连续刚构桥底板崩裂事故的评析

Analysis of Accident of Bursting Crack in Bottom Slab of a Continuous Rigid-Frame Bridge

针对某连续刚构桥在施工过程中发生的底板崩裂事故,通过全面的计算,分析事故原因,确认在张拉跨中合龙束时底板崩裂是由合龙束产生的径向下崩力所致;并对该桥型类似问题进行剖析,给相关设计提供参考和建议。

For the accident of bursting crack occurring in bottom slab of a continuous rigidframe bridge at construction stage, this paper analyzes the causes leading to the accident through all-round and thorough calculation, and confirms that the bursting crack was caused by radial downward bursting force coming from closure prestressing strands at the time the strands at midspan were tensioned. Meanwhile, the paper also analyzes problems of the type of the bridge similar to the accident mentioned above with an aim to providing references and suggestions to the design related to.