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Mechanical Analysis on the Construction Process of Steel Truss by Monte-carlo SFEM

Author: XuZuo
Tutor: LiuYongJian
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: steel truss bridge Construction sequence variation benchmarking FEM Stochastic FEM Monte Carlo SFEM Stress History Stress frequency
CLC: U441
Type: Master's thesis
Year: 2010
Downloads: 84
Quote: 0
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Abstract


The steel truss bridge possess advantages of steel material and truss construction, therefore, it can be widely used in long-span, over loading and double-deck construction. However, because of various members, the construction of the steel truss bridge is large and difficult, easy to bring the manufacture and assemble error, whose impaction was not studied fully.The paper relied on Dongjiang Bridge, using Monte-Carlo finite element analysis, analyze the effect of construction error on the mechanical properties of truss bridge. The paper contents as follow:(1) The mechanical properties in different construction phase is analyzed, the outcome shows that: rigid suspension cable stiffening can effectively participated in carrying load, and reduced main truss internal force. The adjustment of the horizontal and vertical internal force can be propitious to the construction carrying equilibrium load.(2) The influence caused by the variation of construction sequence is analyzed, and the function of removing temporary pier after the main truss and stiffening chords construction is studied. The best opportunity to adjust vertical and horizontal internal force and twist bolts connecting crossbeams and stringers is forwarded.(3) With construction process finite element analysis, the effect of stochastic error parameters on construction internal force and construction linear is analyzed, which shows that:the error parameter assemble effect gradually formed after structure, bridging phase and the stochastic error parameters have great effect on structure internal force and main truss displacement.(4) Using finite element analysis, the stress history and stress frequency about the longest suspender and the vertical stick of gantry were analyzed, and the worst construction phase to them was found.The members’ internal force and displacement impacted by stochastic errors was studied in probability. By the study the members with higher levels of internal force or sensitively responsed to errors were found. And also the paper made probability analysis and analysis of stress history to these important members.The above analysis can provide guidance for the optimization of steel truss bridge design and construction. It will have important theoretical and engineering significance.

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