摘要
由于规范标准对结构抗震设计要求的不断提高以及结构在长期服役过程中性能的逐渐劣化,既有建筑结构的抗震性能不再满足设计要求,开展其抗震加固设计研究势在必行。然而,目前的加固设计方法往往需要大量的非线性动力计算反复迭代,增加了设计的难度,降低了其适用性。基于能量平衡概念,提出适用于增设消能减震装置的既有建筑结构抗震加固性能化设计方法。该方法考虑了多地震水准性能目标,设计过程中无需开展非线性动力计算,且迭代次数少。采用所提方法对Benchmark钢框架结构进行加固设计,通过非线性动力分析评估了加固前和加固后结构的抗震性能。研究结果表明:加固后,所有楼层的位移角均明显降低,小震、中震和大震时的平均降幅约为20%,可见加固后结构抗震性能得到了显著改善;加固结构在小震、中震和大震下的层间位移角均与设计值吻合,实现了预期的层间位移角和屋顶位移角目标,验证了所提方法的有效性;所提方法设计的阻尼器在小震时整体保持弹性状态,在中震和大震时进入屈服耗能状态,实现了预期的耗能机制,且阻尼器延性需求沿楼层的分布较为均匀,进一步表明了设计方法的合理性。研究成果可为既有建筑结构的抗震性能加固设计提供参考。
Due to the increasing requirements in seismic design codes and the performance deterioration of structures during the long-term service,seismic performance of existing buildings will no longer meet the design requirements.It is imperative to conduct seismic retrofit design.However,the current retrofit design method usually needs a large number of repeated iterations of nonlinear dynamic calculation,increasing the design difficulty and reducing its applicability.A performance-based seismic retrofit design method is proposed for the existing buildings based on energy balance,which is applicable for structural retrofitting with energy dissipation devices.It considers the performance target of multiple seismic levels without nonlinear dynamic calculation and few iterations during the design.A benchmark steel frame is retrofitted by the proposed method,and nonlinear dynamic analysis is performed to evaluate the performance of the original and retrofitted structures.The results show that the drift ratio of all floors is significantly reduced after retrofitting,and the average decreases for service level earthquake(SLE),design basis earthquake(DBE) and the maximum considered earthquake(MCE) are about 20%,indicating that the seismic performance is significantly improved by retrofitting.The inter-story drift ratios of the retrofitted structure under SLE,DBE and MCE are consistent with the design values,illustrating that the expected inter-story and roof drift ratio targets are achieved,which verifies the effectiveness of the proposed method.The damper designed by the proposed method remains elastic state overall during frequent earthquakes,and enters yielding state during DBE and MCE,realizing the expected energy dissipation mechanism.The ductility demand of the damper is evenly distributed along the height,which further indicates the rationality of the design method.The presented research can provide important reference to the seismic retrofitting design of the existing building structures.
作者
翟治鹏
刘彦辉
周福霖
ZHAI Zhipeng;LIU Yanhui;ZHOU Fulin(Earthquake Engineering Research&Test Center,Guangzhou University,Guangzhou 510006,China;State Key Laboratory for Seismic Reduction/Control&Structural Safety(Cultivation),Guangzhou University,Guangzhou 510006,China;Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology,Guangzhou University,Guangzhou 510006,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2024年第2期1-9,共9页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(52308309)
广东省基础与应用基础研究基金项目(2023A1515011914,2022A1515110191)。
关键词
既有建筑
抗震加固
能量平衡
性能化设计
消能减震
existing buildings
seismic retrofit
energy balance
performance-based design
energy-dissipated vibration mitigation
作者简介
翟治鹏(1990-),男,副教授,博士,主要从事工程结构抗震减震研究。E-mail:zhipengzhai@gzhu.edu.cn;通讯作者:刘彦辉(1980-),男,教授,博士,主要从事工程结构减震控制研究。E-mail:Liuyanhui2012@163.com。
