建筑结构学报2025，Vol.46Issue(6)：34-46,13.DOI:10.14006/j.jzjgxb.2024.0299
首层柱中部抬升式受控摇摆钢框架结构抗震性能试验研究
Experimental investigation on seismic performance of controlled rocking steel frame structures with middle-lifted first-floor column
摘要
Abstract
To enhance the self-centering and energy dissipation capabilities of controlled rocking steel frames with base-lifted first-floor columns,a controlled rocking steel frame with middle-lifted first-floor columns is proposed.The structure improves its seismic performance through the mid-level lifting mechanism,post-tensioned steel strands and replaceable tapered steel bar dampers.Four 1/2-scale specimens were subjected to low-cycle reversed loading tests to examine the effects of tapered steel bar cross-sectional dimensions,arrangement quantity and steel strand count on post-yield stiffness,load-bearing capacity,deformation capacity,self-centering ability and energy dissipation performance.The results indicate that the first-story column mid-level lifting mechanism enables the rocking and uplifting of the upper structure,with shear-resisting components effectively transferring horizontal forces.The hysteresis curve of the structure exhibits a dual-flag shape,with sustained improvement in load-bearing capacity.At a roof drift ratio of 2.5％,the residual roof drift ratio remains below 0.2％,with a recovery rate exceeding 90％.The inter-story drift angles are evenly distributed,and both the rocking frame and steel strands remain elastic,while only the tapered steel bar dampers undergo plastic deformation,allowing for rapid post-earthquake repair by replacing the dampers.Under the same initial prestressing force,increasing the number of steel strands enhances both post-uplift stiffness and post-yield stiffness but reduces energy dissipation performance and deformation capacity.The cross-sectional size and arrangement of the steel bars significantly affect post-uplift stiffness and energy dissipation capability.Compared with the base-lifted first-floor columns,the middle-lifted first-floor columns significantly enhance the rotational deformation capacity of the rocking frame.关键词
受控摇摆钢框架/首层柱中部抬升/锥形钢棒阻尼器/拟静力试验/抗震性能Key words
controlled rocking steel frame/middle-lifted first-floor column/tapered steel bar damper/pseudo-static experiment/seismic behavior分类
土木建筑引用本文复制引用
周玉浩,连鸣,苏明周,吴伟豪,戴柏豪..首层柱中部抬升式受控摇摆钢框架结构抗震性能试验研究[J].建筑结构学报,2025,46(6):34-46,13.基金项目
国家自然科学基金项目(52078411,52478205),陕西省创新能力支撑计划-青年科技新星项目(2022KJXX-47),陕西省教育厅青年创新团队科研计划项目(22JP041). （52078411,52478205）
