Mechanical Analysis Of Concrete Filled Steel Tubular Arch Bridge Under Different Section

Concrete-filled steel tubular arch Bridges are widely used in span Bridges because of their advantages in force,cost and aesthetics.Based on the present situation,this paper takes a Reservoir Bridge as the research object,the main contents are as follows:(1)The concrete filled with dumbbell-shaped steel tubular arch ribs and the dumbbell-shaped steel tubular arch ribs is not filled with concrete.The dumbbell-shaped arch ribs are replaced by truss arch ribs with three different arch rib parameters under Midas Civil,a large-scale bridge special finite element software.Finite element model of concrete-filled steel tubular arch bridge.(2)The effects of different arch rib parameters on the static performance of CFST arch bridge are studied.The internal forces,the displacement of the ribs and the internal forces of the boom are compared under different working conditions.It is concluded that the composite performance of transverse dumbbell arch rib structure is the best.(3)The influence of different arch rib parameters on the dynamic performance of CFST arch bridge is studied.The important dynamic parameters such as fundamental frequency,period and vibration mode of the CFST arch bridge are analyzed.Based on the seismic design rules of highway bridge(JTG / T B02-01-2008),The internal forces and displacements of the full-bridge under the bridge-to-bridge and cross-bridge seismic actions are analyzed.The results show that the basic frequency of the arch rib filled with concrete slab is 0.3442,the basic frequency of the dumbing-shaped arch rib without concrete slab is 0.375,and the basic frequency of the truss arch rib is 0.292.(4)The influence of different arch rib parameters on the stability of CFST arch bridge is studied.The stability safety factor of the structure under self-weight and dead load and live load are analyzed by linear elastic theory.The stability of the structure under different arch rib parameters.The buckling modes and eigenvalues of the three structures are obtained,and the results show that the stability coefficients of the transverse dumbbell arch rib(concrete filled with slab)and the dumbbell arch rib(concrete not filled with slab)are not different,and the stability is good.To sum up,the static,dynamic and stability properties of the transverse dumbbell arch rib are better than Other structures.