Study On Structural Behavior Of Through And Half-through Arch Bridge Based On CFRP Suspenders

Suspenders in through and half-through arch bridge are suffering long-time complex mechanical loading patterns and atmospheric attacks,and are easily affected by fatigue and corrosion,which may cause the bridge collapse.Because of the corrosion resistance and fatigue resistance of caron fiber(CFRP),it can make up for these shortcomings of steel.Therefore,it can be considered to replace the steel tensile component with CFRP component to avoid the occurrence of such problems and to reduce the maintenance costs.In addition,the high strength and light quality of CFRP material meet the requirements of designing and constructing large span bridge and new type structure bridge.In this paper,the influence of the replacement of CFRP tension members on the structural behavior of tandem arch bridge is analyzed,and the corresponding solutions are put forward for the problems in practical engineering application based on the material properties of CFRP cable.The main contents may include the following four aspects:(1)This paper summarizes the main problems of the tensile members,especially the steel suspender components,and analyzes the typical cases of the collapse of the arch bridge caused by the failure of the boom in recent years,and the application research progress of the CFRP cable in the bridge engineering were introduced.(2)According to the difference of material properties between the CFRP cable and the steel cable,the ANSYS finite element model of the arch bridge was established in accordance with the thrusted arch bridge only installed the suspenders.Based on the static analysis,structural behavior.of the arch bridge with replaced CFRP cables under different replacement principles and scheme was studied.The rationality and feasibility of the whole suspender replacement and the combination scheme are verified,which lays the foundation for the further study on the structural behavior of the arch bridge.(3)Taking the five-edge bridge as the engineering background,the ANSYS finite element model of the neutral-type tie-rod basket arch bridge is established,and the whole replacement and combination replacement scheme of the tie-rod arch bridge is proposed and optimized.The static response including the suspender force and the main beam deflection of the arch bridge under the dead load,the lane load and the temperature load are analyzed,and the dynamic characteristics of the arch bridge and the stability of the arch bridge are analyzed.(4)In view of the poor shear resistance of CFRP cable,the construction and anchoring method of traditional cable is difficult to meet the requirements of CFRP in the engineering application.It is proposed that the CFRP laminated pinned belt structure is used in the boom.The static and fatigue tests of CFRP laminated pin-loaded straps are carried out,and the test results are analyzed,which lays the foundation for the further application research of CFRP ring structure in practical engineering.At the same time,the effect of sagging effect on the stiffness of CFRP tie bar was analyzed.