Structural System Parameters Influence Analysis Of Twin-Tower And Double Cable Plane PC Girder Cable-stayed Bridge

This paper takes DaMen Bridge in Wenzhou, Zhejiang, as the engineering background, researches the mechanical Influence of structural system parameters of twin-tower and double cable plane PC girder cable-stayed bridge. Wenzhou DaMen Bridge is a concrete cable-stayed bridge with span arrangement of135+316+135m. Using the finite element method, this paper analyses the deformation and stress response by changing relevant parameters of DaMen Bridge’s space truss model with MIDAS software.Using the response, this paper analyse the trend furtherly. This paper mainly complete the following aspects:(1) Introduction of design and construction of bridge girder, main tower, inclined cable, substructure and auxiliary project of DaMen Bridge presents a clear basic design method of this bridge.(2) Through the calculation and analysis of internal force and stress of girder and main tower and cable force, reasonable internal force distribution of girder and main tower and reasonable cable force distribution has been clear, verifying the rationality of the structure system, to ensure the smooth operation of the system implementation.(3) Concrete beam segment error weight, cable force error, and prestressed error are a great influence of the state of the cable-stayed bridge. Use the finite element analysis software to quantify the structural response of DaMen bridge, to obtain the structural displacement response and stress response sensitivity characteristics of the error.(4) Tower beam connection, side span ratio of stiffness, tower height, tower and girder stiffness are important system parameters of the bridge. By changing the system parameters of DaMen bridge with finite element analysis, exploring the key system parameter change on the structure effect and temperature effect of live load, the optimization direction of system parameter is proposed.