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Research on Shear Lag Effect of through Spine Girder for Urban Rail Transit

Author: SuZhiHui
Tutor: XuYanQiu
School: Beijing Jiaotong University
Course: Architecture and Civil Engineering
Keywords: Urban Rail Transit Viaduct Under -supporting the spine beam Shear Lag Effect Shear lag coefficient Effective width
CLC: U448.13
Type: Master's thesis
Year: 2011
Downloads: 36
Quote: 0
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Abstract


Urban Mass Transit Viaduct the applicable beam type T-beams, box girders, Channel Beam, under-supporting spine beam. Most of the current domestic and international rail traffic viaduct T beams, box girders, while fewer applications for Channel Beam and under-supporting the spine beam, especially under-supporting the spine beam no application instance in the country, the international community only Canada Gal Lee LRT selection such beam type. Under-supporting the spine beam bridge is a new kind of urban rail transit viaduct, its main advantage is the low height of bridge construction, independent of the span of the impact of changes. At home and abroad for the under-supporting the spine beam rarely only been mentioned in the literature overview and outlook. Under-supporting the spine beam is small box girder increase the cantilever structure, the cantilever flange plate special wing will participate as part of the beam, main beam longitudinal bending, transverse shear lag effect is very significant; simultaneously cantilever lateral bending board board load lateral pass to the backbone, that there are longitudinal shear lag effect. This article refers to the study of shear lag effect in box girder design theory to study the beam shear lag effect of under-supporting the spine, general-purpose finite element software ANSYS to establish a model for analysis of three-dimensional space under the deck spine beam. The main contents include: (1) by the contrast SOLID185 solid element model and SHELL93 shell element model analysis to determine the reasonable choice of finite element modeling. (2) research under the Order of the spine beam longitudinal horizontal shear lag effect in curved case, analysis of different types of loads, load a different role in the location of the transverse shear lag effect. Shear lag coefficient obtained on the basis of further analysis of the under-supporting the spine beam transverse effective distribution width, the initial transverse effective distribution width fitting formula. (3) research under the Order of the spine beam lateral longitudinal shear lag effect in curved cases, the same load type, load position of the longitudinal shear lag effect. The the longitudinal shear lag coefficient obtained based on further analysis of under-supporting the spine cantilever plate longitudinal effective distribution width given the the vertical effective distribution width fitting formula. Through horizontal, vertical shear lag effect analysis, effective distribution width recommended formula, to provide a reference for the design of urban rail traffic under the viaduct supporting spine beam.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridges: by end-use > Railway bridge
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