近场地震下简支梁桥的碰撞响应研究

近场地面运动有显著的改变结构响应的特点，使结构产生较大的内力和位移。由于简支梁桥存在着梁体伸缩缝，在近场地震作用下因相邻两跨梁之间或是梁与桥台之间运动的不协调导致发生碰撞，这种碰撞现象可能会造成梁体的脱落。研究了碰撞现象对桥梁结构产生的不利影响，认为对固定铰支座的影响很大，在支座设计时应予重视。

Study on Impact Response of Bridges with Simply-supported Beams under Near-field Earthquake

The neat-fault ground motion can dramatically influence response characteristic of the structures.And it can increase the internal force and the displacement of the structures.Because simple supported beam bridges have the expansion joints,the pounding will happen between adjacent beams or beams and abutment.And the pounding can cause beams falling.In this paper,the effect caused by pounding to the bridges was studied.The conclusion was draw that the pounding between two decks have heavy influence on the fixed pin bearings.This fact had not been noticed for a long time in the bridges designing.