摘要
以某高速公路上3座桥梁为背景,采用空间有限元软件建立弹性有限元分析模型,对各类裂缝发生机理进行影响前后的模拟。根据模拟应力结果,结合桥梁检测数据对箱梁裂缝病害进行分析。结果表明,竖向预应力损失及梯度温度效应是导致薄壁箱梁裂缝产生的主要原因,偏载及超载仅能判断与腹板出现的裂缝有关。
In order to analysis the causes of cracks in Large Span Continuous Rigid Frame old Bridge, taking three bridges on the highway as background, the finite element analysis model is established by using the space finite element software, and various fracture mechanisms are simulated. According to the simulation results of the stress and the bridge detection data, cracks in box girder are analyzed. The results show that the vertical prestress loss and the temperature gradient effect are the main cau- ses of cracks in thin-walled box girder, partial load and over load can only judge the cracks in the web.
出处
《交通科技》
2014年第4期49-52,共4页
Transportation Science & Technology
关键词
连续刚构桥
温度梯度
竖向预应力
裂缝
large span continuous rigid frame Bridge
temperature gradient
vertical prestress
cracks
