深埋式混凝土桥头搭板结构计算分析

传统的浅埋式桥头搭板在使用过程中常会出现板底脱空甚至断裂的问题。以深埋式桥头搭板处治结构为主要研究对象,通过有限单元法分别建立深埋式、浅埋式桥头搭板力学模型,并运用Winkler弹性地基梁理论对两种搭板结构进行对比验算。结果表明:相对于浅埋式桥头搭板结构,采用深埋式桥头搭板处治结构可以有效减小台背地基沉降、搭板挠曲变形和板底应力,增强地基刚度,从而缓解桥头跳车和桥头搭板断裂问题。

Structural Calculation and Analysis of Deep-buried Concrete Approach Slab

The traditional shallow-buried approach slabs during service offen occurs fallure, and even breakage under the approach slab. This paper takes the deep-buried approach slab as study object, uses finite element method to set up a mechanical model respectively for shallow and deep-buried approach slabs and utilizes the Winkler elastic foundation beam theory to make a comparison of the two slab structures thereof. The results show that:compared with the shallow-buried approach slab structure, the use of deep-buried concrete approach slab can effectively reduce abutment foundation settlement, plate deflection and slab bottom stress, enhance foundation stiffness, and thus relieve such problems as bridge jumping and the approach slab fracture.