带锚栓的加劲板式橡胶支座使用阶段的水平刚度

Horizontal stiffness of laminated rubber bearings with anchor bolts

在大跨度柱支承钢网格结构的橡胶支座中设置锚栓,能有效防止屋盖在极端情况(如罕遇地震、负风压)下脱离出支承柱。为了不妨碍橡胶垫在正常使用条件下变形,在锚栓和锚孔之间留有与该变形相适应的净距。本文分析这类支座在橡胶垫与锚栓接触前后的水平刚度。与支座变形相一致,进行了接触问题的近似分析,得到了一个便于计算机编程的刚度函数算式。一个四柱支承大跨度预应力浅网壳结构的有限弹性变形分析表明,锚栓对计算结果影响较大。

Setting anchor bolts in laminated rubber bearings of large span column supported steel latticed structures can efficiently prevent the roofs from disengaging from the supporting columns in exceptional cases (e.g. seldom occurred earthquake, wind suction). In order not to obstruct the deformation of the rubber pads under normal service loads, there is an appropriate clearance between each bolt and the corresponding wall of bolt hole in the rubber pads. This paper analyzes the horizontal stiffness of the bearing just before and after the rubber pad is in contact with the bolts. In agreement with the bearing deformation, approximate contact analysis is made with a simplified stiffness function formula obtained which is beneficial to computer programming. Finite elastic deformation analysis of a four column supported prestressed latticed shallow shell roof shows that the bolts have influence upon the computed results more significantly.