多层钢框架偏心支撑的抗震性能试验研究  

Experimental studies on seismic performance of multi-storey steel frame with eccentric brace

作　　者：石永久[1] 熊俊[1] 王元清[1] 刘歌青[1] 

机构地区：[1]清华大学结构工程与振动教育部重点实验室,北京100084

出　　处：《建筑结构学报》2010年第2期29-34,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(90815004)

摘　　要：偏心支撑钢框架结构是一种比较理想的多层钢结构抗侧力体系,刚度大,受力性能合理。为了研究偏心支撑钢框架在地震作用下的滞回性能,为多层钢框架偏心支撑结构体系设计提供试验依据,选用耗能梁长度为可变参数,完成了2个不同构造形式的弯曲型耗能梁-偏心支撑框架在水平低周循环荷载下的破坏试验,分析了框架的承载能力及变形特征,研究了框架的破坏模式。研究表明,偏心支撑框架在弹性阶段内具有良好的变形能力,屈服荷载和框架刚度随弯曲型耗能梁长度增加呈下降趋势;偏心支撑框架能够控制框架破坏模式,地震作用下框架在耗能梁段屈服后屈曲破坏,破坏发生在耗能梁端部翼缘和支撑与柱脚连接的节点板位置,降低了梁柱节点受力。The multi-storey eccentrically braced steel frame is an desirable lateral resisting system due to large rigidity and excellent mechanics performance. In order to verify the seismic performance of eccentrically braced steel frame, the hysteretie properties and the energy dissipation capacity were studied by testing two model frames with different length of dissipation beams under horizontal cyclic loading. The resistance and deformation characteristics and the failure patterns of eccentrically braced steel frame were analyzed. The analysis revealed that the eccentrically braced frame has sufficient deformability for earthquake resistant design, and the yield load and the rigidity decrease with the length increase of the dissipation beams. The failure pattern of the eccentrically braced frame can be controlled in an extreme earthquake attack, with yielding of the dissipation beams first followed by lateral buckling. The damage can be limited at the ends of dissipation beams and the continuous plate of the brace, resulting in reduction of the stress concentration at the beam-column joint.

关 键 词：偏心支撑框架 弯曲型耗能梁 拟静力试验 有限元分析 抗震性能 

分 类 号：TU391[建筑科学—结构工程] TU317.1