Analysis Of Mechanical Behavior Of Flexible Suspension Steel Box Arch Bridge On Integral Deck Of Double Track Railway

Based on the engineering background of an intercity railway crossing a city's busy high-speed steel box arch bridge,this paper analyzes the structural stress of the entire bridge construction process through simulation calculations,construction monitoring,and field tests.The specific research content is as follows:(1)Based on the finite element software,this paper analyzes the safety of the walking-type pushing process structure;this paper draws the stress and deflection time-history curves under the critical section of the structure;through field measurement,this paper obtains the stress and deflection of the key positions of the structure A comparative analysis chart of calculated values and measured data;this article creatively proposes a method,device,and system for synchronous monitoring based on BIM visualized push structure;(2)The linear equations are established based on the influence matrix method,and the cable force value is adjusted to make the boom reach the predetermined target cable force.In this paper,details of cable force optimization and bridge cable force adjustment during the construction phase based on the influence matrix method are given.Application;This paper proposes an empirical method to avoid the singular matrix of the cable force influence matrix,and summarizes a method for determining the influence matrix of an arch bridge or cable-stayed bridge with a secondary tension process;this paper uses a magnetic flux sensor and cable force The method of dual control of the dynamic tester strengthens the cable force control to obtain the measured cable force value and compare it with the calculated value.This paper analyzes the stress and deflection changes of the key cross-section of the structure during the tensioning of the boom twice,and calculates the steel box;(3)Aiming at the special case where the box girder is not installed on the steel box arch bridge,the mechanical behavior of the structure under static conditions is studied in this paper;the natural vibration characteristics of the steel box arch bridge are analyzed in this paper.The dynamic characteristics of the structure when theframe-mounted machine passes through the steel box arch bridge are researched;through field measurement,the measured data of the stress and deflection of the steel box arch structure are obtained in this paper,and compared with the calculated values;(4)The steel box arch bridge is an orthotropic steel bridge deck + concrete slab+ CRTS? slab ballastless track structure,which is the first time that it is used in China.This paper introduces the pavement construction steps of a new bridge deck structure.Later,from the three aspects of internal force,stress and deformation of the structure,this paper analyzes the mechanical behavior of the bridge deck pavement under different working conditions.This paper first gives the CRTS III in the cold season The time-history curve of the stress and temperature change of the slab ballastless track base plate,and the time-history diagram of the stress change of the bridge deck concrete slab and the orthotropic slab is measured at the same time;(5)This paper tested the static load performance of the steel box arch bridge by using DF4 locomotive and N17 flatbed(loaded with standard concrete test blocks)on site to obtain the mechanical behavior of the steel box arch bridge under 21 kinds of working conditions.This paper studies the load efficiency of the test section stress and deflection;In the pulsation test,the damping ratio of vertical bending vibration and torsional vibration of the structure is obtained in this paper;(6)CR400AF China Standard EMU is selected in this paper.Each wheel-rail contact surface is used as the loading point.Based on the finite element analysis software,a wind-vehicle-rail-bridge coupling simulation model is established to consider wind load effects and track irregularities.From four aspects of sports car tests at different speeds,sports cars at different groups,sports cars at different lines,and sports cars at high speeds,this paper studies the mechanism of bridge coupling vibration structure under complex operating conditions.Provide reference for the dynamic performance of the structure under high-speed railway acceleration.