Static And Dynamic Analysis Of Single Steel Tower Cable-Stayed Bridge With Steel Box Girder And Its Optimization Of Cable Tension

The thesis puts forward the scheme design of single tower of double pylons and steel box girder based on 130+130m single tower cable-stayed bridge, and then carrys out its static and dynamic analyses to verify the feasibility of the design scheme. In the first part, a finite element analysis software MIDAS/CIVIL 2011 is applied to build a finite element model on the basis of multi-girder model to analyze the stress and displacement of the bridge structure under such single actions and combined actions as dead load, moving load, across-wind load, temperature change and temperature gradient of the girder cross-section; and to calculate the natural vibration modes of the bridge and the stress and displacement responses under seismic action. In the second part, a finite element software ALGOR is applied to build a spatial model of the whole bridge based on integrated element with 27m refined elements for about 310000 of the total elements. This part also calculates the detailed stress on the steel box girder under action of dead load and standard vehicle load. The third part applies the finite element analysis software MIDAS/CIVIL 2011 to establish single-girder model, calculate the stress of girder and cables of the four tensing procedures, and obtain feasibility of the program by comparing the calculated results, thereby to provide referential observation for construction.