针对高强钢结构在抗震设计中存在的结构延性差、刚度小的问题，提出了高强钢框架-屈曲约束支撑结构。为研究此类结构的抗震性能，对2个足尺单榀单跨单层试件进行了拟静力加载试验，观测了结构在水平往复荷载下变形特征与破坏模式，分析了结构及构件滞回曲线特征，探讨了试件强度退化、刚度退化、塑性变形、耗能能力以及钢框架和屈曲约束支撑的承载力分配和耗能分配。结果表明：高强钢框架-屈曲约束支撑结构滞回性能稳定，塑性变形及耗能能力强，最大水平层间位移角达3%，最大等效阻尼比达30.4%~36.3%。试件破坏模式为整体延性破坏，最终失效模式为柱底翼缘严重局部屈曲以及柱底焊缝撕裂。水平荷载由钢框架与屈曲约束支撑共同承担。当水平位移角在1.5%以内时，塑性变形集中于屈曲约束支撑，钢框架塑性变形仅占总变形的3%~5%，塑性损伤较小，可通过性能化设计方法将结构的塑性变形限制与屈曲约束支撑，可实现震后快速修复。当层间位移角在1.5%以内时，屈曲约束支撑耗能占结构总耗能的95%以上。采用ANSYS建立了相应的有限元模型，有限元分析结果与试验结果吻合较好，验证了有限元模型的有效性。
Abstract
High-strength steel frame with buckling restrained brace was proposed for the defects of high-strength steel in seismic application including poor ductility and low stiffness. Two full-scale single-span single-layer specimens were tested under quasi-static loading to investigate the seismic behavior of this structure. The deformation characteristics and failure mode of the structure under horizontal cyclic load were observed. The deformation characteristics and failure mode of the structure under horizontal loading were observed. The hysteretic curves of the structure and the components were analyzed and the load degradation, stiffness degradation, plastic deformation, energy dissipation capacity, horizontal force distribution and energy dissipation distribution were discussed. The results indicated that the hysteretic curves of the specimens were plentiful and stable. The plastic deformation capacity and energy dissipation capacity of the specimens were excellent with the maximum inter-story drift ratio to be 3% and equivalent damping ratio to be 30.4% ~ 36.3%. The horizontal loads were resisted by the steel frame and the buckling restrained brace together, while almost all the energy was dissipated by the buckling restrained brace. The failure mode of the specimen was buckling of the column flanges and fracture of the weld at the bottom of the column. The plastic deformation of steel frame was rather small, which was beneficial to repair after earthquake. Finite element model (FEM) was established by ANSYS. The results by FEM were in good agreement with the test results, which verified the effectiveness of the FEM.
关键词
高强钢 /
屈曲约束支撑 /
拟静力试验 /
有限元分析 /
抗震性能
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Key words
High strength steel /
Buckling restraind brace /
Pseudo-static test /
Finite element analysis /
seismic behavior
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