钢支撑-混凝土框排架结构抗震性能试验及有限元分析

Seismic performance experiment and finite element analysis of steel brace-concrete frame bent structure

以某600MW级火力发电厂主厂房为背景,通过试验和有限元分析研究了钢支撑-钢筋混凝土框排架的抗震性能,同时研究了混凝土柱构造设计的改进对结构抗震性能的影响。以某钢支撑较少的横向框排架为研究单元,以1∶10比例设计缩尺模型,通过拟静力低周反复加载试验,观察结构试验现象、破坏机制,并绘制滞回曲线、骨架曲线、刚度退化曲线等。试验结果表明:结构滞回曲线呈饱满梭形,结构具有良好的抗震性能,结构的耗能能力、阻尼比与延性较高。钢支撑受压弯可屈服,存在P-Δ效应,在结构由第一道抗震防线转入第二道抗震防线过程中提供了抗侧刚度和抗剪承载力,并具有耗能能力。使用ABAQUS有限元软件建立了实体模型,模拟了结构模型的滞回曲线、骨架曲线以及混凝土损伤状态,与试验结果吻合良好。

Taking the main building of a 600 MW thermal power plant as the background, the seismic performance of steel brace-concrete frame bent was studied by experiment and finite element analysis, and the effect of improving the structural design of concrete column on the seismic performance was studied. A transverse frame bent with less steel brace was selected as the research unit. The scale model was designed with 1∶10 ratio. Through the pseudo-static repeated loading test, the phenomenon and failure mechanism of the structure test were observed, and the structure hysteretic curve, skeleton curve and stiffness degradation curve were drawn. The test results show that the hysteretic curve of the structure is full shuttle shape and has good seismic performance. The energy dissipation capacity, damping ratio and ductility of the structure are high. The steel brace can yield under compression and has P-Δ effect. In the process of the structure from the first line of defense to the second line of defense, it provides lateral stiffness and shear capacity, and has energy dissipation capacity. Using ABAQUS finite element software, the solid model was established, and the hysteretic curve, skeleton curve and concrete damage state of the structure model were simulated, which are in good agreement with the test results.