大跨径桥梁微观裂缝扩展路径精准预测仿真  

Accurate Prediction and Simulation of Microscopic Fracture Expansion Path in Large-Span Bridge

作　　者：李晓涛 王露露 LI Xiao-tao;WANG Lu-lu(Henan GEM Engineering Management Consulting Co.,LTD.,Luoyang Henan 471000,China)

机构地区：[1]河南璟信工程管理咨询有限公司,河南洛阳471000

出　　处：《计算机仿真》2025年第3期203-207,共5页Computer Simulation

基　　金：洛阳市科技计划项目(JCZ20189)。

摘　　要：大跨径桥梁受到多种不同方向和大小的载荷作用,使得裂纹形态和尖端形状受微观结构、应力分布等复杂因素的影响,难以精确地预测裂缝扩展路径。为此,研究大跨径桥梁微观裂缝扩展路径预测算法。分析裂缝附近的位移场,获取裂缝中的流体压力与岩体变形情况,实现对裂缝中的流体流动特性分析。根据碳纤维薄板和混凝土的界面微观裂缝,求解扩展构件的应变能释放率,得到裂缝的应力强度因子。基于历史数据集合,将应力强度因子代入到灰色预测法中,完成大跨径桥梁微观裂缝扩展路径预测。实验证明,所提算法能够准确预测大跨径桥梁微观裂缝扩展路径,F1值与平均交互比均高达90,可以及时发现潜在的安全隐患。Long-span bridges are subjected to loads in different directions and sizes,which affects the crack shape and tip shape by complex factors such as microstructure and stress distribution,and it is difficult to accurately predict the crack propagation path.Therefore,the prediction algorithm of the micro-crack propagation path of longspan bridges is studied.By analyzing the displacement field near the cracks,the fluid pressure within the cracks and the deformation of the rock mass are obtained,thereby realizing the analysis of fluid flow characteristics in the fracture.According to the interface micro-cracks between carbon fiber sheet and concrete,the strain energy release rate of extended members is solved and the stress intensity factor of cracks is obtained.Based on the historical data set,the stress intensity factor is substituted into the grey prediction method to predict the micro-crack propagation path of long-span bridges.Experiments show that the proposed algorithm can accurately predict the micro-crack propagation path of long-span bridges,and the F1 value and the average interaction ratio are as high as 90,so that potential safety hazards can be found in time.

关 键 词：大跨径桥梁 微观裂缝扩展路径 应力矩阵 扩展路径预测 弹性系数 

分 类 号：U446[建筑科学—桥梁与隧道工程] TP391.9[交通运输工程—道路与铁道工程]