多层结构局部延性与整体延性需求关系解析  

Analysis of Relationship Between Local and Global Ductility Demands of Multi-Rise Structures

作　　者：周靖[1] 方小丹[2] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [2]华南理工大学建筑设计研究院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2011年第12期132-137,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：中国博士后科学基金资助项目(20100480757);教育部高等学校博士学科点专项科研基金资助项目(20094301120001);亚热带建筑科学国家重点实验室基金资助项目(2010KB13)

摘　　要：在理想模型结构假定基础上,采用理论分析方法,推导出多层结构整体延性需求与楼层延性需求、以及楼层延性需求与竖向支撑构件延性需求的简化解析关系.最不利解析关系以及数值算例结果表明:薄弱层局部延性需求大于整体结构延性需求;增加楼层数,薄弱层局部延性需求增大;楼层屈服后刚度对局部与整体延性需求的关系也有重要影响;弱柱单元延性与楼层延性需求的关系跟强柱、弱柱的侧向刚度比以及抗侧屈服强度比相关,刚度比越大弱柱延性需求越小(下限),强度比越大弱柱延性需求越大(上限).Based on a reasonable assumption of modeled structures,simplified analytical relationships between global ductility demands and local-storey ductility demands,as well as between local-storey ductility demands and vertical element ductility demands,are derived by theoretical analysis for multi-rise structures.Both the most unfavorable analytical relationship and the numerical results indicate that(1) the local ductility demand of the weak storey is larger than the global one and increases owing to any additional storey;(2) the post-yield stiffness of storey greatly influences the relationship between the local and the global ductility demands;(3) the relationship between the soft-weak column element and the local storey ductility demands correlates with the lateral stiffness ratio and the yield strength ratio of the strong column to the weak column;and(4) the ductility demand of the soft-weak column(the lower limit) decreases with the increase in the stiffness ratio but increases(the upper limit) with the yield strength ratio.

关 键 词：建筑结构 延性需求 侧向刚度 理论解析 

分 类 号：TU352.1[建筑科学—结构工程]