摘要
为研究地震作用下我国规范层间位移角限值的合理性,将其与美国规范的层间位移角限值进行对比。基于等位移原理推导中美规范层间位移角限值的对比方法,提出中美规范层间位移角限值富裕度指标β。设计框架、剪力墙、框架-剪力墙和框架-核心筒等80个典型RC结构模型,验证结构在设防烈度地震作用下处于弱非线性。分析结构体系、场地类别和设防烈度对β的影响,结果显示,模型的β值均大于1,说明中国规范层间位移角限值比美国规范更为严格。以β作为修正系数,将四种结构体系的位移角限值统一调整为1/500,重新设计16个模型,采用基于构件变形的抗震性能评估方法,验证层间位移角限值调整后结构在强震下的安全性。建议:多遇地震作用下RC结构层间位移角限值可取1/500。
To study the rationality of story drift limits in Chinese codes,the American codes were compared.According to the principle of equal displacement,a method of comparing the story drift limits between Chinese codes and American codes was deduced and the ratio of story drift limits of Chinese-American codes,β,was proposed.A total of 80 typical reinforced concrete structural models,including frame structures,shear wall structures,frame-shear wall structures and frame-core tube structures,were designed,and the weak non-linearity of structure under fortified earthquakes can be verified.Furthermore,the influences of structural system,site classification and fortification intensity on β were analyzed.The results show that β is always larger than 1.0 for all models,indicating that the story drift limits in Chinese codes are more stringent than those in American codes.With β used as the correction factor,story drift limits for all the 4 structural systems were adjusted to 1/500.Additionally,16 models were designed and structural safety under strong earthquakes was verified by employing component deformation-based performance evaluation method.It is suggested that the story drift limits of RC structures under frequent earthquakes can be taken as 1/500.
作者
韩小雷
张垒
杨光
季静
李建乐
Han Xiaolei;Zhang Lei;Yang Guang;Ji Jing;Li Jianle(School of Civil Engineering&Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Architecture Science,South China University of Technology,Guangzhou 510641,China;Weiwang Architecture and Technology Co.,Ltd.,Guangzhou 510623,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第1期31-38,共8页
China Civil Engineering Journal
基金
广东省自然科学基金(2017A030313306,2017A030313274)
广州市科技计划(201904010221)
关键词
层间位移角限值
中美规范对比
等位移原理
性能评估
story drift limit
comparison of Chinese and American codes
principle of equal displacement
performance evaluation
