基于监测数据的装配式箱梁桥湿接缝连接建模与分析

Modeling and Analysis on Wet Joint Connection of Assembled Box Girder Bridge Based on Monitoring Data

摘要:

针对装配式小箱梁桥湿接缝开裂问题，对湿接缝横向连接作用采用共节点弹簧建模方法，并采用湿接缝局部分析和响应面方法求解共节点弹簧刚度，建立小箱梁桥共节点弹簧有限元模型，最终通过对比共节点弹簧模型、梁格模型、壳单元模型的小箱梁桥动力特性，验证共节点弹簧刚度值的可用性和适用性。结果表明：3个模型的桥梁动力特性结果一致，采用共节点弹簧模型可准确表征湿接缝横向连接作用，可用于装配式小箱梁桥的损伤分析。

关键词:湿接缝;共节点;弹簧;模型修正;响应面法

Abstract:

Aiming at the problem of wet joint cracking of assembled small box girder bridge， the common node spring modeling method is used for the transverse connection of wet joint. And the local analysis and response surface method of the wet joint are used to solve the common joint spring stiffness. The finite element model of the common node spring of small box girder bridge is established. Finally， the availability and applicability of common node spring stiffness values are verified by comparing the dynamic characteristics of common node spring model， beam lattice model and shell element model of small box girder bridge. The results show that the dynamic characteristics of the three models are consistent， and the common node spring model can accurately characterize the transverse connection of wet joints， which can be used for the damage analysis of assembled small box girder bridges.

Key words:Wet joint; Common node; Spring; FE Model updating; Response surface method