悬索桥在受到移动荷载和地震引起支座运动下的反应

中文字数:4054,中文页数:12  英文字数:3286 页数:26

Abstract
 This is a bridge on Tonghuo road which crosses railway. And the road direction has an angle of 70°with the railway, so this bridge is designed to be a skew bridge.
 Firstly, the simply supported Bridge of prestressed concrete is determined. Then detailed dimension is decided and check the dimension whether is appropriate.
 Secondly, calculate the action effect of dead loads and live loads. Here the load transverse distribution factors of all the beams are needed to calculate and the control cross section internal forces of main span’s side beam is needed to calculate. The other beams and cross section internal forces can be by meams of Bridge Doctor.
 Thirdly, according to the internal forces which caculated before, I can arrange the steel tendons and calculate the prestressing losses of tendons. Then check the bearing capability of endurance status, check the anti-crack of endurance status,check the stress of endurance status, check the stress of brevity status, check local bearing capability, check deformation of the beam. After the checking by hand, model the bridge in Bridge Doctor and compare the results with the results by hand.
 Fourthly, calculate the substructure, include the choice of bearing, the intenal force of the capping beam pier and pile.
 The special topic is Design of Anticollision Wall.
Translation topic is Suspended bridges subjected to moving loads and support motions due to earthquake.
 Keywords: Bridge design, Prestressed Concrete, Skew bridge, Study of Bridge Doctor

摘要
 本文主要研究悬索桥在移动荷载和地震引起的支座运动联合作用下的振动。基本的微积分方程是基于一个悬索梁得出的。车辆荷载的动力效应被等效成一排等间距的移动荷载，地震作用由支座的竖向运动来代替。控制方程的解是由一个齐次方程的通解加一个特解得出的。另外，也参照了世界上最大的悬索桥—墨西拿大桥（中心跨径3.3km）的设计。本文研究了地震波不同时刻到达的影响，因为我们不知道地震会在汽车沿一个大跨度桥梁运动到什么位置而到来。计算时用到了典型的神户大地震记录的地震波。结果表明移动荷载和地震作用两者的影响可能会扩大大跨度悬索桥的反应。

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