Study On Mechanical Performance And Construction Monitoring Of Continuous Curved Grider Bridge

The emergence of the continuous curved grider bridge is necessity of historical progress and it solves the bridges over complex terrain and obey the route request two big problems.But continuous curved grider bridge is different from the straight grider bridge,the stress and deformation is more complex,there is bend torsion coupling effect,cross section from varied,especially for box section,with the increase of span,the cross section structure presents the characteristics of the curvature chang height,an urgent need to further analyze its tensile,compression,bengding,torsion,warping and distortion stress state,to facilitate continuous curved grider bridge design and construction.In this paper,to explore general characteristics of continuous curved grider bridge,by changing the design parameters of the bending radius of 300 meters,such as cross section such as continuous curved grider bridge for different radius of curvature,different thickness of web plate,different spacing of the web,and the paper summarizes the results of the analysis.the etheric exchanges the prestressed concrete continuous curved grider bridge as the engineering background,establelished by using finite element software midas civil 2012 based on the finite element model of whole bridge space beam element,to analysis the mechanical properties in construction stage and a bridge phase.Aiming at construction stage,foucs on analysis of bearing force,deformation,internal force and stress along with the progress in construction stage;to run into a bridge phase,focus on analyzing the mechanical properties of continuous curved grider bridge under different load condition,and the defletion and stress in the most unfavorable load combinations,to verify the safety of the bridge.Due to space limitations,construction monitoring on line monitoring method is introduced,and throught the constrastive analysis of the theoretical data and the measured data,the monitoring method and the correctness of the organization and management system.Through this article reaserch,the following conclusions are obtained.(1)Bridge condition of different radius of curvature on equivalent cross section of continuous grider bridge,such as analysis shows that when the bending radius is more than 100 meters,under the action of dead load,for continuous curved grider bridge to maximum deformation,internal force and stress of a rough analysis,considering as the straight grider bridge,and the torque increase with the decrease of the curvature radius.When bending radius under 100 meters,it need to analysis alone.(2)Under the action of dead load,the change of thickness of the web has little influence on the mechanical properties to the equibalent cross section of continuous grider bridge,the change of the web plate spaceing has particularly evident influence to torque,chang to 74.9%,but it has little influence to other mechanical properties.(3)In construction process,in each construction stage,the stress of the wholebridge is under control,construction is safety and reliability.(4)Run into bridge stage,the deflection and stress are in their respective under the most unfavorable load combination,meet the requirements of bridge design so it is safe.(5)By taiping A ramp bridge engineering practice,prove that this monitoring is successful,theory and methods of monitoring and management system is correct,it has stronger practicability and value of popularization and application.