基于能力需求比的RC框架结构反应修正系数评定

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (6) : 271-276.

论文

崔双双1,2，孙浩1，陈伟宏3，韩旭1，宋鹏彦4

作者信息 +

Assessment of structural response modification factors of RC frames based on capacity-demand ratio

CUI Shuangshuang1,2, SUN Hao1, CHEN Weihong3, HAN Xu1, SONG Pengyan4

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文章历史 +

摘要

我国现行抗震规范隐含的结构反应修正系数为一个常数R≈3.0，为了评定RC结构反应修正系数的取值是否合理，引入了反应修正系数能力需求比的概念。按我国现行抗震设计规范设计了不同层数、不同设防烈度的17个RC框架结构，基于OpenSees有限元平台，采用Pushover分析方法对结构进行抗倒塌能力进行分析，得到“临界倒塌状态”时的结构反应修正系数能力值；分别采用静力能力谱和动力能力谱分析方法，对结构在罕遇地震作用下的需求进行分析，得到反应修正系数需求值及其变化规律；进而得到反应修正系数能力需求比λ，其值均大于1，结构满足“罕遇地震作用下结构不发生倒塌”这一性能目标，且按VIII度设防设计的结构的反应修正系数较合理，按VII度设防设计的结构的反应修正系数偏于保守，按VI度设防设计的结构的反应修正系数过于保守，VI度设防时结构反应修正系数可以安全提高。

Abstract

Structural response modification factor implied in our country’s current aseismic design code is a constant R≈3.0.Here, to assess whether or not the chosen value of structural response modification factor for RC frames be reasonable, a capacity-demand ratio λ was introduced.17 RC frames with different stories and fortification intensities were designed according to our country’s current aseismic design code.Based on the finite element platform OpenSees,Pushover analysis method was used to analyze these frames’ structural anti-collapse capacities, and obtain capacity values of their structural response modification factors under critical collapse state.The static capacity spectrum method and dynamic capacity spectrum one were used to analyze structure’s demand under rarely occurred earthquake, and obtain demand values and variation laws of structural response modification factors.Then, the capacity-demand ratios λ was obtained, and it was shown that its value always is larger than 1.The results showed that RC frames designed can satisfy the expected safety performance objective against collapse under rarely occurred earthquake;response modification factors of structures designed according to 8° fortification intensity are more reasonable, while those of structures designed according to 7° fortification intensity are more conservative;those of structures designed according to 6° fortification intensity are too conservative, and they can be safely increased.

导出引用

崔双双1,2，孙浩1，陈伟宏3，韩旭1，宋鹏彦4. 基于能力需求比的RC框架结构反应修正系数评定[J]. 振动与冲击, 2020, 39(6): 271-276

CUI Shuangshuang1,2, SUN Hao1, CHEN Weihong3, HAN Xu1, SONG Pengyan4. Assessment of structural response modification factors of RC frames based on capacity-demand ratio[J]. Journal of Vibration and Shock, 2020, 39(6): 271-276

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