海防路海河大桥桥塔墩桩基抗震设计

重点介绍了海河大桥桥塔墩桩基方案、抗震计算模式、设计计算方法及基础强度验算标准。一般讲，塑性铰区域的出现和正常使用是延性的基础，为保证它的可视性和可修复性，它既不能出现在桥梁的上部结构，又不能出现在基础结构的土层以下部分，而是出现在桥塔墩上，因此桥塔基础应具有与桥塔墩身一样甚至更高的水平承载力及变形能力。文中即采用桩基础的解析模型求出桩基础的水平力一水平位移曲线，再与桥塔墩的水平力--水平位移曲线进行对比的方法，确定出基础强度验算标准，进行设计计算。最后介绍在特大桥中首次采用的延性抗震设计，其特点主要体现在体积含箍率的大幅提高。

Pile foundation aseismic design of bridge tower for the Haihe Bridge

This paper chiefly introduces the pile foundation scheme of the bridge tower, the aseismic computing mode, the design algorithm and the basement strength checking criterion for the Haihe Bridge. Generally, the appear once and normal function of plastic hinge area constitutes a ductility basement. For visible and repairable purposes, the plastic hinge area should be found in the bridge tower pier, but not in the upper bride structure or the base structure under ground. As a result, the bridge tower basement should have the same or stronger horizontal loading and deforming capacity than the pier. In this paper, the horizontal load ~ horizontal displacement curve of the pile foundation is given out by the analytical model of pile foundation. By comparing with the bridge tower pier's horizontal load/horizontal displacement curve, the basement strength checking criterion is determined followed by the design calculation. At the end of this paper,the aseismic ductility design that was adopted for the first time in super\|large bridges was introduced. Its main feature lies in the big increase in the volume hoop rate.