Готові списки джерел за темами / Portal frame method

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Добірка наукової літератури з теми "Portal frame method"

Автор: Grafiati

Опубліковано: 7 червня 2025

Оновлено: 2 серпня 2025

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Статті в журналах з теми "Portal frame method"

R., H. Mohankar*, Imran Alam Md., Gaurav Gopesh, and Choudhary Shubham. "A STUDY OF PORTAL FRAME USING ANALYTICAL METHODS AND ETABS SOFTWARE." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 3 (2016): 835–40. https://doi.org/10.5281/zenodo.48372.

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Анотація:

Analysis of portal frames involves lot of complications and tedious calculations by conventional methods. To carry out such analysis is a time consuming task. The Moment Distribution Method & Slope Deflection Method for analysis of portal frames can be handy in approximate and quick analysis so as to get the detailed estimates ready. In this work, these two methods have been applied only for vertical loading conditions. This paper mainly deals with the comparative analysis of the results obtained from the analysis of single bay portal frame when analyzed manually and using ETABS Software s

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Chen, Xu, and Hui Min Li. "The Alculation Method of Stable Bearing Capacity of Portal Frame." Applied Mechanics and Materials 351-352 (August 2013): 329–36. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.329.

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In recent years, the portal frame structure in the actual project has been widely used, but using the finite element method calculation of stable bearing capacity of portal frame is more complex, and very difficult to the design and construction personnel. With the known stability of the cantilever column carrying capacity and the vertex of the lateral displacement under concentrated force, the establishment of the ratio of the portal frame stability capacity and the stability of the cantilever column carrying capacity both in the same concentrated force vertex lateral displacement than the re

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Faridmehr, Iman, Mahmood Md Tahir, Tom Lahmer, and Mohd Hanim Osman. "Seismic Performance of Steel Frames with Semirigid Connections." Journal of Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/5284247.

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The nonlinear stiffness matrix method was incorporated to investigate the structural performance of steel portal frames with semirigid connections. A portal frame with unstiffened extended end-plate connection was designed to demonstrate the adequacy of the proposed method. Besides, the seismic performance of steel portal frames with semirigid connections was investigated through time history analysis where kinematic hysteresis model was assigned to semirigid connections to account for energy dissipation and unloading stiffness. Based on the results of the study, it was found that generally se

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BASAGA, H. B., M. E. KARTAL, and A. BAYRAKTAR. "RELIABILITY ANALYSIS OF STEEL BRACED REINFORCED CONCRETE FRAMES WITH SEMI-RIGID CONNECTIONS." International Journal of Structural Stability and Dynamics 12, no. 05 (2012): 1250037. http://dx.doi.org/10.1142/s021945541250037x.

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This paper presents the reliability analysis of the frame structures with semi-rigid connections. For this purpose, the SEMIFEM finite element program that is capable of dealing with the semi-rigid connections is coded in FORTRAN. Then, this program is connected to the reliability algorithm. The direct coupling method, which is a combination of the reliability method and finite element method, is utilized to determine the reliability indexes and probabilities of failure for the structure. The first order reliability method (FORM) is the one favored in the present reliability analysis. Two sets

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Far, Harry, and Claire Far. "Timber Portal Frames vs Timber Truss-Based Systems for Residential Buildings." Advances in Civil Engineering 2019 (July 28, 2019): 1–7. http://dx.doi.org/10.1155/2019/9047679.

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Анотація:

A large number of structures have been built during or after the construction of a house or residential-zoned building, which are not built at the same time and/or integrally with the structural integrity of the residential dwelling. These include carports, pergolas, sheds, and barns. The typical method of constructing these structures is a general timber truss and column system. The aim of this study is to look at the feasibility and economic incentive that may be gained from using a timber portal frame system, similar to the steel or timber portal frames used for larger industrial constructi

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Liu, Feng, and Xiao Yan Wang. "Overall Reliability Assessment of Portal Frame Structure with Roof Beam Outward Offset." Applied Mechanics and Materials 501-504 (January 2014): 628–33. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.628.

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This article deals with the condition that the roof beams of portal frame are outward offset beyond the standard limit, determines the most unfavorable position of the portal frame structure under the load and establishes the criterion standard of structural failure based on the space overall finite element analysis. It adopts Monte-Carlo method in reliability analysis methods to realize the overall reliability analysis of the portal frame structure with the roof beam outward offset. Analysis shows that the actual structure is at safe state under the design load and the reliability conforms to

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Xie, Ming, Fangbo Xu, Zhangdong Wang, et al. "Investigating Fire Collapse Early Warning Systems for Portal Frames." Buildings 15, no. 2 (2025): 296. https://doi.org/10.3390/buildings15020296.

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Анотація:

In recent years, firefighter accidents and people injured by the collapse of steel structures during a fire have occurred frequently, which has attracted the attention of the National Emergency Management Department and the Fire and Rescue Bureau. It is urgent to carry out research on early warning systems for building collapse during a fire. Existing early warning methods mainly use characteristic parameters such as temperature, vibration, and structural deformation. Due to the complexity of an actual fire, it is difficult to accurately predict the critical temperature of fire−induced instabi

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Jia, Wen Wen, and Deng Feng Wang. "Internal Force Evaluation of Non-Uniform Beam in Portal Frame." Applied Mechanics and Materials 423-426 (September 2013): 1454–58. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1454.

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To simplify the internal force evaluation of portal frame being composed of non-uniform members, the force method was used to solve internal force of every key section of the non-uniform beam in portal frame with single-span. Gauss numerical integration method was used to simplify the complex integration when the deformation energy was calculated. Under the precondition of satisfied accuracy, the direct expressions of bending momentshear force and axial force of every key section of beam were obtained. The research work can be used as reference for the evaluation and design of portal frame mem

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Sabbagh-Yazdi, Saeed-Reza, and Ainullah Mirzazadah. "Comparing Numerical Results for Seismic Performance of Portal Steel Frames Braced with Steel: HSS Brace, Glulam Timber Brace, and Timber-Steel-BRB." Advances in Civil Engineering 2022 (July 20, 2022): 1–17. http://dx.doi.org/10.1155/2022/2705691.

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This study involves the application of timber-based bracings elements. For this purpose, seismic analyses are performed on special portal steel frames without the brace and diagonally braced with Glued Laminated Timber (glulam) and Timber-Steel Buckling Restrained Brace (TS-BRB), and the results are compared with the same configuration using steel Hollow Structural Sections (HSS) bracing, using OpenSees structural analyzer. First, to verify the accuracy of the modeling, the numerical results are compared with experimental measurements on several types of elements: (a) diagonally braced frame w

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S. J. Modak, S. J. Modak. "Determination of Influence Lines of a Portal Frame Adopting Matrix Method of Structural Analysis." Indian Journal of Applied Research 3, no. 7 (2011): 224–26. http://dx.doi.org/10.15373/2249555x/july2013/70.

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Дисертації з теми "Portal frame method"

Park, Ashley Yuuki. "Semi-rigid joints to tubular columns and their use in semi-continuous frame design." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/semirigid-joints-to-tubular-columns-and-their-use-in-semicontinuous-frame-design(5214b6d8-7df6-4197-bbcd-d4d92b8330df).html.

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Traditionally, joints are assumed to be either pinned or fully rigid, but in reality, many behave between these two extremes giving them a semi-rigid classification. By acknowledging the semi-rigidity of nominal pin joints, steel frames can be designed as semi-continuous in which the beam bending moments are partially transmitted to the column members and the need for lateral bracing is eliminated, thus reducing material and construction costs. This thesis presents the results of numerical and theoretical studies of the behaviour of bolted endplate connections to Rectangular Hollow Section (RH

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Chen, Lu. "Robustness in fire of steel framed structures with realistic connections." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/robustness-in-fire-of-steel-framed-structures-with-realistic-connections(fcf4d94b-56f4-42bc-b20a-e2e497d4c14a).html.

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Joints are the most critical elements in a steel framed structure. In most design guides or codes, the joints are assumed to a have higher fire resistance than the connected structural members because of the lower temperatures in the joints. However, in severe fire conditions, a connected beam's temperature may be higher than its limiting temperature and the beam may develop catenary action when the beam’s axial shortening from large deflections becomes greater than the beam’s thermal expansion. This beam catenary action force could fracture the joints, increasing the risk of progressive colla

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Nguyen, Hoai Cuong. "Strength and Behaviour of Cold-Rolled Aluminium Portal Frames." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25465.

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This doctoral thesis presents a comprehensive study on cold-rolled aluminium portal frames composed of back-to-back lipped channel sections. The research included an extensive experimental program on full-scale portal frames and components, a numerical simulation part on finite element modelling, and finally a proposal development of the design for the cold-rolled aluminium frame systems. The primary aim is to explore the structural behaviour and ultimate strength through experiments and numerical analyses, leading to the development of proposed provisions for the design of cold-rolled alumini

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Rinchen. "Long-span cold-formed steel single C-section portal frames." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18882.

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This thesis presents a comprehensive study of long-span cold-formed steel single C-section portal frames. The study includes the formulation of a nonlinear beam finite element for thin-walled sections, a series of full-scale frame tests and component tests, finite element modelling and advanced analysis followed by the formulation of design guidelines. The study was aimed at exploring the structural behaviour through experiment and numerical analysis towards developing provisions for the design of cold-formed steel portal frames using Advanced Analysis. A nonlinear thin-walled beam element for

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Blum, Hannah Beth. "Long-Span Cold-Formed Steel Double Channel Portal Frames." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16290.

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A comprehensive study on long-span cold-formed steel portal frames composed of back-to-back channel sections is presented. The aim of the study is to determine appropriate design guidelines in order for engineers to safely and efficiently build larger frames. The system analyzed herein is a haunched portal frame with a knee brace connected between the column and rafter. The objectives of the research were achieved through an extensive experimental study as well as numerical investigations. A comprehensive experimental program was completed to determine the strength and behavior of the frames.

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Lee, Seungjea. "Robustness of reinforced concrete framed building at elevated temperatures." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/robustness-of-reinforced-concrete-framed-building-at-elevated-temperatures(db90ad82-86b5-4ba3-9ef1-42e7004b4b34).html.

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This thesis presents the results of a research programme to investigate the behaviour and robustness of reinforced concrete (RC) frames in fire. The research was carried out through numerical simulations using the commercial finite element analysis package TNO DIANA. The main focus of the project is the large deflection behaviour of restrained reinforced concrete beams, in particular the development of catenary action, because this behaviour is the most important factor that influences the frame response under accidental loading. This research includes four main parts as follows: (1) validatio

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Athanasios, Dimitriou. "Surface pre-treatment methods for improving adhesion ability in wood plymer composite for frame and furniture construction applications." Thesis, Bangor University, 2015. https://research.bangor.ac.uk/portal/en/theses/surface-pretreatment-methods-for-improving-adhesion-ability-in-wood-plymer-composite-for-frame-and-furniture-construction-applications(0e7da265-4f1a-4506-aad1-f3e84105aff1).html.

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Kulkarni, Raghavendra B. "Inverse problems solution using spectral finite element methods." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5471.

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Анотація:

Inverse problems are very challenging as these problems involve, finding the cause by analyzing the effects. In structural dynamics problems, the effects are normally measured in terms of dynamic responses in structures. These responses which are used to find the cause generally have partial data, embedded with measurement noise, and are truncated. Due to these problems, inverse problems are generally ill-posed in most cases as against forward problems. In this dissertation, we solve five different types of inverse problems involving high-frequency transient loads. All these problems are sol

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Книги з теми "Portal frame method"

Wan, Chi-Wah. Optimum design of a simple portal frame using risk analysis method. 1985.

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Park, Simon. Poets, Patronage, and Print in Sixteenth-Century Portugal. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192896384.001.0001.

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Portugal was not always the best place for poets in the sixteenth century. Against the backdrop of an expanding empire, poets struggled to articulate their worth to rulers and patrons. Many of their works considered what poetry could do and what its value was. The answers that poets like Luís de Camões, Francisco de Sá de Miranda, António Ferreira, and Diogo Bernardes offered to these questions ranged from lofty ideals to more practical concerns of making ends meet. This book articulates a ‘pragmatics of poetry’ that combines literary analysis and book history with methods from sociology to ex

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Частини книг з теми "Portal frame method"

Dong, Pool Ip. "13. Children’s Emerging Play and Experience in the Covid-19 Era." In Play in a Covid Frame. Open Book Publishers, 2023. http://dx.doi.org/10.11647/obp.0326.13.

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This chapter examines diverse distance education strategies used in Korean early childhood education and care (ECEC). Focused on the Covid-19 situation in the South Korean educational context, it introduces how Korean teachers and parents made an effort to promote and provide opportunities for children’s play. Examples of this include teachers sending ‘A Package for Play’, using education portals and providing distance education through media (e.g. real-time interactive learning via Zoom and content-based learning via TV programmes). This chapter also analyzes how young children, teachers, par

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Klötzer, Christian, Martin-Christoph Wanner, Wilko Flügge, and Lars Greitsch. "Implementation of Innovative Manufacturing Technologies in Foundries for Large-Volume Components." In Annals of Scientific Society for Assembly, Handling and Industrial Robotics 2021. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-74032-0_19.

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AbstractThe development of new manufacturing technologies opens up new perspectives for the production of propellers (diameter < 5 m), especially since the use of the established sand casting process as a technology is only partially competitive in today’s market. Therefore, different applications of generative manufacturing methods for the implementation into the production process were investigated. One approach is the mould production using additive manufacturing processes. Investigations showed that especially for large components with high wall thicknesses available systems and process

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Lin, Huhu, Qian Liu, and Siwen Liu. "Toward Moire-Free Video: A Multi-Scale Feature Alignment and Removal Network." In Advances in Transdisciplinary Engineering. IOS Press, 2024. http://dx.doi.org/10.3233/atde240468.

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The widespread adoption of portable photography devices, such as smartphones, has led to an increased occurrence of moire patterns on camera screens, which significantly degrades the quality of visual perception. While most research has focused on the removal of moire patterns in images, video moire removal has not been well investigated. This paper focus on the removal of moire patterns in videos and propose a two-stage video moire removal network. The first stage aligns the information between adjacent frames through a multi-scale frame alignment network, accomplishing the temporal aggregati

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Marti-Puig Pere, Masferrer Gerard, and Serra Moises. "Low-complex Real-Time Breathing Monitoring System for Smartphones." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2014. https://doi.org/10.3233/978-1-61499-452-7-257.

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Monitoring breathing is required in many applications of medical and health fields but it can also be used also in a new set of applications that involve fields as diverse as entertainment games or some new applications oriented to develop skills such as focused attention. As smartphones are widespread around the world it is assumed that an important number of such applications must run on such platforms. In this work, an automatic, low-complex real-time system for monitoring breathing is presented. The system uses the acoustic signal recorded by a standard microphone placed in the area of the

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Тези доповідей конференцій з теми "Portal frame method"

Gottsäter, Erik, Oskar Larsson, Mario Plos, Miklós Molnár, and Roberto Crocetti. "Simulation of Thermal Load Distribution in Portal Frame Bridges." In IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. International Association for Bridge and Structural Engineering (IABSE), 2016. http://dx.doi.org/10.2749/stockholm.2016.0009.

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Uneven exposure to e.g. solar radiation can cause temperature differences between various structural parts of a bridge, which leads to tensile stresses if the parts cannot move freely. In this study, thermal simulations and stress calculations on a model of a portal frame bridge are performed with the aim of evaluating the temperature difference between the bridge parts. It is shown that the temperature difference between parts which is proposed by Eurocode 1 is overestimated, thus the resulting stress distribution being unrealistic. Using the design method proposed by Eurocode 1 is therefore

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Yin, T., L. Yu, and H. P. Zhu. "Structural Damage Identification Based on Model Updating." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95691.

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This paper presents a new method for structural damage identification based on the finite element (FE) model updating techniques. First, an objective function is defined as minimizing the sum of differences between the experimental and analytical modal data (natural frequencies and mode shapes), which is set as a nonlinear least-squares problem with bound-constrains. The trust-region approach is then used to solve the minimization problem in order to make this optimization process more robust and reliable. In addition, the expansion and weighting of the original objective function are investig

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Leamy, Michael J. "Wave Based Analysis of Buckling in Columns and Frames." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12926.

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This paper reports a wave-based analysis approach for predicting static buckling instabilities in axially-loaded columns and frames. It builds upon recent work on the wave-based vibration analysis of frame-like structures modeled by Timoshenko beams. To predict buckling, axial preload modeling is included in the equations of motion and the wave-based analysis approach is reformulated accordingly. This reformulation includes development of reflection and transmission matrices for a general, four-member angled joint. An eigenvalue problem (EVP) is then solved for example systems by setting the f

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Chornay, Morn, and Xin Zhao. "Multilevel Decomposition Model for Optimal Design of Multi-Story Structures." In IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation. International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/nanjing.2022.0216.

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<p>Multilevel decomposition optimization method decomposes a large problem into small subproblems to be solved separately and maintain effects between subproblems effectively by sensitivity derivatives, and it serves as a useful tool for design engineer team to work on a large structural optimization problem simultaneously and effectively. The present paper illustrates the application of this method on the optimization of a portal frame of a multi-story steel structure, and three level of substructure is chosen to solve the optimization problem. The 1st level is the entire structural sys

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KAMAL, MAYANK, and SAUVIK BANERJEE. "VIBRATION BASED DAMAGE IDENTIFICATION IN WELDED ASYMMETRICAL STEEL FRAMES USING REGULARIZATION TECHNIQUES." In Structural Health Monitoring 2023. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/shm2023/36811.

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The damage identification problem for a frame structure can be formulated in a linear equation in the form Aθ = b. In this formulation, matrix A represents the FE model parameters, vector θ represents the change in state variables or the mathematical parameters which are to be determined, and vector b represents the response to an external excitation. In the real test case, the matrix A can be rectangular, and the linear relation is an over-determined and ill-posed problem. The results of these ill-posed problems are non-continuous and thus require special solution techniques like regularizati

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Srirengan, Kanthi, Partha Chakrabarti, and Rupak Ghosh. "Modal Superposition Technique to Predict the Seismic-Pushover Load for Jacket-Type Structures." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28258.

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Two novel methods namely the Dominant Modes method and the All Modes method to predict the seismic-pushover load for the jacket-type structures are presented. Both of these methods are based on the linear superposition of the modal reactions. As a preliminary evaluation, the linear elastic response of a jacket structure subjected to seismic-pushover loads is compared with that obtained from the response spectrum analysis. Furthermore, the nonlinear inelastic behavior obtained from the seismic-pushover analysis is compared with that obtained from the nonlinear time-history analysis, for a porta

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Rocha, Rodrigo T., Jose M. Balthazar, Angelo M. Tusset, Vinicius Piccirillo, Frederic C. Janzen, and Jorge L. P. Felix. "On Mode Coupling Analysis and Stability Regions to Energy Harvesting in a Two-Degrees-of-Freedom Portal Frame Platform." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67532.

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This work aims to study the modal coupling of a nonlinear two-degrees-of-freedom portal frame platform and a numerical analysis of the system with a nonlinear piezoelectric (PZT) material coupled to one of its columns, both externally base-excited. The nonlinear platform possesses two-to-one internal resonance between its two vibration modes and presenting the saturation phenomenon. The nonlinearities of the piezoelectric material are considered by a nonlinear mathematical relation. Here, it is considered an electro-dynamical shaker with harmonic output. The employed methodology to carry out t

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Yu, L., T. Yin, and H. P. Zhu. "Statistics-Based Noise Analysis for Vibration-Based Damage Identification." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95673.

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As the vibration-based structural damage detection methods are easily affected by the environmental noise, a novel noise analysis method is proposed based on the statistics in this paper together with the Monte Carlo technique for assessing the influence of experimental noise of modal data on sensitivity-based damage detection methods. Different from the commonly used random perturbation technique, the proposed technique is deduced directly by the Moore–Penrose generalized inverse of sensitivity matrix under the differential quotient rule of composite function. It can not only make the analysi

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Gottsäter, Erik, Oskar Larsson Ivanov, and Mario Plos. "Crack widths in portal frame bridges subjected to restraint effects." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1100.

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<p>Restraint stresses appear in structural parts which are prevented from adjusting their shape when subjected to e.g. shrinkage or thermal actions. If the restrained stresses are large, cracking might occur, which can affect the durability of the structure. In the case of restraint effects, the reinforcement required in a bridge to limit the crack widths can be difficult to determine, as the magnitude of the restraint stresses depend on the stiffness of the structure. If cracking occurs, the stiffness is reduced and thereby also the stresses. For this reason, in structural parts affecte

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Shooter, Steven B., and Charles F. Reinholtz. "Extrinsic Calibration of Portable Manipulators." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0251.

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Abstract Portable manipulators are installed for operation and then removed upon completion of their task. Typical applications of portable manipulators include the inspection of nuclear reactors, inspection and repair of nuclear steam generators and asbestos removal in buildings. In such operations, it is difficult to precisely position the manipulator at a fixed location within its workplace, yet this is critical for accurate tool positioning. It can be possible, however, to position the tool tip at several points in the environment using video feedback and manual operator control of the man

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Звіти організацій з теми "Portal frame method"

Mazzoni, Silvia, Nicholas Gregor, Linda Al Atik, Yousef Bozorgnia, David Welch, and Gregory Deierlein. Probabilistic Seismic Hazard Analysis and Selecting and Scaling of Ground-Motion Records (PEER-CEA Project). Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2020. http://dx.doi.org/10.55461/zjdn7385.

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This report is one of a series of reports documenting the methods and findings of a multi-year, multi-disciplinary project coordinated by the Pacific Earthquake Engineering Research Center (PEER) and funded by the California Earthquake Authority (CEA). The overall project is titled “Quantifying the Performance of Retrofit of Cripple Walls and Sill Anchorage in Single-Family Wood-Frame Buildings,” henceforth referred to as the “PEER–CEA Project.” The overall objective of the PEER–CEA Project is to provide scientifically based information (e.g., testing, analysis, and resulting loss models) that

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TESTS, MODELLING AND DESIGN OF UNSYMMETRICAL BACK-TO-BACK COLD-FORMED STEEL ANGLES UNDER COMPRESSION. The Hong Kong Institute of Steel Construction, 2024. http://dx.doi.org/10.18057/ijasc.2024.20.2.11.

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Built-up cold-formed steel (CFS) unsymmetrical angles are increasingly used in structures such as portal frames, roof trusses, and transmission towers. However, there are limited studies on CFS unequal back-to-back angle columns (BBUAC) with stiffeners. This paper presents the results of six experimental tests on intermediate BBUAC with intermittent screw fasteners. The findings include the deformed shapes at failure and the load-axial shortening behavior. Additionally, a nonlinear finite element (FE) model that accounts for both material and geometric nonlinearity was developed. The experimen

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