The Influence Factors Of Construction Monitoring Target Of Prestressed Continuous Beam Bridge And Seismic Response Analysis

In recent years, with the rapid development of high-speed railway construction, the speed of the train and the comfort of the requirements have been greatly improved.Thus, the quality of long-span bridges, the bridge liner and the construction safety of the bridge must be strictly controlled.However, due to the frequent occurrence of earthquakes, the more and more bridges and roads are badly damaged by them.Therefore, the study of the seismic design and seismic response analysis of bridge structures are of great significance.Taking the South River Weihe grand bridge of Baoji-Lanzhou railway line for passenger traffic as the engineering example,the content of construction monitoring and the influence factors of linear are briefly described in this paper.At the same time, the seismic response of the bridge is analyzed by the methods of spectrum response analysis and time-history analysis.The main contents and conclusions of this paper are as follows:1.Based on the construction control about linear and stress of the practical engineering of the South River Weihe grand bridge of Baoji-Lanzhou railway line for passenger traffic,this article briefly describes the content of the construction monitoring.And simulation analysis by Midas / Civil software of the bridge, and using linear displacement,and beam master node stress of the theory and linear displacement and measuring stress of the reality comparative analysis to provide appropriate and accurate beam construction formwork elevation.So that the error of the bridge linear displacement and beam stress are within a norm predetermined range, to ensure the smooth closure of the bridge.2.Through the analysis of the four linear influence factors of the concrete density, elastic modulus of concrete, prestressed force control, the main beam closure order can conclude that the greater bulk density and modulus of elasticity of concrete, the bridge late deformation displacement Bridge is smaller, it is easier to analyze and control the actual construction quality, and choosing the correct way to collapse, proper tension prestressed steel beam is very important to reduce the difficulty of construction linear control.3.Through this bridge vibration characteristics analysis,spectrum response analysis and time-history analysis can know that considering pile-soil structure interaction can make the flexible bridge structure becomes larger,structural displacement becomes larger, structural internal force also changes greatly.So whether when progressing the bridge seismic design of structures or seismic response analysis,The pile-soil structure interaction is not negligible.4.With respect to don't consider pile-soil structure interaction,When considering pile-soil structure interaction, the internal forces of the brake pier are reducing, but its displacements are increasing.Meanwhile,The forces and displacements of the brake pier are larger than theother piers under horizontal seismic forces.Therefore, strengthening the seismic design of the brake piers and the bridge bearings is extremely important.