连续刚构桥施工监控截面应力分析

Stress Analysis of Continuous Rigid Frame Bridge in Construction Monitoring

悬臂施工属于典型的自架设施工方法,在施工过程中的已成结构(悬臂节段)状态是无法事后调整的,因此施工控制时要采用预测反馈控制法。对于主梁内力(或应力)的调整,只能通过严格控制预应力束张拉力的大小来实现。对于主梁线形的调整,调整立模标高是最直接的手段。对于参数误差以及其他因素引起的主梁标高的变化,通过调整立模标高进行修正。

Cantilever construction belongs to the typical self erection method,the structure state（cantilever segmental）in the construction process is unable for post-adjustment,so in the construction control we should use the prediction feedback control method. The adjustment of the internal force（or stress） in beam,can only be realized through strict control of the tensioning force in pre-stressed tendons. For a good alignment,adjusting the elevation of formwork is the most direct way. The changes of elevation caused by parameter error and other factors can be modified through the adjustment of vertical mold elevation.