深圳市留仙大道跨丽水东路桥检测评估

深圳市留仙大道跨丽水东路桥上部结构采用30 m预应力混凝土空心简支板梁,施工完成后发现边板外侧存在比较严重的裂缝。介绍对梁体进行的检测、荷载试验,以及对桥梁上部结构及开裂截面的实际受力状况的分析。结果表明:边梁由于截面横向不对称而产生的斜弯曲是其外侧出现开裂的主要原因,这些裂缝不影响上部结构的整体刚度、受力状况及结构承载能力,对截面的局部应力状况有一定影响。

Inspection and Evaluation of Liuxian Avenue Bridge over Lishui East Road, Shenzhen City

The superstructure of Liuxian Avenue Bridge over Lishui East Road,Shenzhen City is designed as a 30-m span prestressed concrete simply-supported hollow slab beam structure.After construction of the superstructure was completed,rather severe cracks were found at the outer sides of the edge slab beams.In this paper,the inspection,load tests for the beams and analysis of actual mechanical behavior of the superstructure and cracked sections thereof are presented.The results of the inspection,tests and analysis indicate that the skew curving due to transverse asymmetry of the sections is the principal cause leading to the cracks of the slab beams.These cracks will not cause influences on the global rigidity,mechanical behavior and carrying capacity of the superstructure,however,it has a certain influence on the local stress conditions of the sections.