Research On Some Key Technology Problems In The Design Of A Cable-Stayed Bridge With Composite Deck

Based on the key problems in the design of Jiangjin Guanyinyan Yangtze River Bridge in Chongqing, and according to the results of the research project "research on the long span and wide deck composite girder cable-stayed bridge design and key technique of construction", The solutions to the key problems of design of long span and wide deck composite girder cable-stayed bridge have been obtained in the thesis.The structural analysis method in the design of composite girder cable-stayed bridge is discussed firstly. Using the forward analytic method, which is very simple and practical, the whole bridge construction calculation model is built, and the general mechanical characteristics of composite girder cable-stayed bridge is ascertained. Then through the finite element model, the internal force distribution in steel-concrete composite girder in different load conditions is analyzed and the effective measures of active adjustment of internal force distribution are summarized. Secondly, the effective width calculation method in current code is discussed. The defects of this method are pointed out. Then based on finite element analysis, a simplified calculation method of effective width for composite girder cable-stayed bridge is proposed. Taking a real bridge as practical calculation example, the stability of the cable-stayed bridge with composite girder has been analyzed. The mutual relations between the main beam buckling mode and M/N internal force state is gotten. Combining with the calculation example of tensile anchor plate, mechanical behavior of anchor plate in composite girder cable-stayed bridge is analyzed. The results of dynamic and static load model test of anchor plate in Jiangjin Yangtze river bridge are also introduced in the thesis.