The Modeling Techniques Study On The Precast Hollow Slab Bridges And Experimental Verification

In this dissertation, which funded by a 20 meter precast hollow slab bridge, method of theoretical calculation of finite element combining with loading test is performed to study the modeling technique of precast hollow slab bridge. The major work and results in the paper are summarized as follows:1. It summarized the emergence and the development of hollow slab bridge, and systematic elaborated the main characteristics of this type bridge. Also the present domestic research works of finite element calculation of the precast hollow slab bridge superstructure were introduced.Then the problems existed and the main works of this paper were pointed out.2. Finite element model of precast hollow slab bridge which based on the method of beam and girder construction is built.3. Parametric analysis of lateral connection, quantity of beam, pavement, support saddle, guardrail, and the main influencing parameters were picked up. The results show that: lateral connection and support saddle are much more important, guardrail takes second place and pavement is relatively negligible. For the span of precast hollow slab bridges for the 20m run, there's making no difference to the result as long as the girder space no longer than 2m.4. Comparison of static load test and theoretical calculation shows: under the testing arrangement, whether positive load or unbalance load, result of model based on rigid connection of beams is much close to experimental data, and result of model based on elastic bearing is much better than general bearing. That shows Finite element model based on rigid connection of beams and elastic bearing is more suitable to actual strained condition of hollow slab bridge.