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Temporary Support of a Bay Bridge Stability Analysis

Author: WangJing
Tutor: HuChangMing
School: Xi'an University of Architecture and Technology
Course: Structural Engineering
Keywords: bridge temporary support comprehensive defects initial bending stability coefficient stable bearing capacity
CLC: U441
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 0
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Abstract


The paper systematically summarizes the background, classification, calculated mode and the stability theory analyses of domestic and overseas research,developing tendency about construction temporary support structure, analyzes the classification and research status from several aspects in detail, and then points out some problems to be solved and the corresponding solution. The paper takes fastener-style tubular steel falsework and large diameter welded steel pipe temporary support as the research object, and researches their stability coefficient. The main research results in this paper can be summarized as the following respects:Firstly, the research group carried out a series of 6m high full-scale experiment research on the fastener-style tubular steel falsework system for construction, got the ultimate bearing capacity under specific conditions. The paper analyzes steel stability coefficients according to the relevant norms and testing data, got the stability coefficient values about corresponding initial defects.Secondly, the paper takes the large diameter welded steel pipe temporary support of the main tower in Qingdao bay bridge girder as the research object, through comparing various of hoisting methods, finally determined to use the large segment hoisting method, which also is building-up temporary steel pipe support as temporary pier. According to the construction method, analyzed the mechanical characteristics of the structure, and studied the loads and adverse loads combination of the temporary support. The paper checked the stability characteristics of the temporary support under the dead loads, wind loads and other load combination in the construction phase. The results show that the support has sufficient safety margin under a variety of adverse load combinations. Finally, according to the actual design parameters of the temporary support, by using the finite element software, established three-dimensional finite element model. By eigenvalue buckling analysis, researched the primary buckling mode of long-span support. Do the nonlinear stability analysis, and used the Arc-Length method to analysis the whole process of structure, got the stability capacity and the whole process of the instability. Considering the sectional characteristic and actual geometric imperfection of steel tube, based on the bearing capacity got by finite element numerical computation, studied initial bendingν0and stability coefficient? , and gives the suggested value, provides the reference for the design and calculate of large diameter welded steel pipe temporary support in Bridges.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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