Rigid Cable Mechanical Properties Of Self-anchored Suspension Bridge Analysis

Self anchored suspension bridge is a kind of new structural style interiorly. Seen from the completed and being completed self anchored suspension bridge, we find it is an appropriate and competitive bridge style in middle or small span city bridge design. There are very few self anchored suspension bridges built at home and aboard, its mechanical characteristic as well as the force influence from various control parameter change are not very clear to us. So regarding Pingdinshan Jianshe Road cloverleaf junction—self anchored suspension bridge as project example, we investigated its mechanics characteristic and the force influence from various control parameter change. This article just develops under this background.According to Pingdinshan Jianshe Road cloverleaf junction—rigid self anchored suspension bridge's structure characteristic, we used Midas/civil finite element program, a space finite element calculated model was established. We analysed its static, dynamical characteristic and compared various control parameter. Then we used ANSYS finite element program to calculate the local stress in anchorage zone of the border span and analysed its local mechanical characteristic. Synthesize the work above, we educe conclusions as follow:1. Under the constrant load function the self anchored suspension bridge's main beam maintains its primary elevation and has little displacement downwards; main beam's total section has press function because of the self anchored cable; the whole components's force is under the bridge's design standard, which indicated that the whole bridge's structure force is reasonable. Under the corporate function of constrant load and live load, main beam's displacement, force value and stress value become larger than those under the constrant load; the calculation are all under the bridge design standard. As the cable and suspender have the out-hold frame, they behave rigid under the live load. As the out-hold frame increases their's stifihess, they endure some bending moment besides tensile force.2. This self anchored suspension bridge's vibration appears three type: holistic vertical vibration, distorted vibration and bridge tower transverse vibration. Holistic vertical vibration and distorted vibration appear first, afterwards bridge tower transverse vibration appears, this indicates that the vertical stiffness is lower. Each step's frequency is relatively higher, this indicates that the bridge's stiffness is higher. The first distorted frequency is much higher than the first vertical bending frequency; this indicates that main beam's distorted stiffness is higher. Rigid cable self anchored suspension bridge's basic frequency is higher than flexible cable self anchored suspension bridge, their vibration...