横向裂缝对PC箱梁结构的影响

Influence of transverse cracks on the bearing capacity of PC box girder structure

针对PC箱梁结构正弯矩区段开裂后力学性能复杂、承载力评估困难的问题,利用裂缝参数统计方法,将正弯矩区段的实际横向裂缝转化为统计意义下的平均裂缝,运用数值方法对该统计裂缝进行模拟,通过对比开裂前后的分析结果,以达到评估开裂结构的目的,并对实际开裂的桥梁进行了对比分析。结果表明,开裂后箱梁结构的承载力只为原设计状态的80%。

The mechanical property of the PC box girder bridge with transverse cracks occurring in the mid-span area is complex, and the evaluation of the bearing capacity is difficult. Based on the statistic parameter of cracks, through converting the real transverse cracks into the statistic average ones, these statistic cracks are simulated with the numerical analysis method. After comparing the analysis results of the uncracked bridge with the ones of the cracked bridge, the variation of the bearing capacity can be estimated. the PC box girder structure with transverse cracks The results show that the bearing capacity of is 80% of the one of original design. 2 tabs, 8 figs, 10 refs.