高强钢组合Y形偏心支撑结构影响系数和位移放大系数研究  

Research on Influence Coefficient and Displacement Amplification Factor of High-Strength Steel Composite Y-Type Eccentrically Braced Structures

作　　者：李慎[1] 张原硕 李晓蕾[1] 田建勃[1] 杜宁军 LI Shen;ZHANG Yuanshuo;LI Xiaoei;TIAN Jianbo;DU Ningjun(Xi’an University of Technology,School of Civil Engineering and Architecture,Xi’an 710048,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048

出　　处：《工业建筑》2023年第6期111-121,共11页Industrial Construction

基　　金：国家自然科学基金项目(52108175);陕西自然科学基金项目(2022JM-220);陕西省博士后基金项目(2018BSHEDZZ24)。

摘　　要：高强钢组合Y形偏心支撑结构是指耗能梁段采用普通钢材(f_(y)≤345 MPa),保证地震作用下结构具有良好的塑性变形能力,框架梁、柱采用高强钢(f_(y)≥460 MPa)降低构件截面尺寸,同时保证非耗能构件的弹性受力状态,该新型结构具有良好的延性和耗能能力。结构影响系数R是基于性能的抗震设计方法中至关重要的部分,若R取值合理,则结构抗震设计更加安全、合理、经济。我国2016版GB 50011—2010《建筑抗震设计规范》中隐藏了结构影响系数的概念,且对所有的结构体系取统一值,显然不尽合理。研究高强钢组合Y形偏心支撑结构的结构影响系数和位移放大系数可进一步优化结构性能化设计方法,为该类型结构今后的设计取值提供参考依据。为此对12个Y形偏心支撑钢框架有限元模型进行静力弹塑性分析和增量动力分析(IDA分析),得到结构的性能曲线。利用能力谱法计算各原型结构的R、C_(d)、R_(μ)和R_(Ω),分析结构层数N和耗能梁段长度e对各性能系数的影响。对比Pushover分析和IDA分析所得结果,提出了各性能系数的建议取值。The high-strength steel composite Y-type eccentrically braced structure is a new type structure.Ordinary steel(f_y≤345 MPa) is utilized in links to ensure the structure has good plastic deformation capacity under strong earthquake,and high-strength steel(f_y≥460 MPa) is used in frame beams and columns to reduce the cross-sectional size while ensuring the elastic stress state of non-energy consuming components.The new structure has good ductility and energy-dissipating capacity.The structural influence coefficient R is a crucial part of the performance-based seismic design method.If a reasonable value of R is used,the seismic design of structure will be safer,more reasonable,and more economical.It is obviously not reasonable to hide the concept of the structural influence coefficient and adopt a fixed value for all structural systems in the 2016 edition of China's Code for Seismic Design of Buildings(GB 50011—2010).The research can not only improve the structural performance design method,but also provide a reference for the future design of the structure.The static elastic-plastic analysis(Pushover analysis) and incremental dynamic analysis(IDA analysis) were carried out on 12 finite element models of high-strength steel composite Y-type eccentrically braced frames,and the data obtained by IDA analysis were fitted to reach the IDA performance curve of the structure.The R,C_d,R_μ and R_Ω of each prototype structure were calculated by the capability spectrum method,the effects of the number of structural story N and the length of link e on performance coefficients were analyzed.Comparing the results of Pushover analysis and IDA analysis,the proposed values of each performance coefficient were proposed to provide a reference for the performance design of the new structural systems in the future.

关 键 词：静力弹塑性分析 增量动力分析 结构影响系数 位移放大系数 高强钢组合Y形偏心支撑结构 

分 类 号：TU391[建筑科学—结构工程]