To meet the needs of the rapid development of railway construction to high-intensity seismic areas in China,a modular prefabricated bridge pier system with grouted corrugated tube connections is proposed to solve the problems of weak connection positions between pier columns and caps of traditional prefabricated piers.By pouring the pier cap and the plastic region of the pier body together and setting a locally unbonded segment at the pier bottom,the seismic performance of the bridge pier is strengthened.A model of locally unbonded monolithic cast-in-place railway gravity pier and a model of locally unbonded prefabricated railway gravity pier were created to carry out pseudo-static tests,and the seismic performance of prefabricated railway gravity pier was studied by finite element analysis.The results show that the overall connection performance of the locally unbonded prefabricated bridge pier is stable,and it can dissipate energy through the swing between the plastic region at the pier bottom and the pier body and segments.The failure mode of the locally unbonded prefabricated pier is characterized by bending failure in the plastic region at the pier bottom,without damage location transfer phenomenon.Compared with the locally unbonded cast-in-place bridge pier,the locally unbonded prefabricated pier has a reduction in the height of the equivalent plastic region,and its lateral bearing capacity and energy dissipation capacity are significantly improved.It also exhibits good displacement ductility and can adapt to larger loading displacement,with an increase of the final cumulative energy consumption of 64.3％.The joint position of the structure is stable and reliable,the equivalent stiffness is basically the same under the same load displacement,and the seismic performance is obviously improved.The precast segment division has little influence on the seismic performance of prefabricated railway gravity pier.
关键词
铁路/重力式桥墩/预制/拼装/局部无黏结/抗震性能/破坏模式/拟静力试验
Key words
Railway/Gravity piers/Prefabricated/Assembled/Localized unbonded/Seismic performance/Failure mode/Pseudo-static test
维普
万方数据