考虑横坡的多箱室箱梁梁格法应用研究  

Application Study on Grillage Method for Multiple-Cells Box Girder with Transverse Slope

作　　者：黄祖慰 雷俊卿[1] 唐继舜[2] 

机构地区：[1]京交通大学土木工程学院,北京100044 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2018年第1期56-63,共8页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51578047,51178042);中国铁路总公司科技研究股份有限公司科技特大研发项目(014-ZJKJ-03)

摘　　要：为了研究多箱室箱梁基于梁格法计算的影响因素,考虑了横坡构造对多箱室箱梁的受力特性进行了分析.对梁格法理论的应用进行拓展,推导了适用于具有横坡构造的多箱室箱梁梁格截面特性值计算公式,并讨论考虑横坡的合理性;采用数值模拟的方法进行参数分析,通过改变加载位置、箱梁宽跨比、横坡大小等参数,对研究对象的受力特性进行了对比分析.研究结果表明:考虑横坡时,梁格截面刚度特征值更加接近实际,减小了12.12%的误差;具有横坡构造的多箱室箱梁的梁格模型与实体有限元模型计算结果吻合程度好,但仍无法反映箱梁在承受荷载时产生的畸变;考虑横坡构造的梁格法计算精度的提高主要体现在截面横向位移计算结果上;当箱梁宽跨比大于0.8时,采用梁格法计算时需要考虑横坡的影响;随着横坡大小从0增加到2%时,截面的竖向位移最大差值增加了758%,呈线性递增.Mechanical proper t ies of mul t iple-cel ls box girder with the transve rse slope were analyzed in order to study the factors when using the grillage method. Based on the grillage method,formulas for multiple-cells box girder with tte transverse slope were derived while rationality of considering the transverse slope was discussed. Parameter analysis was done by adopting numerical simulation. Contrastive analysis on mechanical characteristic were done by changing the parameters such as loading positions, width-span rat ios of box gi rder, cross slope an gles . T h e re su l ts show th a t th e er ro r in computing characteristic value of grillage section rigidity is decreased up to 12. 12% when the transverse slope is considered. The calculated results of grillage model fit the results of solid model, however, dis tortion cannot be ref lect in the gr illage model of mul t iple-cel ls box girder . The improvement of calculation precision is mainly appear on lateral displacement. Transverse slope wouldbe considered in the grillage model if width-span ratio is greater than 0. 8. Vertical displacement of cross section is increased linearly up to 758% when the transverse slope is change from 0 to 2% .

关 键 词：梁格法 多箱室箱梁 横坡效应 数值模拟 参数分析 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]