摘要
全装配式预应力自复位混凝土框架是将无粘结预应力技术和摩擦耗能技术应用到传统预制装配式框架中的一种新型结构体系。其中,梁-柱和柱-基础节点均采用无粘结预应力进行连接,提供结构的震后复位能力;梁端设置了摩擦耗能装置,用于耗散地震能量。本文采用非线性静力和动力时程分析方法,研究了一个3跨2层的自复位混凝土框架的抗震性能,并和传统现浇混凝土框架的抗震性能进行了对比分析。结果表明,和传统现浇混凝土框架相比,自复位混凝土框架具有更大的侧向刚度和较小的耗能能力。在中震和大震作用下,自复位混凝土框架的残余变形很小,最大层间侧移角要稍大于传统现浇混凝土框架;而传统现浇混凝土框架在大震作用下的残余层间侧移角已达到0.67%,震后修复代价较大。
The fully prefabricated post-tensioned self-centering (SC) concrete frame is a new seismic-resistant structure,which implements unbounded post-tensioning and frictional energy dissipating technologies into the conventional unbounded prefabricated concrete frame. In this new frame structure,the beam-column and columnfoundation connections are established using unbonded post-tensioning to provide the self-centering capability,and friction energy dissipation devices are installed at the beam ends to dissipate earthquake energy. Using nonlinear static and dynamic time-history analysis methods,the seismic performance of a 3-bay,2-story self-centering concrete frame is studied,and comparisons with a traditional cast-in-place reinforced concrete (RC) frame structure are provided. The analysis results show that the SC concrete frame has higher lateral stiffness and lower energy dissipation capacity compared with the RC frame. When subjected to the moderate and rare earthquakes,the SC frame sustains insignificant residual deformations,and has larger maximum story drift rations than the RC frame. However,under the rare earthquakes,the residual story drift ratio of the RC frame is 0. 67%,which can lead to high post-earthquake repair cost.
作者
宋良龙
孙勇
俞伟根
朱燕清
Song Lianglong;Sun Yong;Yu Weigen;Zhu Yanqing(College of Ciril and Transporation Engineering,Hohai University,Nanjing 210098,China;Jiangsu Research Institute of Building Science Co.Ltd,Nanjing 210008,China)
出处
《建筑科学》
CSCD
北大核心
2020年第5期7-12,共6页
Building Science
基金
国家重点研发计划(2016YFC0701600)
国家自然科学基金(51708172)
江苏省自然科学基金(BK20170890)
中国博士后科学基金(2019M651674)。
关键词
装配式框架
自复位
预应力
抗震性能
prefabricated frame
self-centering
prestressing
seismic performance
