Analysis Of Static Characteristics And Economy Performance Between Continuous Rigid Frame Bridge And Extradosed Cable-stayed Bridge

In this thesis,two completed dextradosedcable-stayed bridge and continuous rigid frame bridges with the same spans of 125m+250m+150m are taken as the engineering background.The static characteristics and economic performance of these different types of bridges will be compared and summarizes the similarities and differences in this thesis,It will provide reference for the bridge type selection in the future.The main work of this thesis includes as following:(1)The finite element model of two bridges was established with bridge structure analysis software Midas Civil.The static characteristics of two Bridges at the bridge completion stage and the maximum cantilever stage and underload combination were analyzed and compared,including the internal force of the main girder,the deflection and the stress level of the upper and lower flange.(2)The static characteristics of the two bridges under single load were analyzed and compared,including vehicle load,system temperature,temperature gradient,support settlement.The purpose is to analysis the sensitivity of the two bridge types to different single load.(3)The influence of concrete shrinkage creep and prestress loss on the structure of two bridges is analyzed and compared,which can be used as a reference for comparing the long-term performance of two bridges.The main works include the static characteristics of the structure caused by shrinkage creep in the first 20 years and the influence of different types of prestress loss.(4)Analyzing and comparing the economic performance of the two bridges.Economic performance indexes mainly include the amount of three materials(concrete,steel reinforcement,prestressed steel strand),the comprehensive cost corresponding to the three materials and the construction period of the two Bridges,so as to compare and analyze the economic performance of the two bridges.