考虑残余应力影响的焊接工字型弧门支臂稳定数值分析的等效模型研究  

Equivalent model for numerical stability analysis of welded I-shaped radial gate arm considering the influence of residual stress

作　　者：张学东 韩一峰 王正中[1] 李会军[1] 徐超[1] 张欢龙 刘丰[1] ZHANG Xuedong;HAN Yifeng;WANG Zhengzhong;LI Huijun;XU Chao;ZHANG Huanlong;LIU Feng(Water Engineering Safety Research Center for Arid&Cold Regions,Northwest A&F University,Yangling 712100,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou 310014,China)

机构地区：[1]西北农林科技大学旱区寒区水工程安全研究中心,陕西杨凌712100 [2]中国电建集团华东勘测设计院有限公司,浙江杭州310014

出　　处：《水资源与水工程学报》2021年第4期172-179,共8页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51179164);国家自然科学基金青年基金项目(51505388);国家科技支撑计划项目(2012BAD10B02)。

摘　　要：弧形钢闸门的失事破坏主要是由于支臂发生屈曲失稳导致的,支臂的稳定性是保证整个闸门安全稳定运行的前提。针对当前支臂稳定计算精度和求解效率不足的问题,为探究可用于支臂实际稳定承载力计算的等效简化模型,确定出考虑残余应力对稳定性影响的综合初始缺陷幅值,以两端铰接的焊接工字型弧门支臂为研究对象,采用非线性屈曲分析方法探究残余应力分布模式、残余压应力峰值以及几何初始缺陷幅值等因素对其稳定承载力的交互影响,并与现行《钢结构设计标准》(GB 50017—2017)计算结果进行对比验证。结果表明:对于大柔度支臂,综合初始缺陷幅值取为L/600;而对于中小柔度支臂,综合初始缺陷幅值取为L/400。按照综合初始缺陷幅值所建立的支臂等效模型能够充分考虑截面残余应力及几何初始缺陷对稳定承载力的综合影响,数值计算结果与《标准》计算结果吻合较好,可以替代原有支臂复杂的非线性稳定模型。研究成果可为工程技术应用提供参考。The failure of the radial steel gate is mainly caused by the buckling instability of its supporting arm,and the stability of the arm is the premise of safe and stable operation of the whole gate.Aiming at the current problem of insufficient calculation accuracy and efficiency of the arm stability,it is of great significance to find an equivalent simplified model which can be used to calculate the actual stability bearing capacity of the arm,and determine the comprehensive initial imperfection amplitude considering the influence of residual stress on the stability.Taking the welded I-shaped arm with two hinged ends as the research object,we investigated the interactions between the stability bearing capacity and the factors of residual stress distribution mode,residual compressive stress peak value and geometric initial imperfection amplitude using a nonlinear buckling analysis method.Then the calculation results were compared with the specified value in the Standard for Design of Steel Structures(GB 50017—2017).The results show that for large flexible arm,the comprehensive initial imperfection amplitude is L/600,whereas for medium and small flexible arms,it is L/400.The proposed equivalent model fully considers the influence of cross-section residual stress and geometric initial imperfection on the stability bearing capacity of the arm.Its calculation results are in good agreement with the specified value in the standard,so it can replace the original complex nonlinear stability model for gate arms.The research results can provide some reference for the application of the model in actual projects.

关 键 词：弧形钢闸门 工字型弧门支臂 稳定分析 残余应力 等效模型 

分 类 号：TV314[水利工程—水工结构工程]