Internal force analysis of the girder and arch combination bridge with continuous rigid frame and V-shaped support

The design of V-shaped piers of the beam-arch combination system bridge with continuous rigid frame was introduced.Using SMAD finite element procedure,the influences of the size of pier bodies and boundary conditions on the whole structure were analysed.Through optimiation of computation,the adverse effects of shrinkage,pre-stress and second internal forces caused by creep and temperature,etc.,on the structure were investigated and managed to be eliminated accordingly.The lateral stiffness ratio of the tie beam to the arch rib of bridge is 1926∶1.Constructing the arch of main girder after completion of main shrinkage and creep,and erecting the suspenders by the method of twice regulating supporting cables,the lateral stability of frame arch bridge with flexible bars was ensured.Three-dimensional seismic responses analysis of the bridge shows that the seismic forces of all upper parts of the bridge are not the control internal forces of the bridge,and illustrates the structural construction of the bridge has a good seismic performance.