再议梁板桥横向分布及其在加固中的问题

通过理论分析并建立有限元实体单元模型大量计算,对传统力学假设和简化计算与实际结构间存在的差异,以及桥梁结构由于破损或加固造成的横向分布变化进行研究,并以实际桥梁工程为背景,用计算实例进行验证。结果表明,各实际桥梁结构与简化计算结果间存在差异,传统的桥梁横向分布计算方法存在偏不安全的地方;提出了一些实际桥梁结构的横向分布系数的修正系数,用于修正横向连接的缺损或加固导致横向分布系数的变化。提出的修正系数具有较好的工程实用性,得到的桥梁受力状态将更加符合板梁的实际受力状况,可供工程设计参考。

Reconsidering of Transverse Distribution of Beam-slab Bridge and Problems in Reinforcement

Based on theoretic analysis and calculation by establishing solid finite element model,the variance between mechanical hypothesis/simplification and the real structure and the changes of transverse distribution of bridge caused by structural damage or reinforcement were discussed.A practical calculation example was presented to justify the research.The result show that(1)there are some differences between the computational solution and real construction;(2)the transverse distribution calculated by traditional methods is partial to unsafe.Correction factors of transverse distribution coefficient for some real constructions were put forward for correcting the change of transverse distribution coefficient caused by damage or reinforcement of transverse connection.The correction factors can make the calculated mechanical state better accord with the actual bridge and can be referenced by similar engineering.The evaluation result demonstrates the validity of these correction factors.