Design And Research Of Self-anchored Suspension Pedestrian Pipeline Bridge

Taking a footbridge for an example of a series of calculation and research. Bridge adopts steel truss and double deck structure and using the self-anchored suspension bridge design. Through the software "Midas" build the bridge model,a 3 d model calculation and analysis. Include linear bridge, the state gets under empty cable partial quantity and under the operation state live load, temperature load and wind load conditions of internal force and displacement of the bridge. Because of the particularity of the bridge, first choose the thin-walled steel tube to calculate.In fatigue calculation unqualified cases we can choose using steel tube concrete material section, concrete-filled steel the self-anchored suspension bridge is rare. (1) By change the supporting between main girder and the main tower to the spring supporting,can minimize tensile stress of concrete and makes the boom force more uniform, through calculation make ideal spring stiffness scope; (2) There is no corresponding standard on steel tube concrete creep, it influence in the heavy section stress distribution.Through the two units who have common nodes simulation internal force redistribution, at the same time, use the relative humidity is 90%, and the theory of component is big enough to consider the thickness of the core concrete closed environment conditions and through the literature proposed elastic modulus of concrete, by change stiffness of the of concrete, automatic adjustment internal force of concrete and steel pipe; (3) There is no corresponding standard for the fatigue problem of steel tube of concrete, the literature put forward the node standard fatigue calculation of the concrete filled steel tube stress amplitude can be divided by the coefficient of 1.8 to reflect the steel tube concrete relative to the pipe to improve the performance of fatigue, on the basis of concrete filled steel tube fatigue can meet calculated daily requirements; (4) Pedestrian incentive calculation, a combined German standard EN03 calculate this bridge resonance acceleration response, and using the TMD vibration reduction set, and get better results.