简支槽型钢梁-混凝土曲线组合梁施工阶段扭转效应解析法研究  

Analytical method research on torsion effect of simple curved channel steel girder-concrete composite beams in construction stage

作　　者：张彦玲[1] 刘玉玲[1] 李运生[1] 侯忠明[2] 

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]清华大学土木工程系,北京100084

出　　处：《中南大学学报（自然科学版）》2015年第8期3083-3091,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51108281);河北省自然科学基金资助项目(E2014210038);河北省高等学校科学技术研究项目(ZD2014025);中国博士后科学基金资助项目(2014M560088)~~

摘　　要：采用M/r法将竖向均布荷载作用下梁轴曲率的影响等效为分布扭矩,并基于符拉索夫理论,采用初参数法计算曲线开口钢梁的扭转效应,分别通过离散法和连续法分析横隔板对其产生的影响。研究结果表明:采用离散法和连续法得到的截面扭转角和扭率非常接近,扭矩完全相同,但双力矩和翘曲应力在横隔板位置差别较大;增加横隔板对曲线开口钢梁的扭矩无影响,但使截面扭转角、扭率、双力矩和翘曲正应力均明显减小,翘曲正应力随横隔板数量N的增加非线性下降,随曲线跨度与半径比值的增大线性增长。离散法可明确反映横隔板的影响,但比连续法计算复杂;横隔板数量越多,2种方法的结果越接近。实际工程中的曲线组合梁桥,可采用连续法进行分析。The curvature-induced effect under the vertical uniform load was dealt with equivalent distributed torsion moment by M/r method firstly, and then based on the Vlasov theory, the torsion behavior was calculated by initial parameter method, the diaphragm effect was analyzed by discrete method and continuous method respectively. The results indicate that for the discrete method and the continuous method, the section torsion angle and torsional curvature obtained by the two methods are very close to each other, and the torsion moments are the same entirely, but the double moment and wrap stress have lager differences at the position of diaphragms. Increasing diaphragm number has no influence on the torsion moment, but can make the section torsion angel, torsional curvature, double moment and wrap stress all decrease apparently, in which the warp stress decreases nonlinearly with the increase of diaphragm number, and increases linearly with the increase of the span-radius ratio increase. The discrete method can reflect the diaphragm effect apparently, but is more complicated than the continuous method; with the increase of the diaphragm number, the results of the two methods become much closer. For the curved composite beam bridges, the continuous method is more applicable.

关 键 词：曲线组合梁 施工阶段 约束扭转 横隔板 M/r法 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]