论文部分内容阅读
为研究薄钢板组合PEC柱(强轴)-削弱截面钢梁组合框架的层间抗震性能,设计制作1榀组合框架中间层子结构1∶2缩尺试件并对其进行水平循环往复荷载抗震试验.基于试验现象和测试数据整理,得到了试件破坏模式与滞回特征曲线,并对试件水平抗侧刚度、耗能性能和变形模式等进行了分析.研究结果显示:采用梁端截面削弱方式可通过梁端塑性铰形成位置偏离节点区以满足“强节点”的抗震要求;试件整体与层间中间层位移延性系数分别大于4.05和4.81,对应等效粘滞阻尼比最大值分别为0.288和0.286;试件结构水平抗侧刚度沿高度均匀分布,侧移变形呈理想倒三角弯剪型侧移变形模式;试件结构破坏模式为梁端削弱截面充分屈服形成塑性铰的理想塑性破坏机构,且其承载力下降到极限承载力85%时,对应试件整体与层间侧移角分别为0.043 3 rad和0.039 4 rad,相应超过框架结构大震层间侧移限值0.035 0 rad,说明试件结构具有良好的抗震延性.
In order to study the anti-seismic performance of the thin steel plate composite PEC column (strong axis) - to weaken the interlaminar seismic behavior of the cross-section steel beam composite frame, a 1: 2 scale specimen of the middle sub-structure of 1 榀 composite frame was designed and subjected to horizontal cyclic reciprocating load Based on the test phenomena and the test data, the failure modes and the hysteresis curves of the specimens were obtained, and the lateral stiffness, energy dissipation performance and deformation modes of the specimens were analyzed.The results show that: The way of weakening can be offset from the node area by the plastic hinges at the beam ends to meet the seismic requirements of the “strong node”. The displacement ductility coefficients of the whole specimen and the interlayer are greater than 4.05 and 4.81 respectively, corresponding to the maximum equivalent viscous damping ratio The values are 0.288 and 0.286, respectively. The structural lateral stiffness of specimens is evenly distributed along the height, and the lateral displacement is in the form of ideal inverted bending and shear deformation. The structural failure mode of the specimen is that the beam ends weaken and the yielding plastic hinge Ideal plastic failure mechanism, and its bearing capacity down to the ultimate bearing capacity of 85%, the corresponding specimen overall and interlayer displacement angle of 0.043 3 rad and 0.039 4 rad, respectively, over the framework of large earthquake The lateral drift limit value is 0.035 0 rad, which shows that the specimen structure has good seismic ductility.