梁桥搁置长度的计算方法比较

梁桥的搁置长度是在桥梁上下部结构之间产生大的相对变位时，为防止上部结构脱落而需要确保的梁端到下部结构边缘的距离。通过修改桥梁参数，对计算梁桥搁置长度的反应谱法和静力法进行对比，分析2种方法产生差异的原因。研究表明，静力法不需考虑桥墩延性系数的变化和阻尼系数的影响，计算简单，适合于设计使用。

Comparison of calculation methods for adequate seated length of beam bridge

The collapse resistant systems of bridges are made of unseating prevention devices, seismic restrainers and adequate seated length. The adequate seated length is necessary to prevent collapse when the relative displacement between superstructure and substructure is too large. In this paper, two methods including response spectrum-based approach and static-based approach are compared with many types of bridge models, the differences between the two methods are discussed. The ductility factor and damping influence coefficient of piers need not be considered in static method, this method is simple and can be used easily.