摘要
钢框架-钢筋混凝土核心筒结构地震响应属于非经典阻尼体系动力分析。为了应用基于振型叠加的CQC法分析地震响应,目前有四类方法可供选择:整体计算方法、模态阻尼比法、强迫解耦法、复模态分析法。这四类地震响应分析方法各有利弊,哪一个方法更为有效,工程师往往不好判断。对于钢框架-钢筋混凝土核心筒结构阻尼比如何取值,本文进行了分析研究,首先综述了上述四类地震响应分析方法的理论背景,根据不同构件单元变形能的大小,提出采用变形能加权平均的方法,计算组合结构的综合阻尼比。通过实例分析,计算结果取得了较好的精度,该方法可以用于工程的抗震分析。
The seismic response of steel frame reinforced concrete core tube structure belongs to the dynamic analysis of nonclassically damped systems.In order to apply CQC method based on mode superposition to analyze the seismic response,there are four kinds of methods available at present:integral calculation method,modal damping ratio method,forced decoupling method and complex modal analysis method.These four kinds of seismic response analysis methods have their own advantages and disadvantages,which method is more effective,engineers are often difficult to judge.This paper analyzes how to determine the damping ratio of steel frame reinforced concrete core tube structure.Firstly,the theoretical background of the above four kinds of seismic response analysis methods is summarized.According to the deformation energy of different component elements,the weighted average method of deformation energy is proposed to calculate the comprehensive damping ratio of composite structure.Through the analysis of the calculation results of an example,good accuracy is obtained,which can be used for the seismic analysis of engineering.
作者
张文利
ZHANG Wenli(College of Water Resources and Architecture Engineering,North West A&F University,Yangling 712100,China)
出处
《建筑结构》
CSCD
北大核心
2021年第S01期794-803,共10页
Building Structure
关键词
钢框架-钢筋混凝土核心筒结构
非经典阻尼体系
振型叠加法
综合阻尼比法
steel frame reinforced concrete core tube structure
nonclassically damped systems
mode superposition method
integrated damping ratio method
