全钢装配式屈曲约束支撑有限元分析及试验对比

FINITE ELEMENT ANALYSIS AND EXPERIMENT COMPARISON OF ALL-STEEL ASSEMBLED BUCKLING-RESTRAINED BRACE

基于Q195全钢装配式屈曲约束支撑抗震性能试验的研究成果,采用ABAQUS有限元软件对试验构件进行数值分析,对屈曲约束支撑芯材采用金属双线性随动硬化模型,得到的有限元分析结果与试验结果接近。最后通过改变屈曲约束支撑的间厚比、宽厚比、材性和长细比,研究其对全钢装配式屈曲约束支撑耗能性能的影响,分析结果表明:随着芯材间厚比的增加,试件荷载-位移曲线振荡加剧;随着芯材宽厚比的增大,试件进入塑性后的荷载-位移曲线越平缓;以Q195钢为芯材的屈曲约束支撑滞回性能比Q235B钢好;随着芯材弱轴方向长细比的增大,试件的刚度在弹性段和塑性段均减小。

Based on the research findings of the aseismic performance of Q195 all-steel assembled buckling- restrained brace, the numerical analysis was carried out by using ABAQUS software, and the metal bilinear kinematic hardening model was applied in the core of buckling-restrained brace. Compared with the experimental results, the finite element analysis results showed a good agreement with the test data. Finally by changing the clearance-to- thickness ratio, width-to-thickness ratio, material and slenderness ratio of buckling-restrained brace, the effects of those parameters on the dissipation capacity of all-steel assembled buckling-restrained brace was investigated. The results showed that with the increase of clearance-to-thickness ratio of core, load-displacement curve of specimens became stronger vibrating; with the increase of width-to-thickness ratio, the load-displacement curve became flatter the plastic stage; the hysteretic performance of Q195 steel was better than Q235B steel as the core material of the buckling constraints supporting; as the core weak axis of slenderness ratio was increased, the stiffness of the specimens decreased in elastic and nlastie.