Abstract：Research purposes:When mufti-cell box girder is bending, there are many models of shear lag corresponding to its calculation model of longitudinal stress based on elementary beam theory. On the basis of analyzing the shear lag basic models and mechanical mechanism，shear lag effect of a railway simple supported twin-cell box girder is calculated which applied by concentrated force on mid span and uniform load on full span. With the changing of Height-span ratio，shear lag effect of different load models are discussed.
Research conclusions;(1)For twin-cell box girders，there are more shear lag effect models corresponding to its longitudinal symmetric load model，meanwhile there is much difference between different models.(2)In all shear lag effect models，the most prominent model is concentrated force only applied on mid web. Also，this model is affected by the height-span ratio most obviously.(3)Considering the multiple patterns of shear lag effect，in designing of mufti- cell box girder, the influence of different load models of shear lag effect should be considered fully. ( 4 ) The simulation method and results of this paper have some reference value for design and mechanical analysis of mufti-cell box Girders.
Sun Lu, Wang Wenlei, Wu Guoqi, etc. Analyses of the Causes for Crack on the End Side of Box Girder for Railway Passenger Dedicated Line and Its Construction Control[J].Journal of Railway Engineering Society , 2007(10):46-51.
[3]郑健.中国高速铁路桥梁[M].北京:高等教育出版社， 2008.
Zheng Jian. Chinese High-speed Railway Bridges [M].Beijing:Higher Education Press, 2008.
Ma Huadong. Research on Effective Width of Continuous Single-Box Three-Cell Broad Box Girder [J].Journal of Shijiazhuang Tiedao University (Natural Science )，2012(1)：30-33.
[6]宁立，郭文华.梯形多室宽箱梁上部结构设计研究[J]. 公路，2012(1)：74-77.
Ning Li, Guo Wenhua. Design and Study of Trapezoid Multicell Box upper Structure [ J ].Highway , 2012 (1): 74-77.
[7]Razaqpur A. G.Li H. G. Thin-walled Multicell Box-Girder Finite Element [ J ].Journal of Structural Engineering , 1991(10 ) :2953-2971.
Yang yunbiao, Huang Jianyuan. Analysis of Shear Lag Effect of Multi-cell Box Girder With Generalized Finite Stripe Method[J].Bridges Construction, 1995 (4):40-46.
[9] Sung C. L.，Chai H. Y.，Dong Y. Y. Analysis of Shear Lag Anomaly in Box Girders[J].Journal of Structural Engineering , 2002 (11):1379-1386.
2014, Vol. 31 
版权所有 © 2014 《铁道工程学报》编辑部