(西安交通大学人居环境与建筑工程学院， 西安 710054)

［摘要］作为一种常见的耗能减震构件，屈曲约束支撑越来越广泛地应用于钢筋混凝土框架结构中，然而现行《建筑抗震设计规范》（GB 50011—2010）(2016版)和《混凝土结构设计规范》（GB 50010—2010）(2015版)并没有明确给出这类结构的弹性层间位移角限值。基于ANSYS软件，分别对纯框架结构和含屈曲约束支撑的钢筋混凝土框架结构（简称BRB-RC框架结构）进行非线性有限元分析，结果表明BRB-RC框架结构应当考虑更为严格的水平位移控制参数，并通过静力试验验证了数值模拟的可靠性。当确定弹性层间位移角限值的建议取值时，发现若采用初裂层间位移角作为位移角限值偏于严格，无法直接用于工程实践。基于比较分析法提出了标记层间位移角的概念。通过改变支撑参数、混凝土强度和结构跨度，进行9组算例的数值计算和分析，研究这9个试件标记层间位移角与刚度比的关系，最终保守地给出了BRB-RC框架结构弹性层间位移角限值的取值公式。提出的方法能够满足工程实践的需要。

［关键词］屈曲约束支撑； 钢筋混凝土框架； 弹性层间位移角限值

中图分类号：TU318+.1文献标识码：A文章编号：1002-848X(2019)13-0106-08

Research of limit of elastic inter-story drift ratio for RC frame with bucking restrained braces

Yue Yanchao, Lu Xiaoming, Wang Yan

(School of Human Settlements and Civil Engineering, Xi′an Jiaotong University, Xi′an 710054, China)

Abstract:Buckling restrained brace (BRB), which is widely used in reinforced concrete frame structures, is a kind of common energy dissipated component. However, the current Code for seismic design of building (GB 50011—2010)(2016 edition) and Code for design of concrete structures (GB 50010—2010)(2015 edition) do not explicitly provide the limit of elastic inter-story drift ratio of the structure. Based on ANSYS software, nonlinear finite element analysis was carried out on pure frame and RC frame with bucking restrained braces(BRB-RC frame)  respectively. The results show that more strict horizontal displacement control parameters should be considered for BRB-RC frame, and the reliability of numerical simulation was verified by static test. When determining the suggested value of limit of  the elastic inter-story drift ratio, it was found that directly using the inter-story drift ratio between initial cracked layers as limit of elastic inter-story drift ratio is too strict to be used in engineering practice. Based on comparative analysis, the concept of marked inter-story drift ratio was proposed. By changing the supporting parameters, concrete strength and structural span, the numerical calculation and analysis of nine sets of examples were carried out, and the relationship between the marked inter-story drift ratio and the stiffness ratio of the nine specimens was studied.In the end, the formula of limit of elastic inter-story drift ratio for reinforced concrete frame with bucking restrained braces was conservatively given. The method proposed  can meet the  needs of enineering practice.

Keywords:bucking restrained brace; reinforced concrete frame; limit of elastic inter-story drift ratio

*国家自然科学基金项目(51408481)。

作者简介：岳焱超，博士，讲师， Email: 1528017958@qq.com。