芜湖长江大桥箱形压杆稳定性试验研究  

Test of Stability of Compressive Box Member Welded with Thick Plates of Wuhu Yangtze River Bridge

作　　者：彭旭民[1] 蔡登山[1] 

机构地区：[1]中铁大桥局集团桥梁科学研究院,湖北武汉430034

出　　处：《中国铁道科学》2001年第5期98-102,共5页China Railway Science

基　　金：铁道部科技发展计划项目 (96G3 5 )

摘　　要：使用切割法对芜湖长江大桥板厚 44mm及 40mm的箱形压杆焊接残余应力进行了实测 ,给出了残余应力沿板厚和板宽方向分布的规律及加劲肋对残余应力分布的影响。在实测基础上 ,根据统计原理拟合了用于理论计算的厚板焊制箱形压杆的残余应力分布图式。采用数值积分法 ,编制了压杆极限承载力的有限元计算程序 ,分别考虑初偏心、残余应力等初始缺陷及加劲肋等因素的影响 ,对厚板焊制箱形压杆的极限承载力进行了分析研究。计算结果表明 :随着长细比λ的增加 ,杆件逐渐由压屈特性表现为压溃特性 ;残余应力及初偏心对工程常用构件的极限承载力有较大影响 ,残余应力可使稳定系数 φ值降低近 2 0 % ;芜湖桥箱形压杆的加劲肋对 φ值影响不明显 ,其主要作用在于增强构件的局部稳定。The sectioning method is used for the residual stress measurement. The regularities of residual stress distribution along plate thickness and width of compressive box member welded with 44 mm and 40 mm thick plates of Wuhu Yangtze River bridge and the influences of stiffeners thereof upon the stress distribution are described in the paper. A diagram distribution of the compressive box member for theoretic calculation is provided and a finite element program in regard to initial eccentricity, initial bending and the residual stress for the ultimate carrying capacity of the member is complied. The ultimate carrying capacity of the member is analyzed and studied. Based on the calculation, the following conclusions are drawn: The behavior of axis loaded column shows from lateral deflection to conquassation gradually as the raising of λ ;The residual stress and initial out of straightness mainly affect to the column commonly used in engineering. The stiffening rib of box member used in Wuhu Yangtze River bridge is to ensure the local stability, and its effect to φ value is not obvious .

关 键 词：芜湖桥 厚板焊制 箱形压杆 残余应力 稳定系数 极限承载力 切割法 试验研究 公路铁路两用桥 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U446.1[交通运输工程—道路与铁道工程]