Subsection Construction Of Reinforced Concrete Arch Bridge Outsourced Concrete Technical Study

The rigid frame arch bridge can build the weight of the arch ring to every construction stage through the construction system built by itself,which provides possibility for the development of the concrete arch bridge to the large span.How to make reasonable construction plan,control the stability of the whole bridge structure during the construction of outsourcing concrete and how to improve the span ability of the stiffened framed arch bridge has become the focus of the research on the CFST rigid frame arch bridge.This paper uses the finite element software,the establishment of a CFST arch bridge finite element model,segmentation method to eight segment of the concrete pouring simulation of long-span reinforced concrete arch bridge of concrete block construction outsourcing were analyzed,and six segment pouring method,verify the validity of the mathematical model.The longitudinal sectional pouring sequence and the sectional ring casting sequence are optimized and analyzed.The conclusions drawn from the problems of structural deflection,structural stress and structural stability are important reference for the construction process of long-span concrete-filled steel tubular stiffened arch bridge.Because of the complexity of the special structure of the rigid frame arch bridge itself,the redistribution of the structural stress after the bridge has a great influence on the overall structural performance of the arch bridge.In this paper,the following conclusions are drawn through the simulation analysis of the construction process of the outsourced concrete of an extra large arch bridge.(1)In the process of pouring arch bridge reinforced concrete in concrete influence outsourcing,solidification of the arch bridge line need to be taken into account in the simulation stage,the concrete pouring of the actual project,by changing the modulus of concrete to reflect the solidification process of concrete;(2)The simulation results show that when the deflection of the vault section is controlled by finite element simulation,the deflection of other parts is better than the six stage casting method when the eight stage casting method is applied.(3)In this calculation method,the effective position can be calculated by mathematical method,through the concrete construction process simulation of stiff skeleton arch bridge,using finite element analysis software to calculate the deflection of the line,the bridge deflection trend in the outsourcing in the process of concrete construction can be predicted.(4)We obtain segmented skeleton reinforced concrete pouring method by using the finite element software simulation mode,and studies the actual use of the method of pouring arch bridge were optimized.The results show that linear control using eight segment pouring method with six concrete pouring section is more conducive to the stiff skeleton bridge.