Abstract:In order to explore the static stability of sea crossing cable-stayed bridge with double arc pylon, firstly, the engineering overview and wind parameters are introduced, and the calculation process of transverse static gust load of main beam is given based on the site conditions of bridge site; Secondly, based on MIDAS / civil 2019, a three-dimensional spatial finite element model considering cable geometric nonlinearity is established, and the natural vibration characteristics of the structure are given; Finally, the static and stability problems under possible loads in the operation stage are discussed. The research shows that the internal force of the main beam is the largest at the tower beam connection, while the maximum internal force of the bridge tower occurs at the lower beam connection, and the maximum bending moment and shear force of the bridge tower are 3.05e + 05kN.m and 1.53E + 04kN; The maximum vertical displacement in the middle span of the main beam and the longitudinal displacement at the top of the tower are 52.52mm and 17.364mm respectively, which meet the requirements; Under the action of cross wind, the displacement of tower top and the transverse displacement of main beam midspan are 20.384mm and 6.81mm respectively, and the stability coefficient is greater than 4, so the overall instability problem will not occur under the joint action of various loads in the operation stage.
