多梁式小箱梁桥沿纵向有效宽度的动力识别方法  

Dynamic Method for Identifying Multi-box Girder Bridges' Lateral Effective Width

作　　者：王晖[1] 项贻强 

机构地区：[1]浙江大学交通工程研究所,浙江杭州310027

出　　处：《公路交通科技》2006年第8期89-92,共4页Journal of Highway and Transportation Research and Development

摘　　要：与传统的有效宽度计算方法不同,在整桥的动力分析结果和弹性支承连续梁法荷载横向分布理论的基础上,通过假定弹性支承连续梁法动力分析模型的面内1阶转动频率与整桥1阶扭转频率相等,提出了一种多梁式小箱梁桥沿纵向有效宽度的动力识别方法。然后利用该方法识别得到的有效宽度计算各主梁的横向分布影响线及横向弯矩,并与空间有限元模型的计算结果进行了对比,结果表明该法具有很高的精度,为此类问题的研究提供了一种新的思路。Different from the traditional method for calculating effective width, a new dynamic method for identifying multi-box girder bridges＂ lateral effective width is presented in terms of the dynamic behaviour of wbole bridge and elastically supported continuous beam method for load lateral distribution and assuming that 1st rotation frequency within plane obtained by the dynamic model of elastically supported continuous beam method is equal to 1st torsion frequency of whole bridge gained by the spatial FEM. The load lateral distribution influencing line of each girder and transverse bonding moment are analyzed by the identified effective width. The results are compared with those by spatial finite element model. The numerical example shows that the presented method has high precision. It offers a new way for solving this type of problem.

关 键 词：多梁式小箱梁桥 有效宽度 动力识别 弹性支承连续梁法 横向分布 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]