体外预应力加固对空心板桥动力特性影响分析

Analysis on Dynamic Characteristics of Hollow Slab Bridge Strengthened by External Prestressing

为研究体外预应力加固对空心板桥动力特性的影响,以某4×16 m简支转连续空心板桥为依托工程,采用通用软件ANSYS分别建立铰接空心板桥与刚接空心板桥仿真模型,基于结构动力学的相关原理,探寻加固前后的桥梁动力特性变化规律。结果表明:经过体外预应力加固,桥梁的低阶竖向频率变化较小,但结构横向频率有较大变化,且结构高阶频率也有一定变化,研究成果可为该类桥梁的动力特性分析提供参考。

In order to study the influence of external prestressing reinforcement on bridge modality, a 4*16 m simple-supported continuous hollow slab bridge was used as a support project.The general software ANSYS was used to establish the simulation model of hinged plate and rigid joint plate respectively.Based on the relevant principles, the modal changes of bridges before and after reinforcement are explored.The results show that: after external prestressing reinforcement, the low-order vertical frequency of the bridge changes little, but the transverse frequency of the structure changes greatly, and the high-order frequency of the structure also changes to a certain extent.It can provide reference for the analysis of dynamic characteristics of such bridges and their applications.