大吨位压剪盆式橡胶支座及其连接的原型试验研究

Experiments on large-tonnage compression-shear pot-type elastomeric pad bearings and connections

天津海河蚌埠桥的各个支座都具有独特的受力特点,其中2#、5#墩支座三是特殊设计的大吨位压剪盆式橡胶支座,不仅需要承担竖向荷载,还要承担巨大的水平荷载作用,不同于以往的普通支座。因此,必须对支座及其锚固构造进行试验研究,确保支座构造合理且能满足结构承载要求。设计了普通千斤顶和预应力方式组合加载的试验方案,对2#、5#墩支座三进行足尺模型试验研究,得到支座竖向压缩变形、支座盆环径向变形等随加载历程而变化的规律。试验结果表明,该支座在达到和超过设计荷载时没有损坏,锚固构造未出现异常现象,相关监测数据满足规范要求。最后利用ANSYS对支座进行有限元分析,分析比较试验值与理论计算值。研究表明该支座具有较好的受力性能。

Abstract： The Tianjin Hai River Bengbu Bridge is composed of ansymmetric longitudinal-lateral arch structures. The load-bearing behavior of each of the supports is distinctive from one another. The 3rd supports of the 2nd and 5th piers are designed specially for carrying large-tonnage shearing as welt as compression loads. A full-scale model was established, with a loading scheme combining ordinary jack with prestressing force, to study the static behavior of the 3rd supports of the 2nd and 5th piers of the Bengbu Bridge. A FEA analysis using the ANSYS software was conducted. The study found that the support exhibited high load-carrying and deformation capacities.