大角度V撑蝶形拱式连续梁桥施工风险分析

基于HGMFN综合评价方法, 分析了桥梁工程施工过程风险问题, 提出了定量研究V撑施工风险因素的实用方法。根据层次分析法并结合灰色理论, 确定了施工过程最大的风险因素, 进行了施工方案比选。运用ANSYS有限元软件, 对V撑应力状态进行了数值模拟。根据蒙特卡洛原理, 采用径向基函数人工神经网络进行风险概率分析。研究结果表明: 当结构应力状态仿真次数超过200万次时, V撑顶部与主梁相接处失效风险比斜腿根部大8.5%, 为施工过程中主要的结构失效风险发生部位; HGMFN综合评价法可以实现对风险因素的定量分析, 具有较高的风险分析计算精度和效率。

Construction risk analysis of butterfly arch continuous girder bridge with large angle V-shaped pier

The risk analysis problem of bridge construction was studied based on HGMFN comprehensive evaluation method, and a practical approach was proposed for V-shaped pier in construction process.The highest risk factor in V-shaped pier construction was confirmed by using AHP and grey theory, and construction plan comparison was carried out.Numerical simulation of stress state for V-shaped pier was done by using ANSYS software.Risk factor analysis was carried out on the basis of Monte Carlo theory and radial basis function artificial neural network technology.Analysis result indicates that when the simulation of structural stress state is more than two million times, the connection between V-shaped pier top and main beam has 8.5% higher failure risk than root of slant leg, which is the main structure failure risk location.HGMFN comprehensive evaluation method can analyze risk factors quantitatively, and has higher risk analysis accuracy and efficiency.