Qu Liang Footbridge(Hanqiao)Construction Control And Bearing Arrangement Solution Discussion

The steel truss curved beam bridge has a novel structure and beautiful shape,and is widely used in modern bridge construction.However,the mechanical performance and construction control are more complex than the traditional straight beam bridges.In the construction process,the segment shape,installation orientation,system conversion control,and the "bending and torsion coupling" effect in the completed state and the "temperature climb" The "shift" phenomenon is the key and difficult point in the design and construction control of such bridges.In order to study systematically and comprehensively the mechanical characteristics and construction control technology of steel truss curved beam bridges,this paper uses a three-span steel truss continuous curved beam bridge--Liuyanghe Renhang Landscape Bridge(Hanqiao)of Changsha City as its engineering background.The hoisting construction control technology and the layout plan of the bridge bearing were discussed.The main contents are as follows:(1)Using the finite element software Midas Civil for simulation analysis,the entire process of hoisting construction was simulated,and construction and monitoring instructions were given based on the simulation results.At the same time,the phenomenon of "temperature creep" in the curved beam bridge was analyzed.The results showed that:uniform temperature rise to the main The horizontal displacement of the truss has a significant influence;the temperature gradient has a significant influence on the reaction and internal forces of the structural bearings,and the main beam has the tendency of everting and twisting.(2)The system describes the positioning situation of the lifting section,and the establishment of the on-site measurement and control system principles and processes,and verified the feasibility of construction control through on-site measurement and test results.Based on Hanqiao's structural characteristics and bridge construction conditions,the system conversion scheme was studied.The results showed that:the non-synchronous cutting of temporary bridges across the middle will lead to excessive bending moments and torsional stresses in the structure,which is not conducive to safe construction.As far as possible to ensure that cutting the same height,the same direction;measured stress and line shape and theoretical simulation results are close,indicating that the simulation calculations and monitoring results are reliable.(3)According to lifting data and theoretical simulation results,finite element software was used to simulate the mechanical behavior of the main truss under different bearing arrangement schemes,and the influence rules of different bearing arrangements on the performance of Han Bridge were discussed.Block design provides corresponding reference and has a certain engineering significance.