某空心板梁桥垮塌原因分析及应急抢修方案探讨

Analysis of the Collapse Cause of a Hollow Slab Beam Bridge and Discussion on Emergency Repair Plan

摘要:

针对武汉市长丰桥引桥空心板垮塌事故进行了有限元分析。整体模型分析表明，在实际超重车辆荷载的作用下，空心板主梁的抗弯、抗剪承载力均超出结构安全范围，存在空心板主梁折断的风险；局部实体模型分析表明，在实际超重车辆荷载的作用下，桥面板的混凝土拉应力已远远超出限值，且桥面混凝土产生大面积开裂，存在桥面板局部塌陷的风险。详细介绍了事故处理的应急抢修方案，该方案可极大地节省工期，且具有很强的实施性，根据后期的持续监测，维修效果较好。该方法可为同类事故处理提供参考。

Abstract:

Based on the collapse accident of the hollow slab of the Changfeng Bridge approach bridge in Wuhan，the finite element analysis was established.The overall model analysis shows that under the actual overweight vehicle load, the bending and shear bearing capacity of the hollow slab main beam exceed the structural safety range, and there is a risk of the hollow slab main beam breaking. Local entity model analysis shows that under the actual overweight vehicle load, the tensile stress of the concrete on the bridge deck has far exceeded the limit, and the concrete on the bridge deck has undergone extensive cracking, posing a risk of local collapse of the bridge deck.At the same time, a detailed emergency repair plan for accident handling was introduced, which can greatly save construction time and has strong implementability. Based on continuous monitoring in the later stage, the repair effect is very perfect. This method can provide reference for handling similar accidents.