Assessment Study, Based On The Beam Bridge Structural Capacity Of The System Reliability Theory

The bridge structure's reliability problem is quite important, for its predominant position in the network of communications and transport. It's gradually becoming a hotspot concerned by both domestic and overseas scholars.System reliability theory is a newly emerging interdisciplinary subject. Utilizing the system reliability theory into bridge structure assessment, It could assess the reliability of bridge structure well and truly, supervise bridge structure design, and provide a set of utilized standard for assessment of different bridge style. In this dissertation, Structure Reliability Theory is used to research for evaluate the structure bearing capacity. The dissertation generalizes the fundamental theory of construction reliability. Founded on the new standard and error delivery formula, It gets the probability assessment model of the bearing capacity of the typical reinforced concrete components; The dissertation summarizes the existing calculating method of system reliability, and analysis their characteristic and scope of application respectively; The dissertation introduces the systematic analyzing thought, and studies the probability analyzing methods. It sums up six probability analyzing methods of the bearing capacity of the girder bridge: (1)A program is working out to calculate the parameters which are used to count the system reliability by means of "JC" method; (2)The dissertation analyzes the influence of group-girder bridge damage on construction system, and discusses the systematic failure criterion of concrete reinforced group-girder bridge; (3)Girder bridge structure elastic-plasticity analyzing model is set up by finite element program(ANSYS); (4)It exerts incremental load method and branching-constraint method simultaneously to search the chief failure mode of construction system; (5)Sep-by-step recursive limit-state equation is gained by means of recursive linear algorithm; (6)Analyzing the design feature of the girder bridge and its influence to the system reliability, the dissertation get the correlated elements that should be taken in to account in the probability assessment of girder bridge; the dissertation set up assessment flow system of bearing capacity of girder bridge and present an example, and the dissertation studies the influence of these parameters on system reliabilityThe research findings of the dissertation can give instructions to system reliabilityassessment on bearing capacity of girder bridge.