斜拉桥合理墩形及墩梁约束体系抗震研究

发布时间：2018-04-25 12:33

本文选题：斜拉桥 + 墩梁约束体系　；参考：《科学技术与工程》2014年32期

【摘要】：过渡墩、辅助墩墩顶设置平衡重是斜拉桥一种常见设计方式,此设计的特点是墩顶所受质量大、但重力小,由此导致过渡墩、辅助墩在地震作用下受到的地震力大、而轴压力小,进而引发过渡墩、辅助墩的动轴拉力、支座动反拉力以及支座剪力过大等抗震问题。以某斜拉桥为背景,针对其过渡墩、辅助墩墩高小的特点,以及纵向+竖向地震作用下,竖向地震作用使辅助墩墩顶支座以及墩底截面产生较大动反拉力和动轴拉力的现象,提出过渡墩以墙式墩取代门式框架墩、辅助墩墩顶支座改为双向滑动支座、过渡墩墩梁之间横向设置速度型动力锁定装置的比选方案。分析表明,此比选方案可有效解决墩中的动轴拉力、支座动反拉力以及支座剪力过大的问题。但是,由于锁定力需求较大,速度型动力锁定装置的选取需根据进一步的经济比选决定。
[Abstract]:It is a common design method of cable-stayed bridge to set balance weight at the top of transition pier and auxiliary pier. The characteristic of this design is that the mass of pier top is large, but the gravity is small, which leads to the transition pier and the auxiliary pier is subjected to great earthquake force under earthquake action. The small axial pressure leads to the seismic problems such as the transition pier, the auxiliary pier's dynamic axial tension, the bearing's dynamic anti-tension force and the support's shear force being too large. Taking a cable-stayed bridge as the background, aiming at the characteristics of the transition pier, the height of the auxiliary pier and the vertical seismic action, the phenomenon that the support at the top of the auxiliary pier and the section at the bottom of the pier have a large dynamic reverse tension and a dynamic axial tension is caused by the vertical seismic action. In this paper, a new scheme is put forward to replace the gate frame pier with the wall pier, the top support of the auxiliary pier is changed into the bidirectional sliding support, and the speed type dynamic locking device is arranged in the crosswise between the pier and beam of the transition pier. The analysis shows that the scheme can effectively solve the problems of the moving shaft tension, the bearing dynamic reverse tension and the support shear force in the piers. However, because of the large demand for locking force, the selection of speed type power locking device should be decided according to the further economic comparison.
【作者单位】：河海大学土木与交通学院;
【分类号】：U448.27

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