建筑结构学报2025，Vol.46Issue(1)：111-123,13.DOI:10.14006/j.jzjgxb.2023.0862
某超高层RC剪力墙结构的实测远场地震反应
Monitored responses of a high-rise residential building of RC shear wall structure to distance earthquakes
摘要
Abstract
The actual seismic response of structures and structural dynamic characteristics under seismic excitation are crucial foundations for seismic analysis and design of structures.Based on the monitoring data obtained from a super-tall building over 160 m in height during two distant earthquakes and environmental excitations,the first two orders of frequencies and the first-order damping ratio were identified using the stochastic subspace identification(SSI)method.The acceleration,velocity,and displacement responses of the structure under earthquake action were analyzed.Compared to environmental excitations,the fundamental period of the structure under seismic excitation lengthens with the increase of amplitude,and the first-order damping ratio significantly increases with the amplitude,and can return back to the pre-seismic values after the earthquake,indicating nonlinear elasticity.Besides,the fundamental period used in seismic design is notably greater than the identified values in the earthquake events,with a relative error exceeding 40％in the short side direction,which is deemed unsafe for seismic design.The identified damping ratios of the structure under seismic excitations are approximately 1.2％and 1.6％in the two principal directions,respectively.These values correspond to the testing results for high-rise buildings in the United States but much lower than the recommended value of 5％for reinforced concrete structures in current Chinese code for seismic design of buildings,suggesting that the damping ratio values recommended by the Chinese codes may be too high.The peak floor acceleration and velocity of the structure during the two distant earthquakes amplify with the increase in building height,with significant contributions from higher-mode responses,and the amplification factors significantly exceed the recommended values in Chinese codes.The seismic displacement response of the structure is characterized by bending deformation,with inter-story drift far less than the code limits.关键词
超高层建筑/动力特性/随机子空间法/地震反应/阻尼比Key words
super high-rise building/dynamic characteristics/stochastic subspace identification/seismic response/damping ratio分类
土木建筑引用本文复制引用
范涛,曲哲,杨江,刘晓辉,郭学卫..某超高层RC剪力墙结构的实测远场地震反应[J].建筑结构学报,2025,46(1):111-123,13.基金项目
国家自然科学基金优秀青年科学基金项目(52122811),地震科技星火计划(XH231702YB),中国地震局地震研究所和应急管理部国家自然灾害防治研究院基本科研业务费专项资助项目(IS202216317),湖北省重点研发计划项目(2022BAD059). （52122811）
