基于空间网格分析的多箱室波形钢腹板组合梁腹板剪力分配  

Shear distribution of multi-cell corrugated steel web composite beams based on space grid analysis

作　　者：尼颖升[1] 孙启鑫 马晔[1] 徐栋[2] 刘超[2] NI Ying-sheng;SUN Qi-xin;MA Ye;XU Dong;LIU Chao(Research Institute of Highway,Ministry of Transport,Beijing 100088,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]同济大学土木工程学院,上海200092

出　　处：《吉林大学学报（工学版）》2018年第6期1735-1746,共12页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51278521)

摘　　要：针对多箱室波形钢腹板组合梁桥设计中空间杆系模型缺乏空间效应精细化分析,平面梁格法在等效原理上的近似性不能准确反映箱形组合梁的剪应力分布和顶底板局部受力,以及实体模型很难与总体计算相结合的缺点,提出采用空间网格分析方法进行多箱室波形钢腹板组合梁腹板组合梁桥剪力分配。实例分析结果表明:空间网格模型可以将各道腹板剪力横向分配全部算清楚,且得出了斜拉桥边中跨的关键截面横梁处各道腹板剪力分配规律,为此类工程设计提供了一定的参考价值。The composite girder bridge with multi-cell corrugated steel web has been widely used in recent years,but there are some deficiencies in the corresponding specification and fine calculation methods.At present,the design mostly adopts the computational analytical method combining the spatial bar system model,plane beam grillage model and solid model.However,the spatial bar system model is short of the refinement analysis on the space effect,such as the shear lag effect, effective distribution width problem,and eccentric load factor problem etc.Due to the similarity of the plane beam grillage method in the equivalence principle,it can not accurately reflect the shearing stress distribution and local stress of the top and bottom plates of the box type composite beam.The solid model is very difficult to combine with the overall calculation.Moreover,the spatial grid model can achieve the refinement analysis,with the integrity of the analysis and the comprehensiveness of the stress checking calculation,and can make up the deficiency of the analytical method currently. Through the example verification of the solid model and spatial grid model,it can be seen that thecalculation results for the stress and the displacement of two models are almost consistent,indicating the applicability and precision of the grid model.The real bridge analysis shows that the space grid model of multiple chamber box girder with corrugated steel webs can be calculated the web shear transverse distribution clearly,and the each web shear distribution rules of cable-stayed bridge at the key sections of side and mid span,so it can provide some suggestions for this kind of engineering design.

关 键 词：工程力学 波形钢腹板 组合梁斜拉桥 多箱室 空间网格模型 精细化分析 

分 类 号：TU318[建筑科学—结构工程]