長跨桁架圍束式挫屈束制支撐之研究

陳雋; 林昱成; 吳安傑; 陳律安; 蔡克銓

doi:10.6849/SE.202106_36(2).0001

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工程学 > 工程学总论
工程学 > 土木与建筑工程

DOI： 10.6849/SE

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长跨桁架围束式挫屈束制支撑之研究

Long-Span Buckling-Restrained Braces using Truss-Confined Restrainers

陈隽(Chun Chen) ；林昱成(Yu-Cheng Lin) ；吴安杰(An-Chien Wu) ；陈律安(Lu-An Chen) ；蔡克铨(Keh-Chyuan Tsai)

结构工程； 36 卷 2 期 (2021 / 06 / 01) ， P5 - 50

繁体中文 DOI： 10.6849/SE.202106_36(2).0001

挫屈束制支撑；巨型斜撑；桁架围束单元；挠曲刚度；剪力刚度；稳定性分析； buckling-restrained brace ； mega brace ； truss-confined restrainer ； flexural rigidity ； shear rigidity ； stability analysis

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摘要 │ 参考文献 (34) │ 被引用文献 (1) │ 国际计量

摘要〈TOP〉

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Long span buckling-restrained braces (BRBs) are getting popular for applications in seismic tall buildings. Recently, a novel type of BRB, namely the truss-confined BRB (TC-BRB) with a constant-depth truss built into the restrainerhas been investigated. The TC-BRB's restrainer is constructed by attaching an additional truss system composed of several steel open-web truss frames outside the central steel casing in order to develop the overall restraining rigidity. Thus, the cross-sectionof the central steel casing and the weight of the infilled mortar in the TC-BRB can be significantly reduced in comparison with the conventional BRBs. The initial crookedness caused by the BRBs' self-weight can also be reduced in the cases of long-span and large axial capacity BRB designs. This study investigates a new type of TC-BRB using a varying-depth truss system in the restrainers. This type of TC-BRB could save construction material and achieve the structural aesthetic more effectively than those using the constant-depth trusses. In this study, stability analytical model and seismic design procedures are developed and verified. Key mechanical properties including equivalent flexural rigidity and shear rigidity of the truss system are firstly presented. It is illustrated that the TC-BRBs' elastic flexural buckling strength (P_(cr)) can be satisfactorily computed by incorporating Timoshenko shear effect into the classical stability theory. TC-BRBs's buckling failure strength (P_(lim)) can be further computed by considering the initial imperfections and inelastic material property. Abaqus finite element model (FEM) analysis results indicate that the proposed analytical model can satisfactorily predict the restrainers' P_(cr) with errors less than 10%; and predict the TC-BRBs' P_(cr) with errors less than 3%. In the first phase experiment, two 1/5-scale TC-BRB specimens, each of 6.3m long with the 1016-kN nominal yield strength anda constant- or varying-depth truss design, were tested in NCREE. Cyclic test results confirm that the P_(lim) of the two TC-BRB specimens can be accurately predicted using the proposed analytical model with errors less than 6% when the effects of residual stresses in the truss members are considered. In the second phase experiment, two additional specimens were fabricated with significantly increased stability capacities. Cyclic test results show that the P_(lim) of these two specimens can also be accurately predicted with the errors less than 7%, further confirm the reliability of the proposed analytical model. The TC-BRBs' experimental performance also suggests that the proposed design procedures are generally conservative and practical. This study concludes with the recommendations, produres and examples on the seismic design of the proposed TC-BRBs using the constant- or varying-depth trussses.

参考文献 ( 34 ) 〈TOP〉

欧易佳,陈力维,蔡青宜,吴安杰,蔡克铨(2020)。利用虚拟侧力与破坏机制探讨挫屈束制支撑面外稳定性及案例评估分析。结构工程，35(1)，78-105。
连结：
Abaqus(2013).Abaqus, 2013. Abaqus Version 6.13 Documentation.Dassault Systèmes Simulia Corporation, Providence, Rhode Island..
American Institute of Steel Construction=AISC(2016).Specification for Structural Steel Buildings (AISC 360-16).Chicago, Illinois:AISC.
American Institute of Steel Construction=AISC(2016).Seismic Provisions for Structural Steel Buildings (AISC 341-16).Chicago, Illinois:AISC.
Chen, LW,Tsai, KC,Tsai, CY,Wu, AC(2019).Evaluating out-of-plane stability for welded BRBs considering flexural restrainer and gusset rotations.Journal of Constructional Steel Research,159,161-175.

被引用文献 ( 1 ) 〈TOP〉

蔡克铨,陈隽,陈律安,吴安杰(2022)。变断面桁架围束式挫屈束制支撑设计分析与试验研究。结构工程，37(3)，27-47。

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