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Y形高强钢组合偏心支撑框架结构(YEBF)的耗能梁段采用屈服点较低的钢材,框架梁、柱采用高强度钢材,采用高强钢可有效减小构件截面,节约钢材,降低造价。现行设计规范中偏心支撑结构基于弹性理论进行设计,采用内力放大系数的方法保证结构在罕遇地震下耗能梁段进入塑性,其他构件保持弹性,结构的弹塑性变形可能过于集中而出现薄弱层。该文提出了采用基于性能设计方法(PBPD)设计剪切屈服型耗能梁段YEBF结构(S-YEBF),以目标位移和理想的整体破坏模式为作为预测和控制结构弹塑性受力状态的性能目标,保证结构在罕遇地震作用下各层耗能梁段均能参与耗能,使结构层间侧移角分布趋于均匀,避免出现薄弱层。根据PBPD方法设计了多层S-YEBF结构,对其1/2缩尺模型进行了振动台试验以评估其抗震性能。通过非线性静力推覆分析和动力时程分析对比了分别采用PBPD方法和传统设计方法设计的10层S-YEBF结构算例的抗震性能。结果表明:采用PBPD方法设计的S-YEBF结构具有良好的抗震性能,结构呈较为理想的整体破坏模式,在罕遇地震作用下,各层耗能梁段均参与耗能,层间侧移角沿结构高度方向分布较均匀;与传统设计相比,PBPD方法设计的S-YEBF结构层间侧移角分布更均匀,并且可节省一定的钢材;PBPD设计方法可以为S-YEBF结构的工程设计提供参考。
YEHF composite eccentric support frame structure (YEBF) energy beam section with a lower yield point of steel, frame beams, columns using high strength steel, the use of high strength steel components can be effectively reduced cross-section, saving steel and reduce costs. In the current design specifications, the eccentric support structure is designed based on the elastic theory. The internal force amplification factor is used to ensure that the structure enters the plasticity under the rare earthquakes and the other components remain elastic. The elastic-plastic deformation of the structure may be too concentrated and the weak layer . In this paper, we design a shear yielding energy beam section YEBF based on the performance-based design method (PBPD) to predict and control the elastic-plastic state of the structure with the target displacement and the ideal total failure mode PERFORMANCE OBJECTIVES AND GUARANTEED STRUCTURE Under the action of rare earthquakes, the energy dissipation beam sections in all layers can participate in energy dissipation, and the lateral migration angle distribution of the structural layers tends to be uniform, avoiding the occurrence of weak layers. Based on the PBPD method, a multi-layer S-YEBF structure was designed and its shaking table test was performed on a 1/2 scale model to evaluate the seismic performance. The seismic performance of a 10-story S-YEBF structure with PBPD method and traditional design method was compared by nonlinear static nappe analysis and dynamic time history analysis. The results show that the S-YEBF structure designed by the PBPD method has good seismic performance and the structure is an ideal failure mode. Under rare earthquakes, the energy dissipation beam sections of all layers are involved in energy dissipation. Compared with the traditional design, the lateral displacement angle of S-YEBF structure designed by PBPD method is more uniform and a certain amount of steel can be saved. The PBPD design method can provide a reference for engineering design of S-YEBF structure .