摘要
自复位支撑集成耗能与复位能力,在地震作用下有效保护主体结构,消除残余变形。地震过后常伴有强度较大的余震发生,易加重累积损伤,导致结构发生更严重的破坏甚至倒塌。为此,提出了考虑主余震效应的自复位支撑RC框架结构设计方法,以结构损伤等效为原则,引入地震影响系数修正系数并给出建议取值。通过改变自复位支撑设计参数,对一支撑框架结构进行改进设计,并将其与初始结构抗震性能进行对比,验证了设计方法的可行性与合理性。结果表明:改进后结构在主余震作用下的残余位移更小,均值仅为0.05%,层间位移角较初始结构明显减小,加速度响应较初始结构减小12.7%~29.4%。随着地震强度增大,结构在余震时期耗能增长的主要来源由结构阻尼变为支撑,说明强余震作用下,自复位支撑充分发挥耗能能力,避免结构发生倒塌。
The self-centering brace integrates energy dissipation and recentering capacities to effectively protect the main structure and eliminate the residual deformation under the action of earthquakes.After an earthquake,it is often accompanied by strong aftershocks,which are prone to increase the cumulative damage and lead to more serious damage or even collapse of the structure.Thus,a design approach of the self-centering braced RC frame structure considering the main and aftershock effect is proposed.Based on the equivalent principle of structural damage,the correction coefficient of seismic influence coefficient is introduced and its recommended value is given.By changing the design parameters of the self-centering brace,the improved design of a braced frame structure was carried out,and its seismic performance is compared with that of the initial structure to verify the feasibility and rationality of the design approach.The results show that the improved structure has a smaller residual displacement under the action of main and aftershocks,and the average value is only 0.05%.Compared with the initial structure,the interstory drift ratio of the improved structure is significantly reduced,and the acceleration response is reduced by 12.7%~29.4%.With the increase of earthquake intensity,the main source of the growth of structural energy dissipation during aftershocks changes from structural damping to braces,indicating that under the action of strong aftershocks,the self-centering braces can give full play to the energy dissipation capacity and prevent the structure from collapse.
作者
谢行思
徐龙河
敬祺轲
Xie Xingsi;Xu Longhe;Jing Qike(Beijing Jiaotong University,Beijing 100044,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2022年第S01期32-38,共7页
China Civil Engineering Journal
基金
国家自然科学基金(52125804,52078036)
关键词
主余震
钢筋混凝土框架结构
自复位支撑
抗震性能
设计方法
main and aftershock
reinforced concrete frame structure
self-centering brace
seismic performance
design approach
作者简介
谢行思(1992—),男,博士,讲师。主要从事结构抗震方面的研究;通讯作者:徐龙河(1976—),男,博士,教授。主要从事结构抗震与健康监测方面的研究;敬祺轲(1997—),女,硕士研究生。主要从事结构抗震方面的研究。
