腹板倾角对波纹腹板钢箱梁地震响应的影响

Effect of Web Inclination Angle on Dynamic Response of Corrugated Web Steel Box Girder

为研究腹板倾角对波纹腹板钢箱梁地震响应的影响,以某波纹腹板钢箱简支梁为工程背景,通过控制主梁混凝土顶板宽度、钢底板宽度及钢箱内截面面积设定3种工况,利用ABAQUS有限元软件建立各工况下不同波纹钢腹板倾斜角度的三维有限元模型,分析了3种工况下腹板倾斜角度对主梁动力特性的影响规律,并选用E2水平的反应谱对主梁结构进行反应谱分析.研究结果表明:腹板倾角会降低波纹腹板钢箱梁的竖向抗弯及扭转刚度,倾角越大,主梁基频越小,底板宽度不变倾角30°时结构的横向抗弯刚度最大;主梁在地震作用下,最大应力出现在固定支座处,最大位移在主梁跨中截面,与腹板倾角无关;随着腹板角度的增加,主梁地震响应越大,对支座的性能要求也随之增加.

In order to study the influence of Web inclination on the seismic response of corrugated steel box girder,taking a corrugated steel box girder as the engineering background,three-dimensional finite element models of different corrugated steel web inclination angles under different working conditions are established by controlling the width of concrete top plate,steel bottom plate and cross-sectional area of steel box,The influence law of web tilt Angle on dynamic characteristics of main beam under three working conditions is analyzed.The E2 level response spectrum is selected to analyze the response spectrum of the main beam structure.The results show that the inclination of the web will reduce the vertical bending and torsional stiffness of the corrugated web steel box girder.The larger the inclination is,the smaller the fundamental frequency of the main beam is,and the width of the bottom plate remains unchanged.The transverse bending stiffness of the structure is the largest when the inclination is 30°;Under the action of earthquake,the maximum stress of the main beam appears at the fixed support,and the maximum displacement is at the mid span section of the main beam,which is independent of the inclination of the web;With the increase of the web angle,the greater the seismic response of the main beam,and the performance requirements of the support also increase.