Shake Table Tests Study On Seismic Performance For Pre-cast Segmental Bridge Columns With Dry Joints

With the development of focus on rapidity of construction,little influence on existing traffic,minimal impact to the surrounding environment,the precast segmental construction technology is paid more and more attention.However construction technique of precast segmental has always been used in bridge upper structure,it is appropriate for subtructures in recent ten years. So there is still a lack of systematic reaserch on how is seismic performance of precast segmental bridge columns.In this background,the dissertation,combining with the status of related research at home and abroad, is focus on the seismic performance of precast segmental bridge columns through shake table test methods,aimed at discovering the seismic failure mechanism of the precast segmental bridge columns,and studies the nonlinear finite element analysis of segmental bridge piers, trying to find effective analysis method of precast segmental bridge pier.In summary,the main contents of the dissertation are described as follows:①Based on comprehensive reading of related literature home and abroad,the present and the future application situation of precast segmental construction technology of prestressed concrete bridge,the type of precast segmental bridge columns and their mechanical character,the experimental and analytical research results of that,were reviewed and summed systemly.②For discovering the seismic performance of precast segmental bridge columns, an experimental project was desighed.The experimental project was carried out shake table test.The self-compacting concrete was used to cast segmental pile model.③Through the shake table test,the dynamic properties,the damage process,the opening of the joints,the displacement response under same peal(gravity acceleration PGA)of the bridge columns were gained,④Based on Opensees,considering the configure properity of precast segmental bridge columns,the fiber beam-column analytical method was used to analyze the shake table specimens nonlinear dynamic time-history loading.In this analytical method,the special problem of precast segmental bridge columns,such as,the joints,the unbonded prestressing tendons,the fitted analytical methods were presented which were based on the test.And then,the specimens were analyzed under nonlinear dynamic time-history loading with the method.At last,the calculated results and the xperimental results were compared.Compared the results with the experimental results,the fiber beam-column analytical method was reasonable and were effective analytical method for precast segmental bridge columns.