Consider Pile Soil Structure Interaction Of The Large Span Of Short Pier Continuous Rigid Frame Bridge Static Performance Analysis

Due to a combination of long span continuous rigid frame model T rigid frame and the characteristics of continuous girder bridge with the development of the bridge construction,in order to adapt to the upper structure under prestress and concrete shrinkage and creep deformation with high piers,and restricted by hydrogeological condition such as some large span continuous rigid frame bridge design into a pudgy,whether it can adapt to the stress of the continuous rigid frame,it is worth further research and analysis.Based on the engineering background of a long-span short pier continuous rigid frame bridge,the following research:1 Combined with pier deformation mechanism and computation scheme of commonly used single limb pier and double piers of continuous rigid frame bridge carries on the contrast analysis,it is found that the double leg thin-walled solid or hollow pier is more suitable for short pier continuous rigid frame bridge.2 The use of Midas/civil established directly embedded in the solid model method with an engineering background,due to the pier stress is not ideal after improved is established with consideration of the effect of the whole pile model.3.Based on the engineering background of the solid pier size to get the size of hollow pier,and comparative analysis of solid pier,the results indicated that the main pier pier top displacement in the section of the cantilever construction changed little and in closure stage is large,and the whole pile model calculation of pier top displacement than directly embedded solid model,especially in the closing stages,the difference can reach 73%,but after 10 years,the displacement of the bridge is equal to the displacement;in the construction process,the two leg of the pier has a tendency to move closer together,the temperature rising load will make the main pier deviated from the direction of the cross direction,cooling load will make the main pier to cross direction;calculation of solid pier stress than hollow pier of the small difference of about 4MPa;for the internal forces of the main girder little difference,calculate the hollow pier than solid pier of the slightly larger within 1%,and directly embedded solid model and the whole pile model calculation of internal force of main girder difference is not large in less than 5%.4.By changing the height of pier,the stress variation law of solid and hollow pier is analyzed and compared,the results show that the displacement of bridge at the top of bridge pier increases with the increase of the height of pier;two kinds of model calculation of the pier top stress with the increase of high pier is more and more tend to be more consistent when the pier is short,the foundation should be considered,the height of the pier can not be considered,the height of the specific boundary is about 40m;when the pier is shorter,the solid pier is more reasonable than the hollow pier,and the hollow pier is more reasonable;the internal force of the main beam at the top of the main pier has a great relationship with the form of the bridge pier;when the pier height is less than 20 m,the calculation of the internal force of the main beam should be considered based on the calculation results.