预制系梁与柱式墩连接节点力学性能分析

FINITE ELEMENT ANALYSIS OF MECHANICAL PERFORMANCE OF THE CONNECTION BETWEEN PRECAST TIE BEAM AND COLUMN PIER

我国西部地区地形多为高山峡谷,桥梁下部结构多采用带系梁的双柱式桥墩作为受力构件,为了研究预制钢系梁和混凝土现浇系梁与柱式墩连接位置的节点受力性能,设置了3种类型系梁,利用ABAQUS软件建立有限元模型,进行拟静力试验。通过在盖梁中心施加竖向荷载和水平往复位移,从6个方面研究预制钢系梁和混凝土现浇系梁与双柱式桥墩的节点受力性能。结果表明:混凝土现浇系梁的抵抗变形能力和耗能能力略强于钢材预制系梁,而钢材预制系梁可以更好地减缓刚度退化和抵抗变形,减小地震产生的破坏。

The terrain in the western part of China is mostly high mountains and valleys,and the bridge substructure mostly adopts double-column piers with tie beams as the stressed members.In order to study the joint performance of steel prefabricated tie beams and concrete cast-in-place tie beams and column piers,three types of tie beams are set up,and the finite element model is established by ABAQUS software for quasi-static test.By applying vertical load and horizontal reciprocating displacement in the center of the cover beam,the joint performance of steel precast tie beams and concrete cast-in-place tie beams and double-column piers was studied from six aspects.The results show that the resistance to deformation and energy dissipation of concrete cast-in-place tie beams are slightly stronger than that of steel precast tie beams,and steel precast tie beams can better reduce stiffness degradation and deformation resistance,and reduce the damage caused by earthquakes.