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基于Opensees程序对原框架和增设改进型双钢管约束屈曲支撑加固的钢框架进行Pushover分析和非线性时程分析,对两者的抗震性能进行比较。得出以下结论:加固后的钢框架刚度和强度明显提高,顶层侧移比减小而底部剪力比增加较小;地震作用下,加固后的框架破坏程度远小于原框架,所产生的塑性铰主要集中在中间跨梁和支撑处,避免了其他构件发生破坏。说明对原框架增设改进型双钢管约束屈曲支撑加固,可提高结构的抗震性能。
Based on the Opensees program, Pushover analysis and nonlinear time-history analysis of the original frame and the steel frame strengthened by the improved double-steel tube restrained buckling brace are carried out, and the seismic performance of the two are compared. The conclusions are as follows: The stiffness and strength of the steel frame strengthened obviously, the displacement ratio of the top layer decreases and the shear force ratio of the bottom increases less; under the seismic action, the damage of the reinforced frame is far less than the original frame, Hinge mainly in the middle of the beam and support at the bridge to avoid the destruction of other components. It shows that the improved double steel tube restrained buckling support reinforcement to the original frame can improve the seismic performance of the structure.