| In this paper,the reasonable value of the target reliability index based on the design and service life of the concrete girder of long span cable stayed bridge is studied,through analysis of domestic and foreign literature research content,select the calculation method based on reliability theory,to large cross cable-stayed bridge girder when the variable reliability are analyzed and studied,and to determine the large span cable-stayed bridge girder based on years of target reliability index is used in the design.The main contents are summarized as following:1.The distribution of the basic random variables in the reliability analysis of the main girder of the super large span cable-stayed bridge is determined.Include dead load model and vehicle load model and its statistical parameters.And through the ANSYS software modeling and analysis of the large span cable-stayed bridge main girder of the resistance,the preparation of the corresponding MATLAB program calculation of large span cable-stayed bridge main beam reliability index.2.Through the analysis and comparison of a large number of literatures,the main factors influencing the attenuation of structure resistance and its probability model are discussed.The resistance attenuation of main girder section of long span cable stayed bridge as the research object.Through three kinds of resistance of structural attenuation model has been studied in this paper.The large span cable-stayed bridge girder of time-varying function of the reliability index and reliability index attenuation function,for large span cable-stayed bridge girder target reliability index and lays the foundation.3.Given the long span cable stayed bridge girder based on years of target reliability index is used in the design,the target reliability index to ensure the long-span cable-stayed bridge girder in design using the length of the minimum reliability index can still meet the current specification requirements. |
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