铁路大跨桥梁新型高墩抗震性能研究

Research on Seismic Performance of Neotype Tall Pier for Long-span Railway Bridges

结合黄陵—韩城—侯马铁路可行性研究中的大浴河特大桥主桥的方案研究,提出了一种新型铁路高墩———四柱式桥墩.分析表明,在只研究桥墩刚度时,四柱式桥墩可以采用常用的梁单元进行建模.在具有相同自振特性的前提下,分别采用抛物线形及直线形的四柱式桥墩的主桥,其桥墩混凝土的用量相对于传统矩形空心墩,要分别减少约15%及20%.由于四柱式桥墩混凝土用量的减少及在构造上允许墩柱间隔板开裂,其抗震性能优于矩形空心墩.

With the project study on Dayuhe Bridge of Huangling-Hancheng-Houma Railway in course of feasibility study,a new type of railway high-pier（four-pillar pier）was introduced. It was found that beam element could 13e used in course of modeling about the four-pillar pier when paid more attention to the stiffness of the pier. Under the premise of the same vibration characteristics, the masonry work of the bridge which has four-pillar pier with parabola or line shape has reduced about 15% or 20% compared with the bridge which has traditional rectangular hollow pier. The seismic performance of four-pillar pier bridge was superior to the bridge with rectangular hollow pier because the reduction of concrete and the permission of cracking.