The Seismic Response Research About Large-span T-Rigid Frame Bridge With New Type Column-slab High Pier

Abstract:Based on a prestressed concrete T-rigid frame bridge with span of (116+116)m and pier height of112m on the double-track railway, the dynamic characteristics, the seismic performance and the difference of the carrying capacity between the pier-slab’s concrete before cracking and after cracking about the new type column-slab high pier bridge were analyzed, and then, these results were compared with the traditional hollow high pier’s results. The major work and innovative achievements are as follows:1. According to the structural features about the large-span T-rigid frame bridge with new type column-slab high pier, the methods of simulating bearings and soilpile interaction were discussed, the dynamic finite element model of the bridge was established, the dynamic characteristics research was completed. The results show that the bridge inheres lower natural frequency and dense vibration mode.2. The response spectrum analysis and time history analysis were carried out of the bridge. The displacements, internal forces and stresses of the bridge were calculated under the frequent earthquake, design earthquake and rare earthquake. The results show that the bridge is still in elastic stage under the action of the frequent earthquake and design earthquake, the concrete cracked in locally small regional of girder and pier under rare earthquake, the bridge didn’t collapse.3.The dynamic characteristics and carrying capacity about the bridge after the pier-slab’s concrete cracking were analyzed, and then the result before the pier-slab’s concrete cracking was compared with. The results show that the decline range of carrying capacity is smaller than the decline range of stiffness.4. The dynamic characteristics analysis and the seismic response analysis were carried out of the traditional hollow high pier bridge. The displacements, internal forces and stresses of the bridge were calculated under the rare earthquake, after that, the results about new type column-slab high pier bridge was compared with. The results show that the anti-seismic property of the new type column-slab high pier has advantage than the anti-seismic property of the traditional hollow high pier.The analysis methods and research results in this thesis can provide basis for designing and researching the new type column-slab high pier, in the same time, provide a reference for the seismic response research about similar bridge. This thesis has80graphs,41tables,60references.