial Compression." Advanced Materials Research 168-170 (December 2010): 2154–57. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2154.

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Анотація:

The use of steel tube confined concrete columns has been the interests of many structural engineers. For investigation of the axially loading capacity of short concrete filled double skin tubes (CFDST) columns, axial compression loading experiments were carried on 9 short CFDST column samples. According to experimental results and with numerical analysis, an ultimate load estimation equation of CFDST column with one correction parameter is presented, the linear relation between the parameter and the inner-to-outer diameters ratio Di/Do is given out. The ultimate load estimation equation is validated by the test results of short CFDST column samples.

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7

Cui, Ying, Meimei Song, Zhan Qu, Shanshan Sun, and Junhai Zhao. "Research on Damage Assessment of Concrete-Filled Steel Tubular Column Subjected to Near-Field Blast Loading." Shock and Vibration 2020 (November 23, 2020): 1–19. http://dx.doi.org/10.1155/2020/8883711.

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Анотація:

Concrete-filled steel tubular (CFST) columns are widely used in engineering structures, and they have many different cross section types. Among these, normal solid sections and concrete-filled double-skin steel tubular sections are often used. Although many studies have been conducted on CFST columns with these two section types, no studies have been conducted on their damage assessment under blast loading. In this study, experimental analysis and a numerical simulation method were integrated to evaluate the responses and assess the damage of two concrete-filled steel tubular (CFST) columns with different cross sections subjected to near-field blast loading. The results showed that for a scaled distance of 0.14 m/kg1/3, plastic bending deformation occurred on the surfaces of the two CFST columns facing the explosive. The antiexplosion performance of the normal solid-section (NSS) CFST column was better than that of the concrete-filled double-skin steel tubular (CFDST) column. The explosion centre was set at the same height as the middle of column, and the distributions of the peak pressure values of the two columns were similar: the peak pressures at the middle points of the columns were the greatest, and the peak pressures at the bottom were higher than those at the top. With the analysis of the duration of the positive pressure, the damage at the middle was the most severe when subjected to blast loading. Using pressure-impulse damage theory and the validated numerical simulations, two pressure-impulse damage evaluation curves for NSS and CFDST columns were established separately by analysing the experimental and simulation data. Finally, based on the two pressure-impulse damage evaluation curves, the two pressure-impulse damage criteria for these two different fixed-end CFST columns were defined based on the deflection of the surfaces facing the explosives. Furthermore, the mathematical formulae for the two different column types were established to generate pressure-impulse diagrams. With the established formulae, the damage of the CFST columns with these two cross section types can be evaluated. Damage to other similar CFST columns with different cross section types due to near-field blast loading can also be evaluated by this method.

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8

Ahmed, Mizan, Qing Quan Liang, and Ahmed Hamoda. "Fiber element modeling of circular double-skin concrete-filled stainless-carbon steel tubular columns under axial load and bending." Advances in Structural Engineering 25, no. 5 (January 10, 2022): 1114–35. http://dx.doi.org/10.1177/13694332211065187.

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Анотація:

Circular concrete-filled double-skin steel tubular (CFDST) columns with external stainless-steel are high-performance composite columns that have potential applications in civil construction including the construction of offshore structures, bridge piers, and transmission towers. Reflecting the limited research performed on investigating their mechanical performance, this study develops a computationally efficient fiber model to simulate the responses of short and slender beam-columns accounting for the influences of material and geometric nonlinearities. Accurate material laws of stainless steel, carbon steel, and confined concrete are implemented in the mathematical modeling scheme developed. A new solution algorithm based on the Regula-Falsi method is developed to maintain the equilibrium condition. The independent test results of short and slender CFDST beam-column are utilized to validate the accuracy of the theoretical solutions. The influences of various column parameters are studied on the load-axial strain [Formula: see text] curves, load-lateral deflection [Formula: see text] curves, column strength curves, and interaction curves of CFDST columns. Design formulas are suggested for designing short and beam-columns and validated against the numerical results. The computational model is found to be capable of simulating the responses of CFDST short and slender columns reasonably well. Parametric studies show that the consideration of the concrete confinement is important for the accuracy of the prediction of their mechanical responses. Furthermore, high-strength concrete can be utilized to enhance their load-carrying capacity particularly for short and intermediate slender beam-columns. The strengths of CFDST columns computed by the suggested design model are in good agreement with the test and numerical results.

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9

Mohd Zuki, S. S., J. Jayaprakash, Shahiron Shahidan, and Ong Chong Yong. "Behavior of Fire Exposed Concrete-Filled Double Skin Steel Tubular (CFDST) Columns under Concentric Axial Loads." Applied Mechanics and Materials 773-774 (July 2015): 938–42. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.938.

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Анотація:

This paper presents the result of an experimental investigation of axial behavior of concrete-filled double skin steel tubular (CFDST) columns exposed to high temperature under the action of monotonically applied concentric axial loads. The columns were exposed to ASTM E-119 standard fire curve until 600°C and kept constant for two different exposure time (i.e., 60 and 90 minutes). Failure patterns and reduction in strength, ductility and stiffness of CFDST columns are reported. Factors influencing the strength, ductility and stiffness of CFDST columns during fire exposure, i.e., exposure time, temperature of concrete core and temperature of inner steel tube, are also discussed.

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10

İpek, S., and E. M. Güneyisi. "Ultimate Axial Strength of Concrete-Filled Double Skin Steel Tubular Column Sections." Advances in Civil Engineering 2019 (February 3, 2019): 1–19. http://dx.doi.org/10.1155/2019/6493037.

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Анотація:

This study aims at proposing a new model for evaluating the ultimate axial strength of concrete-filled double skin steel tubular (CFDST) composite columns. For this, a total of 103 experimental data regarding the ultimate strength of CFDST columns under axial loading were collected from the previous studies in the literature. All CFDST columns consist of two steel tubes being outer and inner circular hollow section. The model presented herein was developed by using gene expression programming. For this, the yield strength, diameter, and thickness of both outer and inner steel tubes, the compressive strength of annulus concrete, the length of the specimen, and the ultimate axial strength of the columns were utilized as the parameters. Assessment of the obtained results indicated that the generated model had a good performance compared to the existing models by the previous researchers and the equations specified in the design codes. The high value of R2 and narrow ranged fluctuation of the estimation error for the ultimate axial strength of the CFDST columns were also achieved through the proposed model.

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11

Hassooni, Anas Nahidh, and Salah R. Al-Zaidee. "Rehabilitation of Composite Column Subjected to Axial Load." Civil Engineering Journal 8, no. 3 (March 1, 2022): 595–611. http://dx.doi.org/10.28991/cej-2022-08-03-013.

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Анотація:

Concrete Filled Double Steel Tube (CFDST) columns are a modern technique of composite structural element that has fire resistance and has been adopted in high-rise building structures. The Concrete Filled Steel Tube (CFST) columns also have high strength and ductility due to composite action. This type of column CFST can sustain a heavy load with high performance and has been adopted in recent years in many countries around the world. The aim of the present work is to study the behavior and strength of rehabilitation of composite columns that are made from concrete core and surrounded steel tubes under the effect of axial compression loads with different height to diameter ratios such as 5.46, 10.91, and 16.37, respectively, by experimental tests. Double skin methodology is adopted to repair the damaged columns that were tested up to 85% of the ultimate load. Strength column capacity of double skin columns, axial and buckling deformations with axial and buckling strains are investigated. Test results showed that the repaired specimens up to 85% of the ultimate load had the same strength carrying capacity as compared with the control specimens, which had the same geometry. The ductility of an 800 mm specimen’s height is greater than the other tested specimens, while the stiffness of short specimens becomes high. Doi: 10.28991/CEJ-2022-08-03-013 Full Text: PDF

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12

Wang, Yan Ze, and Bai Shou Li. "Axial Behavior of Concrete-Filled Double Skin Steel Tubular Stub Columns Filled with Demolished Concrete Lump." Advanced Materials Research 898 (February 2014): 407–10. http://dx.doi.org/10.4028/www.scientific.net/amr.898.407.

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Анотація:

To analyze the axial compression bearing capacity of concrete filled double skin steel tubular (CFDST) stub columns which are filled with demolished concrete lump, twelve stub columns are tested. The main experimental parameters were the diameter-to-thickness ratio, mixing ratio and hollow section ration.Load-displacement curves and failure mode were analyzed, the compressive capacity determined from related design rules were compared with the peak load obtained in the tests. All specimens have a good performance of ductility and late bearing capacity. When the width-thickness is 72 and have a same mixing ratio, CFDST have the same bearing capacity with CFT. When the mixing ratio is 0 and width-thickness is 120, the bearing capacity of CFDST increase 16% than CFT. When the new concrete have similar compressive strength with old and mixing ratio is 25%, the bearing capacity of CFDST increase 18.8% than CFT.

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13

Wang, Yan Ze, and Bai Shou Li. "Axial Behavior of Concrete-Filled Double Skin Steel Tubular Stub Columns Filled with Demolished Concrete Lump." Applied Mechanics and Materials 556-562 (May 2014): 671–74. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.671.

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Анотація:

To analyze the axial compression bearing capacity of concrete filled double skin steel tubular (CFDST) stub columns which are filled with demolished concrete lump, twelve stub columns are tested. The main experimental parameters were the diameter-to-thickness ratio, mixing ratio and hollow section ration.Load-displacement curves and failure mode were analyzed, the compressive capacity determined from related design rules were compared with the peak load obtained in the tests. All specimens have a good performance of ductility and late bearing capacity. When the width-thickness is 72 and have a same mixing ratio, CFDST have the same bearing capacity with CFT. When the mixing ratio is 0 and width-thickness is 120, the bearing capacity of CFDST increase 16% than CFT. When the new concrete have similar compressive strength with old and mixing ratio is 25%, the bearing capacity of CFDST increase 18.8% than CFT.

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14

Chandramouli, Pavithra, Revathy Jayaseelan, Gajalakshmi Pandulu, Veerappan Sathish Kumar, Gunasekaran Murali, and Nikolai Ivanovich Vatin. "Estimating the Axial Compression Capacity of Concrete-Filled Double-Skin Tubular Columns with Metallic and Non-Metallic Composite Materials." Materials 15, no. 10 (May 16, 2022): 3567. http://dx.doi.org/10.3390/ma15103567.

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Анотація:

This research focuses on estimating the ACC (axial compression capacity) of concrete-filled double-skin tubular (CFDST) columns. The study utilised algorithms and ‘six’ evaluation methods (XGBoost, AdaBoost, Lasso, Ridge, Random Forest Regressor and artificial neural network (ANN) architecture-based regression) to study the empirical formulae and utilise the parameters as the research’s features, in order to find the best model that has higher and accurate reliability by using the RMSE and R2 scores as performance evaluation metrics. Thus, by identifying the best model in empirical formulae for estimating the ACC of CFDST, the research offers a reliable model for future research. Through findings, it was found that, out of the existing evaluation metrics, the ABR for AFRP, GFRP and Steel; RFR for CFRP; and RR for PETFRP were found to be the best models in the CFDST columns.

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15

Galarza, Fernando Palacios, and Joaquín H. Aquino Rocha. "Compressive Behaviour of Square CFDST Short Columns with Double Inner Steel Tubes." Key Engineering Materials 920 (May 16, 2022): 211–21. http://dx.doi.org/10.4028/p-j1w791.

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Анотація:

This study focuses on the experimental analysis of concrete-filled double-skin tubular (CFDST) short columns with double circular inner steel tubes under concentric axial loading. This cross-section layout promises to increase the ductile behavior of the compressive element and its energy absorption capacity, not to mention its ultimate axial strength. This research analyses main twofold variables: (i) Hollow ratio and (ii) eccentricity ratio (i.e., distance ratio between the inner tube’s separation and the sandwiched concrete width). As a result, load Vs. Axial deformation, load Vs. Axial strain curves, ductility index, strength index, energy absorption capacity, and ultimate axial capacity formulae for square CFDST columns with double circular inner tubes are reported. Key findings of this study show that (a) ductility is an intrinsic property of these types of sections; (b) the variation effect of hollow ratio influence inversely in the confined concrete strength of the element, (c) Eccentricity ratio has proved to be the least ultimate strength capacity influencer. However, its impact increases when it is jointly analyzed with the hollow ratio values. (d) The formulae proposed for predicting the ultimate capacity of CFDST columns showed good agreement with the experimental results. Thus, these expressions could be extended to the design of composite CFDST elements, provided a resistance factor based on a reliability analysis is incorporated.

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16

Farajpourbonab, Ebrahim. "Effective parameters on the behavior of CFDST columns." Istrazivanja i projektovanja za privredu 15, no. 1 (2017): 99–108. http://dx.doi.org/10.5937/jaes15-12474.

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17

Ganiga, Karthik N., Ibrahim Mahzeen, Mohammed Safan, Shaikh Fazil M U, and Shilpa S. "Blast Analysis on In-Filled Steel Tube Columns." International Journal for Modern Trends in Science and Technology 6, no. 6 (June 10, 2020): 50–53. http://dx.doi.org/10.46501/ijmtst060612.

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Анотація:

In recent years, a large number of studies have been carried out to investigate the behaviours of concrete filled double skin steel tube (CFDST) members due to its increasing popularity in the construction industry. This project aims to study on ultra-high performance concrete filled double-skin tubes subjected to blast loading with cross section being square for both inner and outer steel tubes using ANSYS software. It is evident that the proposed CFDST column was able to withstand a large blast load without failure so that it has the potential to be used in high-value buildings as well as critical infrastructures. The steel tubes and concrete work together well and integrity of steel concrete interface is maintained. Steel tubes in inner and outer can acts as permanent formwork and primary reinforcement. ANSYS results shows that the CFDA column can withstand applied blast load.

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18

He, Wen Hui, Chun Qiang Yang, Yuan Ye Yi, Zhi Han Tang, Peng Chen He, and Hai Bing Weng. "Analytical Investigation on Concrete Filled Double-Skinned Steel Tubular Column Composite Frame with Bolted End-Plate Connections." Advanced Materials Research 639-640 (January 2013): 220–24. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.220.

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Анотація:

Simulation studies of seismic behaviour of bolt-endplate connected composite structural systems consisting of CFDST columns and steel beams frame with reinforced concrete slabs are presented in this paper. Based on fiber-section model, analytical models were developed to predict the elastic-to-plastic behaviour of the prototype frame. Analysis results indicated that the structural behaviour under the simulated seismic loadings was consistent with the expected performance objects for different earthquake hazard levels corresponding to current seismic design codes, implying that effective seismic performance of composite CFDST frame with bolted connections can be achieved. The primary analytical simulation shows the suggested bolted endplate CFDST system has the potential to offer appropriate strength and adequate stiffness for buildings located in areas of high earthquake intensity, and provides basic information for further experimental researches to validate the seismic performances of the bolted end-plate CFDST structures.

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19

Mohd Zuki, S. S., Kok Keong Choong, J. Jayaprakash, and Shahiron Shahidan. "Effect of Diameter on Fire Exposed Concrete-Filled Double Skin Steel Tubular (CFDST) Columns under Concentric Axial Loads." Applied Mechanics and Materials 802 (October 2015): 130–35. http://dx.doi.org/10.4028/www.scientific.net/amm.802.130.

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Анотація:

Concrete-filled double skin steel tubular (CFDST) columns with three different diameters were exposed to fire following ASTM E-119 fire curve. The temperature was kept constant for 60 minutes after reaching 600°C. After the cooling down process, the columns were tested under concentric axial load condition until failure. Maximum loads, displacement and strain were recorded during testing. Failure patterns were observed. In this paper, failure patterns, increment or reduction of residual strength, ductility and stiffness are reported and discussed in details. All tested CFDST columns failed by local buckling and crushing of concrete. As expected, residual strength index (RSI) decreased with increased fire exposure time. Whereas, larger diameter heated specimen retain more than 50% of it corresponding room temperature secant stiffness. In addition, ductility index (DI) of larger diameter specimen shows an enhancement after fire exposure. Highest enhancement in DI was observed in 90 minutes fire exposure.

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20

Zhao, Xiao-Ling, Le-Wei Tong, and Xing-Yi Wang. "CFDST stub columns subjected to large deformation axial loading." Engineering Structures 32, no. 3 (March 2010): 692–703. http://dx.doi.org/10.1016/j.engstruct.2009.11.015.

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21

Wang, Xiannong, Nannan Wang, and Boya Jia. "Experimental research of seismic behavior and surplus bearing capacity of CFDST under reversed loading." World Journal of Engineering 11, no. 3 (June 1, 2014): 257–64. http://dx.doi.org/10.1260/1708-5284.11.3.257.

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Анотація:

The concrete-filled double skin steel tubes (CFDST) column is a new type of steel composite structure column. At present, international and domestic research are still lacking in regards to this composite structure column. Therefore, a study of the composite structure column would have great theoretical and practical significance. In this paper, an experiment using concrete-filled double skin steel tubes columns with square-circular section is conducted under repeated loading and then under static axial compression. The test results show that the new type of composite structure column has excellent ductility and relatively good surplus bearing capacity. So, the test has laid a certain foundation for doing analysis and study on the new type of composite structure column in the future.

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22

Farajpourbonab, Ebrahim, and Amin Rafieioskoei. "BEHAVIOR OF CFDST COLUMNS WITH OCTAGON AND POLYGON STEEL SECTIONS." Journal of Urban and Environmental Engineering 12, no. 2 (December 31, 2018): 236–44. http://dx.doi.org/10.4090/juee.2018.v12n2.236244.

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23

Mohammadbagheri, S., and B. Shekastehband. "Fire resistance of stiffened CFDST columns after earthquake-induced damages." Thin-Walled Structures 154 (September 2020): 106865. http://dx.doi.org/10.1016/j.tws.2020.106865.

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24

Li, Wei, Lin-Hai Han, Qing-Xin Ren, and Xiao-Ling Zhao. "Behavior and calculation of tapered CFDST columns under eccentric compression." Journal of Constructional Steel Research 83 (April 2013): 127–36. http://dx.doi.org/10.1016/j.jcsr.2013.01.010.

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25

T, Sreelakshmi, and Divya K K. "Study on Axial Load Carrying Capacity of Concrete-Filled Double Skin Slender Waist-Shaped Stub Column." International Journal for Research in Applied Science and Engineering Technology 10, no. 6 (June 30, 2022): 4915–19. http://dx.doi.org/10.22214/ijraset.2022.45114.

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Анотація:

Abstract: In the present scenario, concrete-filled steel tubular members have become very popular in the construction industry. These types of members utilize both the advantages of steel and concrete such as the high strength and ductility of steel and the high strength and stiffness of concrete. In the present concrete-filled double skin slender waist-shaped column is used. These columns are composed of two steel tubes such that they are arranged in a concentric configuration with concrete sandwiched between them. It has the ability to impart equal or superior characteristics when compared to traditional concrete-filled steel tubular columns. The finite element method using ANSYS software is used for the study. In this work, the nonlinear structural behavior of CFDST columns is investigated by varying the cross-sectional shapes of steel tubes used. Various parameters that can be evaluated from this study are stress, strain, and deformation values. Comparative results of values of these parameters are obtained.

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26

Bai, Wen, Yunhao Li, Jing Ji, Yuchen Liu, Lei Zhang, Ruili Wang, Liangqin Jiang, and Lingjie He. "Axial Compression Behavior of Symmetrical Full-Scale Concrete Filled Double Skin Steel Tube Stub Columns." Symmetry 14, no. 2 (January 24, 2022): 223. http://dx.doi.org/10.3390/sym14020223.

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Анотація:

To investigate the bearing behavior of symmetrical full-scale different strength concrete filled double skin steel tube (CFDST) stub columns, 19 full-scale specimens were designed, considering the slenderness ratio (λ); the compression strength of core concrete and sandwich concrete (fcki, fcko), the thickness of the inner and outer steel tubes (ti, to); the diameter of inner and outer steel tubes (Di, Do); and the tensile strength of the inner and outer steel tubes (fyki, fyko) as the main parameters. Nonlinear constitutive models for concrete considering constraint effect were adopted, and a finite element (FE) model was established using ABAQUS software. By comparing the results between simulations and experiments, the rationality of the modeling method was verified. Based on the FE model, the parameter analysis for CFDST columns were conducted, and the force mechanism, stress distribution, and deformation process were analyzed. The results showed that the axial compression bearing capacity (Nsu) increased significantly with an increase in fcki, to, Do, and fcko, while Nsu decreased gradually with an increase in λ. Finally, according to the calculated results of the specimens, the calculation formula for Nsu of full-scale composite columns was statistically regressed using 1stOpt software and showed a good agreement with the FE.

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27

Wang, Yan Ze, and Bai Shou Li. "Finite Element Analysis for Concrete Filled Double-Skin Steel Tubular Stub Columns." Advanced Materials Research 690-693 (May 2013): 696–99. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.696.

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Анотація:

To realize axial load behavior of CFDST, ANSYS is used to analyze the process from load to destruction that hollow section ratio is the main variable parameter. To explore the validity of finite element analysis software, axial compressive strength is calculated combined with formulas of existing criterions. The results show the finite element results have a good agreement with text values and calculation.

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28

Yang, You-Fu, Feng Fu, Xue-Meng Bie, and Xiang-He Dai. "Axial compressive behaviour of CFDST stub columns with large void ratio." Journal of Constructional Steel Research 186 (November 2021): 106892. http://dx.doi.org/10.1016/j.jcsr.2021.106892.

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29

Schnabl, Simon, and Bojan Čas. "Buckling of circular CFDST slender columns with compliant interfaces: exact solution." Journal of Mechanics of Materials and Structures 15, no. 4 (October 19, 2020): 499–509. http://dx.doi.org/10.2140/jomms.2020.15.499.

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30

Ho, J. C. M., and C. X. Dong. "Improving strength, stiffness and ductility of CFDST columns by external confinement." Thin-Walled Structures 75 (February 2014): 18–29. http://dx.doi.org/10.1016/j.tws.2013.10.009.

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31

Elchalakani, M., V. I. Patel, A. Karrech, M. F. Hassanein, S. Fawzia, and B. Yang. "Finite element simulation of circular short CFDST columns under axial compression." Structures 20 (August 2019): 607–19. http://dx.doi.org/10.1016/j.istruc.2019.06.004.

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32

Zhang, Yong-Bo, Lin-Hai Han, and Wei Li. "Analytical behaviour of tapered CFDST stub columns under axially partial compression." Journal of Constructional Steel Research 139 (December 2017): 302–14. http://dx.doi.org/10.1016/j.jcsr.2017.09.023.

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33

Deng, Ran, Xu-Hong Zhou, Yu-Hang Wang, Ke Ke, Jiu-Lin Bai, and Rong-Hua Zhu. "Behaviour of tapered CFDST columns with large hollow ratio under combined loads." Journal of Constructional Steel Research 196 (September 2022): 107388. http://dx.doi.org/10.1016/j.jcsr.2022.107388.

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34

Shi, Yan-Li, Sun-Hang Ji, Wen-Da Wang, Wei Xian, and Jia-Hao Fan. "Axial compressive behaviour of tapered CFDST stub columns with large void ratio." Journal of Constructional Steel Research 191 (April 2022): 107206. http://dx.doi.org/10.1016/j.jcsr.2022.107206.

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35

Su, Rong, Xian Li, Tao Zhong, and Tao Zhou. "Axial behavior of novel CFDST columns with outer welded corrugated steel tubes." Structures 34 (December 2021): 2708–20. http://dx.doi.org/10.1016/j.istruc.2021.09.039.

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36

Hasan, Hussein Ghanim, and Talha Ekmekyapar. "Bond-slip behaviour of concrete filled double skin steel tubular (CFDST) columns." Marine Structures 79 (September 2021): 103061. http://dx.doi.org/10.1016/j.marstruc.2021.103061.

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37

Li, Wei, Qing-Xin Ren, Lin-Hai Han, and Xiao-Ling Zhao. "Behaviour of tapered concrete-filled double skin steel tubular (CFDST) stub columns." Thin-Walled Structures 57 (August 2012): 37–48. http://dx.doi.org/10.1016/j.tws.2012.03.019.

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38

Fang, Yong, Yuyin Wang, Chao Hou, and Bo Lu. "CFDST stub columns with galvanized corrugated steel tubes: Concept and axial behaviour." Thin-Walled Structures 157 (December 2020): 107116. http://dx.doi.org/10.1016/j.tws.2020.107116.

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39

Li, Wei, Lin-Hai Han, and Xiao-Ling Zhao. "Behavior of CFDST stub columns under preload, sustained load and chloride corrosion." Journal of Constructional Steel Research 107 (April 2015): 12–23. http://dx.doi.org/10.1016/j.jcsr.2014.12.023.

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40

Uenaka, Kojiro. "CFDST stub columns having outer circular and inner square sections under compression." Journal of Constructional Steel Research 120 (April 2016): 1–7. http://dx.doi.org/10.1016/j.jcsr.2015.12.005.

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41

Guo, Lei, Jingfeng Wang, Wanqian Wang, and Chenggang Wang. "Cyclic tests and analyses of extended endplate composite connections to CFDST columns." Journal of Constructional Steel Research 167 (April 2020): 105937. http://dx.doi.org/10.1016/j.jcsr.2020.105937.

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42

Huang, Hong, Lin-Hai Han, Zhong Tao, and Xiao-Ling Zhao. "Analytical behaviour of concrete-filled double skin steel tubular (CFDST) stub columns." Journal of Constructional Steel Research 66, no. 4 (April 2010): 542–55. http://dx.doi.org/10.1016/j.jcsr.2009.09.014.

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43

Dong, C. X., and J. C. M. Ho. "Uni-axial behaviour of normal-strength CFDST columns with external steel rings." Steel & Composite structures 13, no. 6 (December 25, 2012): 587–606. http://dx.doi.org/10.12989/scs.2012.13.6.587.

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44

Yan, Xi-Feng, Yan-Gang Zhao, and Siqi Lin. "Compressive behaviour of circular CFDST short columns with high- and ultrahigh-strength concrete." Thin-Walled Structures 164 (July 2021): 107898. http://dx.doi.org/10.1016/j.tws.2021.107898.

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45

Li, Wei, and Yu-Xiao Cai. "Performance of CFDST stub columns using high-strength steel subjected to axial compression." Thin-Walled Structures 141 (August 2019): 411–22. http://dx.doi.org/10.1016/j.tws.2019.04.021.

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46

Zhao, Hui, Rui Wang, Dennis Lam, Chuan-Chuan Hou, and Rong Zhang. "Behaviours of circular CFDST with stainless steel external tube: Slender columns and beams." Thin-Walled Structures 158 (January 2021): 107172. http://dx.doi.org/10.1016/j.tws.2020.107172.

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47

Li, Minghong, Zhouhong Zong, Hong Hao, Xihong Zhang, Jin Lin, and Yuchen Liao. "Post-blast performance and residual capacity of CFDST columns subjected to contact explosions." Journal of Constructional Steel Research 167 (April 2020): 105960. http://dx.doi.org/10.1016/j.jcsr.2020.105960.

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48

Zhang, Fangrui, Chengqing Wu, Xiao-Ling Zhao, Hengbo Xiang, Zhong-Xian Li, Qin Fang, Zhongxian Liu, Yadong Zhang, Amin Heidarpour, and Jeffrey A. Packer. "Experimental study of CFDST columns infilled with UHPC under close-range blast loading." International Journal of Impact Engineering 93 (July 2016): 184–95. http://dx.doi.org/10.1016/j.ijimpeng.2016.01.011.

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49

Han, Lin-Hai, Hong Huang, Zhong Tao, and Xiao-Ling Zhao. "Concrete-filled double skin steel tubular (CFDST) beam–columns subjected to cyclic bending." Engineering Structures 28, no. 12 (October 2006): 1698–714. http://dx.doi.org/10.1016/j.engstruct.2006.03.004.

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50

Yan, Xi-Feng, and Yan-Gang Zhao. "Experimental and numerical studies of circular sandwiched concrete axially loaded CFDST short columns." Engineering Structures 230 (March 2021): 111617. http://dx.doi.org/10.1016/j.engstruct.2020.111617.

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