Supported Beam Bridge Deck Continuous Fabric Performance Comparative Study

Lots of continuous deck structures are used in highway bridge in China, including rigid-type continuous deck structure and rod-type continuous deck structure and their variants. On the one hand, the bridge designer is lack of adequate theoretical basis and related theoretical literature on how and why to choose the continuous deck structures during the designing. On the other hand, the continuous deck structure is one of easily damaged parts in practical engineering, causing the loss of continuous function, the irregularity of bridge surface and the vehicle bump phenomenon, which increase maintenance. In this dissertation, there will be a theoretical analysis of these problems and two common continuous structures. The major completed work and the main conclusions are as follows:1. Research status quo on domestic and overseas for continuous deck structures is summarized systematically, including a detailed analysis of the reasons that continuous deck structures are damaged.2. Analytical method is used to derive the maximum tensile stress formula about continuous deck structures under the action of these loads car, braking force, temperature and so on.3. Based on linear elasticity theory, a fine continuous deck structure model is established with a large finite element program, whose engineering background is simply-supported continuous deck T beam with 2 spans of 25 meters each the stress conditions of different forms of continuous deck structures are calculated under the car live load, temperature variation, braking force and the load combination and etc.4. Based on elastic-plastic theory, the nonlinear finite element model is established, which is used to analyze and compare states of stress and fracture in different continuous deck structures during the loading process.5. Analysis shows that:1) Two continuous deck structures soon turn into plastic state and then emerge cracks under the load combination. Currently, it is hard to avoid cracks and they are structures working with cracks; 2) The tensile stress and the level of crack in rod-type continuous deck structure are significantly better than rigid-type continuous deck structure during the loading process.6. According to the theoretical analysis, improvements about the continuous deck structural performance are proposed. Presented conclusion of this dissertation may be used for reference by engineers in design.