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为了提高钢筋混凝土框架结构的抗震性能,针对传统支撑受压屈曲的问题,建立了新型屈曲约束支撑和框架结构相结合的结构体系。采用ANSYS有限元软件对安装和不安装屈曲约束支撑混凝土框架在水平往复加载下的抗震性能进行了非线性分析,并与拟静力试验结果进行对比。结果表明:安装屈曲约束支撑框架的承载力较普通无撑框架提高了50.75%;同一位移量级下有撑框架的滞回环面积明显增加,有撑框架的最大耗能是无撑框架的2.97倍;ANSYS有限元模拟结果与拟静力试验结果的误差可以控制在3.40%~17.84%之间,有限元模拟与试验结果吻合较好。在有更强的塑性变形能力的屈曲约束支撑对框架结构的抗震性能有很好的增强作用,相比无屈曲约束支撑的框架结构而言,其滞回曲线较为饱满,混凝土梁中钢筋先于混凝土压碎而发生屈服,属于典型的梁铰破坏机制。
In order to improve the seismic performance of reinforced concrete frame structure, a new type of structural system combining buckling restraint brace and frame structure is established to solve the problem of buckling under the traditional support. The ANSYS finite element software is used to analyze the seismic behavior of concrete frame with and without buckling restraint under horizontal reciprocating loading. The results are compared with the results of quasi-static test. The results show that the bearing capacity of the buckling-restrained support frame is increased by 50.75% compared with that of the ordinary braceless frame. The area of the hysteresis loop of the braceped frame with the same displacement is obviously increased, and the maximum energy consumption of the brace with brace is 2.97 times The error between ANSYS finite element simulation results and quasi-static test results can be controlled between 3.40% and 17.84%, and the results of finite element simulation agree well with the experimental results. In the case of buckling restrained brace with stronger plastic deformation capacity, the seismic performance of the frame structure is better than that of the frame structure without buckling restraint, the hysteresis curve is more full, Concrete crushing and yielding, is a typical beam hinge failure mechanism.