部分填充圆形钢管混凝土桥墩子结构拟动力试验

摘要

In order to investigate the nonlinearity dynamic performance of partially concrete-filled circular steel bridge pier under El and E2 ground motion in bridge system,the paper analyzes the seismic performance of circular steel bridge pier with partially concrete-filled based on the method of combining with experimental and numerical analysis. It inputted EL CENTRO earthquake wave and Japan Kobe JRT-NS earthquake wave as the El and E2 ground motion. These reaction displacement and horizontal hysteresis force-displacement curves were obtained from the experiment. These results reveal that the bridge pier with partially concrete-filled keeps in the elastic stage under the El ground motion,and the bridge pier enters plasticity without significant damage under E2 ground motion and it shows better seismic performance. It also reveals that the experimental method is effective for proving the influence of the key component to the mechanics properties of the bridge.%目的 探明在整体桥梁中部分填充圆形钢管混凝土桥墩在E1和E2地震动作用下的非线性动力性能,提出合理的桥墩抗震设计.方法 通过桥墩柱的子结构拟动力试验研究,了解整个桥梁结构的受力特点,利用试验和数值分析相结合的方法,对部分填充圆形钢管混凝桥墩在整体桥梁上的抗震性能进行分析.其中E1和E2地震动分别输入EL CENTRO波和日本神户地震JRT-NS波等两种工况.结果 得到了在这两种工况作用下试验子结构桥墩的反应位移和水平力-位移滞回曲线.数据曲线表明了桥墩模型在E1和E2地震作用下的破坏情况与试验结果能够较好吻合.结论 表明在E1地震动作用下桥墩处于弹性状态,在E2地震作用下桥墩处于弹塑性状态,没有明显的破坏迹象,表现出良好的抗震性能.该试验方法对于探明关键构件对桥梁等整体结构力学性能影响的有效性.