带改进型双钢管约束屈曲支撑的钢框架力学性能分析

摘要

Pushover analysis and nonlinear time-history analysis of the retrofitted steel frame structures with im-proved double-tube buckling restrained braces and original steel frame were performed using Opensees and the seis-mic performances were compared.The conclusions are following: the stiffness and strength of the retrofitted steel frame are improved, and the roof drift ratio reduces while the base shear ratio has a little increase;under the earth quake, the degree of damage is far less than that of original steel frame, and the formed plastic hinges mainly con-centrate on the middle beams and brace, avoiding the damages on other members.%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。