Article
Construction & Building Technology
X. Cahis, A. Catalan, A. Benavent-Climent, D. Trias
Summary: This study introduces a new all-steel Buckling-Restrained Brace (BRB) called Coplanar Dual Core (CDC) BRB, which consists of a rectangular cross-sectional core divided into two coplanar yielding lateral bands constrained by an external restrainer (ER) and an internal restrainer (IR). Unlike traditional designs, the CDC-BRB allows for easy extraction and inspection of the core. The proposed design includes formulae for its design, determination of appropriate gap values, and prediction of its response and ultimate energy dissipation capacity.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Wei Li, Jing Dong, Hui Qu, Lanqin Wang, Kun Zhao
Summary: This paper conducts theoretical and numerical studies on the local buckling development of an H-section steel core of buckling restrained brace, revealing the characteristics and influencing factors.
Article
Construction & Building Technology
Yue Yuan, Jingwei Gao, Yuan Qing, Chun-Lin Wang
Summary: The new HBRB with movable steel blocks filled between the upper and lower flanges effectively restricts inward deformation, while closer transverse ribs reinforce to reduce local buckling of the flanges, improving seismic performance and stability. Compared to previous HBRB, the new HBRB exhibits better performance.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Tianyu Gu, Yan Liu, Liang-Jiu Jia, Hanbin Ge
Summary: An all-steel miniature buckling-restrained brace with a corrugated core bar, called CMBRB, has been proposed and proven to exhibit enhanced ductility and stable hysteretic behaviors during seismic events. The study examined the effects of slenderness ratio, spacing-to-notched cross section height ratio, and Teflon spacers on mechanical behaviors of CMBRBs through cyclic loading tests. The results showed that slenderness ratio and spacing-to-notched cross section height ratio had significant effects on strength, stiffness, energy dissipation, and ductility, while the spacers had no significant effect. Additionally, the study developed a design procedure to prevent local bulging failure of CMBRB, which exhibited good agreement with experimental and numerical results with a safety factor of 1.13.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Yi Zhang, Xin Ren, Xiang Yu Zhang, Ting Ting Huang, Long Sun, Yi Min Xie
Summary: A novel perforated negative Poisson's ratio core buckling-restrained brace was designed and studied to explore the seismic performance of auxetic metamaterials, revealing their potential for seismic mitigation applications.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Cong Zeng, Yifei Zhang, Junxian Zhao, Guoshan Xu, Dehong Wang, Tianlin Pan
Summary: A novel PTBRB was proposed and tested for seismic retrofitting of existing T-shaped steel members. The retrofitting scheme effectively increased the axial compression force capacity of the steel members without affecting their elastic stiffness. PTBRB specimens exhibited high ductility and cumulative plastic deformation capacity. Numerical analysis identified the controlled buckling mode and theoretical stability analysis confirmed the reliability of Bleich's theory. The maximum compression capacity of PTBRB was proposed and validated as the seismic fuse function.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Geological
Lie Luo, Xiaofeng Sun, Xiaobin Song, Zhaohui Ou, Lin Zhang
Summary: In this study, a hybrid buckling-restrained brace (BRB) composed of a cross-shaped steel core and a timber casing has been developed for enhancing the seismic performance of heavy-timber frame structures. The study investigates the design parameters and behavior of the novel timber buckling-restrained brace (T-BRB) through experimental testing and numerical modeling. The results show the importance of the constraint ratio and suggest improvements in fastener type and spacing for enhanced performance.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Crystallography
Junkai Lu, Weichuang Liu, Yong Ding, Yingying Li, Shuquan Xu
Summary: This study presents the finite element analysis results of the proposed buckling restrained brace with a longitudinally profiled steel core (LPBRB). The LPBRBs exhibited good ductile performance and stable hysteretic behavior. The friction coefficient has little influence on the hysteretic behavior of LPBRBs. The local stability can be improved by adopting the mortar with higher compression strength or the LP core with lower width:thickness ratio.
Article
Construction & Building Technology
Sijin Zhang, Hiroshi Tagawa, Xingchen Chen
Summary: This study proposes a novel buckling-restrained brace (BRB) that utilizes multiple round steel core bars to enhance the feasible strength. The proposed BRB consists of primary tubes and a secondary tube to restrain the buckling behavior. The study describes the configuration and design method of the proposed BRB and presents experimental and numerical analyses to verify the design.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Engineering, Civil
Hanbin Ge, Tianyu Gu, Jiong-Hui Li, Jubo Sun, Liang-Jiu Jia, Tao Liu
Summary: The proposed corrugated MBRBs have shorter length and smaller installation space compared to conventional MBRBs, with D-cuts improving ductility. However, the slenderness ratio and segment spacing significantly affect the seismic performance. The paper presents a theoretical model for stiffness and strength prediction, along with a design procedure and recommended values for the parameters.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Benyamin Mohebi, Mohammad Sartipi, Farzin Kazemi
Summary: In this study, the performance of the buckling-restrained brace (BRB) system was improved by introducing innovative lateral-resisting systems of double-stage yield buckling-restrained brace (DYB) and a combination of DYB improved with shape memory alloy (SMA) materials (DYBSMA). The results showed that the proposed BRB-DYBSMA system effectively reduced the displacement and residual displacement demands, making it the best lateral-resisting system.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Engineering, Civil
Jaskanwal P. S. Chhabra, Durgesh C. Rai
Summary: The application of Buckling Restrained Braces (BRBs) with Truss Moment Frames (TMFs) in seismic force-resisting systems has been studied. The use of annealed aluminum as a core material for BRBs has been found to be more effective than steel. Experimental studies on a Buckling Restrained Knee Braced Truss Moment Frame (BRKB-TMF) demonstrated the BRB acting as a fuse for the frame, successfully meeting the target drift criteria.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Engineering, Civil
Jiulin Bai, Huiming Chen, Shuangshuang Jin, Tao You
Summary: This study develops a new loading protocol considering variable axial loads to improve the accuracy of experimental investigations on the seismic performance of BRB-RCFs. The proposed dual-parameter loading protocol is validated through experiments and analytical results.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
An-Chien Wu, Keh-Chyuan Tsai, Chun Chen, Lu-An Chen, Yu-Cheng Lin
Summary: The proposed TC-BRB, which utilizes an additional truss confining system, has shown significant improvements in the stiffness, strength, and energy dissipation capacity of building structures. Experimental tests were conducted to investigate the hysteresis behavior of TC-BRBs, including the response of truss members, buckling resistance, and cumulative deformation capacity. The results demonstrated that TC-BRBs can be designed and fabricated to have a stable and repeatable hysteretic response, meeting the acceptance criteria of the American Institute of Steel Construction.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Engineering, Civil
Ying Zhou, Wenbo Tian, Yi Xiao
Summary: This paper conducted parametric study to compare the overall behavior of two typical self-centering buckling-restrained brace (SC-BRB) systems and proposed criteria for proportioning the system. The results showed that although the SC-BRB systems had smaller residual drifts, they generated more significant high-mode effect.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Hanheng Wu, Lu Sui, Tianhua Zhou, Ben Huang, Xiaohong Li
Summary: A novel self-centering energy-dissipating wall panel is introduced in the paper, consisting of prefabricated concrete wall panels, PT tendons, and replaceable dampers. Test results indicate that the dampers dissipate energy while the PT tendons provide restoring force, giving the walls a dual capacity of energy dissipation and resilience. Theoretical methods for estimating stiffness and strength parameters of the walls are derived based on the compatibility of force and deformation among the components.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Shaofeng Nie, Matthew R. Eatherton, Yong Han, Tianhua Zhou, Hanheng Wu, Jiang Li
Summary: A three part study was conducted to investigate the compression behavior of a built-up box column made from cold-formed steel channels. The study included experimental testing, finite element analysis, and evaluation of building code design methods. The results indicated that the dominant failure modes were global flexural buckling, local buckling, and concentrated localized deformation caused by local buckling. The study also found that screw spacing had little influence on axial compressive behavior, while web height-to-thickness ratio was a key parameter affecting axial compression strength. The accuracy and applicability of design methods were evaluated, with predictions ranging from -33% to +6% of the expected strength.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Liurui Sang, Tianhua Zhou, Lei Zhang, Bin Chen, Shuaibing Wang
Summary: This paper presents a comprehensive experimental investigation on the buckling behavior of cold-formed steel triple-limbs built-up columns affected by different buckling modes. The study includes 54 experimental tests with different screw spacings, as well as the investigation of the shear performance of the screws used. The results show that the direct strength method is accurate and reliable for the design calculation of pure buckling mode of triple-limbs built-up columns.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Wenchao Li, Yuan Jing, Tianhua Zhou, Guohua Xing
Summary: In this study, a new micromechanically-motivated phenomenological uncoupled fracture model is proposed for predicting the ductile fracture of structural metals. The model considers the combinative effects of stress state, strain hardening, and micro-void shape, and establishes an explicit and quantitative relationship between the ductility, strength, and microstructure of metals. The model parameters have intuitive physical meanings and can be easily calibrated via conventional tests.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Jiqin Wang, Tianhua Zhou, Hanheng Wu, Yu Guan, Lei Zhang
Summary: The study proposed a novel hybrid wall structure of a hot-rolled steel frame fabricated with a cold-formed steel composite wall, which showed optimal seismic performances and significant effects on bearing capacity, stiffness, and energy dissipation capacity. The infilled CFS composite walls were more vulnerable to damage compared to the steel frames, but the frames effectively prevented severe collapse of the infilled walls.
ENGINEERING STRUCTURES
(2022)
Article
Construction & Building Technology
Fangfang Liao, Xiaohong Li, Wei Wang, Yiyi Chen, Tianhua Zhou, Shaofeng Nie, Gen Li
Summary: In this study, four high-strength steel welded cruciform beam-column connection specimens were designed with different forms of weld access holes and expanded beam flange configuration. Quasi-static tests were conducted, and the seismic performance of the specimens was studied, showing good performance. Finite element analysis (FEA) results were consistent with test results, and it was found that ductility of high-strength steel welded connections can be improved by changing the form of weld access holes.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Engineering, Civil
Jiqin Wang, Tianhua Zhou, Shaofeng Nie, Xudong Zhang, Yinghao Shao
Summary: A novel CFS shear wall filled with lightweight ceramsite concrete is proposed in this paper. Experimental and numerical methods were used to evaluate its performance, and comparison was made with existing CFS shear walls.
Article
Construction & Building Technology
Liurui Sang, Tianhua Zhou, Lei Zhang, Bo Zhu, Shuaibing Wang
Summary: This paper presents a comprehensive experimental program on the distortional buckling behavior of cold-formed steel built-up I-section columns. The study investigates the influence of different cross-sectional dimensions and screw spacings on the buckling behavior. Experimental tests were conducted to measure material properties, geometric dimensions, and initial imperfections. The results were used to establish nonlinear finite element models and a theoretical model for the distortional buckling. A calculation method considering post-buckling strength was proposed and validated. The study provides valuable insights into the buckling behavior of built-up I-section columns.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Engineering, Civil
Lei Zhang, Tianhua Zhou, Liurui Sang, Yunzhe Wang, Shuaibing Wang
Summary: This study aims to gain a thorough understanding of the mechanics of three-limbed built-up open-section columns undergoing local-distortional interaction buckling. Experimental and numerical simulation methods were used. The results show that the studied built-up section had an evident assembly effect, and the bearing capacity of the built-up open-section column was sensitive to the web height-thickness ratio. Additionally, the screw spacing had a minor influence on the ultimate bearing capacity of the three-limbed built-up open-section columns under local-distortional interaction buckling.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Liurui Sang, Tianhua Zhou, Lei Zhang, Teng Zhang, Shuaibing Wang
Summary: A series of axial compression tests were conducted on cold-formed steel built-up I-section columns with lipped channel sections connected by self-drilling screws. The study investigated the buckling behavior, failure mode, and ultimate bearing capacity of these columns. A nonlinear finite element model was established and validated. An estimation method for the local buckling bearing capacity was proposed, based on the local buckling critical stress calculation formula and local buckling bearing capacity curve. Simplified calculation formulas for local buckling critical stress were given for different geometric parameter ranges. The method was compared with experimental and finite element results.
Article
Engineering, Civil
Hanheng Wu, Lu Sui, Xin Liu, Shanglin Liang, Tianhua Zhou
Summary: By studying the shear-slip constitutive model of screw connections between cold-formed steel (CFS) profiles and its application in numerical analysis of CFS built-up columns, it was found that the thicknesses of C-section steels and diameters of self-drilling screws have an impact on the shear performance of connections. The failure modes of the connections can be divided into three types. A shear-slip constitutive model of screw-fastened connections was developed, and methods for estimating stiffness parameters, strength parameters, and displacement parameters were derived. Numerical models were proposed based on previous tests, and the results of numerical simulation were consistent with the previous test results.
THIN-WALLED STRUCTURES
(2023)
Article
Construction & Building Technology
Yu Guan, Jiqin Wang, Yu Shi, Shuai Zhao, Tianhua Zhou, Xinmei Yao
Summary: The in-plane cyclic and out-of-plane flexural performances of cold-formed steel (CFS) floors were experimentally investigated and modeled using ABAQUS software in this study. The effects of various factors on the bearing capacity of CFS floors with openings were examined, and measures to improve the bearing capacity were identified. The study developed a calculation method for evaluating the in-plane and out-of-plane ultimate bearing capacities of CFS floors with openings and provided a scientific basis for the design of composite floors for multistory CFS structures.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Civil
Yanchun Li, Ruibo Li, Tianhua Zhou, Aihong Han, Yanfen Xie
Summary: The ultimate capacity and failure modes of composite plates assembled using self-drilling screws have been extensively investigated in this study, focusing on the cold-formed steel (CFS) built-up plate connected by self-drilling screws. A theoretical model for the critical buckling stress of the screw built-up plate (SBP) is presented, considering the influence of shear slip effect. Kinematic relations between single plates of the SBP are derived using the energy method, and a stress calculation equation for the SBP is proposed through theoretical derivation. Finite element analysis is conducted to study the influence of key parameters on the proposed equation.
Article
Construction & Building Technology
Lu Sui, Hanheng Wu, Menglong Tao, Zhichao Jia, Tianhua Zhou
Summary: The self-centering energy-dissipating coupled wall panels (SECWs) have the capability of both resiliency and energy dissipation, allowing them to localize damage and reduce residual drifts in steel frame structures. Nonlinear models based on OpenSEES were validated using experimental results, and a seismic design procedure for steel frame with SECW structures (SF-SECW) was proposed according to four-level seismic fortification objectives. Nonlinear time-history response analyses confirmed the reasonability of the seismic design procedure for 6-story and 12-story structures, with inter-story drifts below limit values. Fragility curves obtained from incremental dynamic analyses (IDA) indicated that the designed structures have good seismic performance and meet the seismic fortification objectives.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Liang Bai, Huilin Wei, Bin Wang, Fangfang Liao, Tianhua Zhou, Xingwen Liang
Summary: This paper investigates steel tubes encased high-strength concrete (STHC) composite walls and evaluates their failure pattern, load-bearing capacity, ductility, deformability, and strain distribution through cyclic loading tests. The results show that embedding steel tubes at the boundary elements improves the bearing capacity and ductility of STHC composite walls. An analytical method accurately predicts the flexural bearing capacity, and a finite element modeling (FEM) analyzes the mechanical performance and investigates various influencing factors.
STEEL AND COMPOSITE STRUCTURES
(2023)
