Analysis And Application On The Vehicle-Bridge Coupling Vibration For Existing Reinforced Concrete Arch Bridges

With China’s rapid development of highway construction, a great number of large-span, newly designed bridges continue to emerge, and at the same time, the old bridges are facing the aging problem. Dynamic testing and analysis technique is playing a more and more significant role in the old bridge reinforcement and health monitoring of all kinds of bridges. Based on the results of previous studies, this thesis conducts an analytical study on the road vehicles, bridge models and the vehicle-bridge coupling relationship. Moreover, the method of self-programming is applied to the analysis of the result of the field test on the background engineering combined with both arches. The main work of the thesis is as follows:1. It is combined with the function of software ANSYS secondary development, with the use of APDL parametric programming method, which can accurately extracts element stiffness matrix, mass matrix and the overall stiffness and mass matrix containing the coupling node, rigid connection and many spatial complex structures. Then through the coordination of displacement and force between two subsystems of vehicle and bridge, with the use of separate iterative method, the author works out Analysis of Vehicle and Bridge coupling vibration System (AVBS) based on FORTRAN platform, which applies to the spatial complex structures of highway bridges.2. The thesis assumes sideway roughness distribution with a random and ergodic property, using the harmonic superposition method, which extends the two-dimensional distribution of the description of longitudinal pavement roughness to a three-dimensional model of road roughness. Based on FORTRAN platform, the author works out simulation module SUB_BPS when simulating deck irregularity, which achieves a three-dimensional numerical simulation of deck irregularity.3. Taking a concrete arch bridge with a missing part of the design information as research background, the author conducts a static and dynamic load analysis on the bridge with the use of self-programming AVBS. Moreover, the thesis compares the results measured from the static and dynamic load test, verifies the reliability of self-programming, and puts forward some evaluations and recommendations on the performance and operational management for the bridge.4. Using the self-programming AVBS, this thesis conducts a further analysis of vehicle and bridge coupling vibration on the engineering background arch bridge. The parametric analysis on the dynamic response of the bridge is under the influence of various factors such as different speeds, the time vehicle into the bridge, distance between vehicles, vehicle load, the number of lanes and vehicles and road irregularity. The thesis evaluates the dynamic performance of the bridge based on the dynamic coefficient, Which can provide some grounds for managerial decisions of the bridge, and can also supplies some research basis for the further analysis of highway vehicle-bridge coupling dynamic response.5. The author has accumulated some experience on the function of ANSYS secondary development when exploring complex bridges.There are102charts,21tables,92references.