Seismic vulnerability analysis of framed seismic reduction structures based on IDA method

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Sept.2025, Vol.48 No.9: 1276-1282

DOI: 10.3969/j.issn.1003-5060.2025.09.018

Authors

MIAO Qihao $ ^{1} $, CHEN Daozheng $ ^{1,2} $, WANG Weiqiang $ ^{3} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China; 3. College of Electronic Engineering, National University of Defense Technology, Hefei 230037, China)

Abstract and Keywords

Abstract: Using a frame structure as the research object, this paper adopts flexural restraint bracing as the energy dissipation and shock absorption device, establishes the energy dissipation and shock absorption analysis model of the structure through the finite element analysis software ETABS, carries out the dynamic time history analysis of the structure under the action of multiple and rare earthquakes and the seismic vulnerability analysis based on the incremental dynamic analysis (IDA) method, and evaluates the probability of the energy dissipation and shock absorption structure to reach the quantitative index of each limit state under the action of different intensity of ground shaking from the perspective of probability. The results show that the lateral stiffness of the frame structure increases after the reasonable arrangement of flexural restraint bracing, the lateral deformation of the structure is significantly reduced under small earthquakes, and the bracing yields and dissipates energy under large earthquakes, and the structure has a better seismic energy dissipation mechanism, which can meet the performance target of "no damage under small earthquakes, repairable under medium earthquakes and no collapse under large earthquakes". At the same time, the seismic vulnerability analysis based on the IDA method can also provide a concise and effective scientific reference basis for the estimation of losses and design of actual engineering structures.

Keywords: frame structure; flexural restraint bracing; seismic vulnerability analysis; time history analysis; energy dissipation and shock absorption

作者信息

缪琪皓 $ ^{1} $，陈道政 $ ^{1,2} $，王伟强 $ ^{3} $

（1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 中国地震局工程力学研究所地震工程与工程振动重点实验室，黑龙江哈尔滨 150080；3. 国防科技大学电子对抗学院，安徽合肥 230037）

摘要和关键词

摘要: 文章以某框架结构为研究对象, 采用屈曲约束支撑为消能减震装置, 通过有限元分析软件 ETABS 建立结构的消能减震分析模型, 开展结构在多遇和罕遇地震作用下的动力时程分析及基于增量动力分析（incremental dynamic analysis, IDA）方法的地震易损性分析, 从概率的角度综合评定消能减震结构在不同强度的地震动作用下达到各个极限状态量化指标的可能性大小。结果表明, 合理布置屈曲约束支撑之后, 框架结构的侧向刚度增加, 小震下结构侧向变形明显降低, 大震下支撑屈服耗能, 结构具有较好的抗震耗能机制, 能够满足“小震不坏, 中震可修, 大震不倒”的性能目标。同时, 该研究采用的基于 IDA 方法的结构地震易损性分析也可为实际工程结构的损失估计和设计提供简明有效的科学参考依据。

关键词: 框架结构；屈曲约束支撑；地震易损性分析；时程分析；消能减震

Funding

中国地震局工程力学研究所基本业务费专项资助项目（220EEEVL0417）

合肥工业大学学报(自然科学版)

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