在役空心板桥挠度横向分布系数统计分析

Statistic Analysis on Deflection Transverse Distribution Coefficients of In-service Hollow Slab Bridges

为更准确地掌握在役空心板桥的实际受力状态,统计了110座桥梁、175个荷载试验工况的实测数据,通过回归分析获得了相对挠度横向分布系数与相对桥宽之间的函数关系,并与有限元分析进行了对比。研究结果表明,在役空心板桥的横向分布系数变化规律主要受到宽跨比的影响;在梁格法有限元模型中,用同一种横向联系方式分析不同空心板桥时精度会有所差别,故其横向刚度应根据宽跨比进行修正。

In order to understand the actual forced conditions of in-service hollow slab bridges more precisely,measured data containing 110 bridges and 175 load cases were counted in this paper. The functional relationship between the relative deflection transverse distribution coefficient and the relative bridge width was established through regression analysis. For comparison,finite element(FE) analysis was also carried out. The results show that,the width-span ratio of the in-service hollow slab bridge is the main factor which influences the transverse distribution coefficients. In grid frame FE models,the analysis accuracy of different hollow slab bridges using identical transverse connection turns out different,hence the transverse stiffness should be updated according to the width-span ratio.