Construction Control And Pushing Effect Analysis Of Rigid Frame Bridge

With the continuous development of society,the demand for social highway traffic construction continues to expand.Due to the large span of continuous rigid frame bridges,good structural stability,and mature construction techniques,they are widely used in basic traffic construction.Continuous rigid frame bridge construction monitoring is an important prerequisite for ensuring the safe completion of the bridge,Therefore,based on a four-span porous long-span continuous rigid frame bridge,midas civil was used to carry out corresponding construction monitoring stress and deformation analysis calculations and closed push theoretical calculations.:(1)Summarizes the development status of the continuous rigid frame bridge at home and abroad and the stress characteristics of the bridge structure itself,points out the important significance of construction monitoring for bridge construction,and further expounds the main contents of bridge construction monitoring,including: girder linearity,section stress,safety and stability control;analyzes and summarizes the construction monitoring adjustment method and construction technology,temperature change,finite element The influence of model and structural parameters on bridge construction monitoring.(2)Through the relevant design data and construction monitoring and control theory and actual monitoring program,the midas civil was used to establish and analyze the finite element model of the bridge structure,and the relevant monitoring stress and strain theoretical values were calculated,which provided the theory for actual construction monitoring.Basis for comparison.The calculation results of stress and deformation are basically negative,the bridge is basically under compression during the construction process,and the change curve is basically consistent with the actual bridge construction.Verify the key section stress and structural deformation in each stage of bridge construction can meet the specification and design requirements.(3)In this paper,the main methods and corresponding error analysis of the adjustment of the on-site construction monitoring deflection are described,the theoretical formwork elevation of the bridge structure is given,the actual layout plan of the bridge monitoring measuring points and the working condition arrangement and requirements are given,through the linear through measurement results of the whole bridge of the left and right breadth of the bridge,it can be found that except Outside individual measuring points,the measured elevation of the whole bridge deck fluctuates around the theoretical value within the range of 30 mm,and the monitoring effect is good.Verify the feasibility and accuracy of the theoretical method of linear construction control of the bridge.(4)The closure jacking analysis of the bridge structure is calculated by finite element method and the calculation method of the theoretical closing thrust and displacement size is summarized and explained;the theoretical thrust size and displacement of the bridge structure are calculated by finite element method;through theoretical and actual results,it is found that the difference between the two is basically the same.Verify the feasibility and accuracy of the theoretical method of linear construction control of the bridge.