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Research on Sliping and Effective Width of Bridge Panel in Composite Cable-stayed Bridge

Author: LiuYang
Tutor: LiuZuoYu
School: Wuhan University of Technology
Course: Bridge and Tunnel Engineering
Keywords: composite cable-stayed bridge shear lag effective-width slip shear connection degree
CLC: U443.31
Type: Master's thesis
Year: 2010
Downloads: 108
Quote: 1
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Abstract

The steel beam and concrete panel of steel-concrete beams are joined to the whole and work together through the shear connector. Shear connectors bear the vertical shear between steel beams and concrete slab to prevent the occurrence of slip. But in practice,it is difficult to guarantee non-slip, whether it is part of the shear connection or complete shear connection. Slip impact the mechanical properties of composite structure and the stress distribution of concrete slab, giving rise to worse of loads and the structure of capacity reduction. Meanwhile, the stayed-cable of composite dirder cable-stayed bridge are anchored in the both sides of the main steel beam. The horizontal component of cable force focus on the main beam by the form of discontinuity to cause large local stress near the anchorage and asymmetric distribution of stress in the bridge panel. There is more serious shear lag in the bridge deck. Based on the construction of wuhan Yangtze river bridge as the research background matters, establish the typical section model, research on slippage between steel girder and concrete panel, shear lag effect in bridge panel. Reveals slippage between steel girder and concrete panel, shear lag effect in bridge of the composite girder cable-stayed. The basic work carried out will be summarized as follows:①The establishment of the typical section model，Erqi Road of Wuhan Yangtze River Bridge were calculated under the dead load value of each segment of the slip distribution. The value of slip at main span of 3/8 is maximum, between 2 millimeter to 4 millimeter. The value of ship at main span is minimum, between 0.5 millimeter to 0.58 millimeter. Meanwhile, the analysis of the value about slip in different strength, thickness and stud arrangement of concrete panel, work out that the strength and thickness of concrete have a little influence on slip, the rows of studs and vertical spacing have obvious influence on it, though analysis and comparison of calculated, the rows of studs at steel main beam set three rows,the longitudinal distance set 20 centimeter to 30 centimeter.②Considering the slip, establish two-node spring element, through finite element analysis of space, calculate the stress distribution in the bridge deck under dead load and normal operation load, the value of effective width coefficient in the bridge deck between 0.748 to 0.916.At the same time, research the degree of shear connection on the effective width of the bridge panel. Determine the best degree of shear connection between 0.8 to 1.0.③Apply a single cable tension in the segment model, change the boundary conditions, calculate the stress distribution in the bridge deck, linear fit equal stress of concrete panel, obtain the transmission angle of the cable forces in the bridge panel, which is 28.6 degree.

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