方管柱全螺栓拼接节点抗震性能试验研究
Experimental Study on Seismic Performance of Fully Bolted Column-Column Splicing Joints
针对高烈度地区装配式钢结构变电站对框架柱连接节点的高要求,本文设计了一种以角钢为拼接件的新型全螺栓柱柱拼接节点,完成了2个拼接长度不同的柱柱节点试件在压-弯-剪组合工况下的低周往复加载试验,得到了节点的荷载-变形滞回曲线,并提取了骨架曲线,与已完成的单调加载试验曲线进行对比,得到了节点在往复荷载作用下的强度退化现象。采用有限元分析软件对往复加载试验进行数值模拟,将数值分析的结果与试验结果进行比较,验证了数值模型的准确性,最后采用位移延性系数和等效黏滞阻尼系数评价节点的滞回性能。结果表明,与先前的单调加载试验结果相比,往复荷载下节点延性降低(J-6-22降32%、J-6-13降16%),但承载能力降幅小(J-6-22降7%、J-6-13降4%),仍保持较好承载能力。
In response to the high requirements for frame column connection joints in prefabricated steel structure substations located in high-seismic-intensity areas, this paper designs a new type of fully bolted column-column splicing joint using angle steel as the splicing component. Low-cycle cyclic loading tests were conducted on two column-column joint specimens with different splicing lengths under combined compression-bending-shear conditions, and the load-deformation hysteretic curves of the joints were obtained. Subsequently, the skeleton curves were extracted and compared with the completed monotonic loading test curves, revealing the strength degradation phenomenon of the joints under cyclic loading. Finite element analysis software was used to perform numerical simulation of the cyclic loading tests. The numerical analysis results were compared with the experimental results to verify the accuracy of the numerical model. Finally, the displacement ductility coefficient and equivalent viscous damping coefficient were adopted to evaluate the hysteretic performance of the joints. The results show that compared with the previous monotonic loading test results, the ductility of the joints decreases under cyclic loading (Specimen J-6-22 decreases by 32%, Specimen J-6-13 decreases by 16%), while the reduction in bearing capacity is small (Specimen J-6-22 decreases by 7%, Specimen J-6-13 decreases by 4%), and the joints still maintain good bearing capacity.
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