1.长安大学旧桥检测与加固技术交通行业重点实验室,陕西 西安 710064
2.中电建路桥集团有限公司,北京 100048
周敉(1977—)男,教授,博导,博士。主要从事桥梁抗震方面的研究。E-mail:zhoumi@chd.edu.cn
纸质出版:2021-10-15
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周敉,朱国强,刘平均等.软土地区高墩梁桥抗震支座选型及横向约束构造研究∗[J].防灾减灾工程学报,2021,41(05):936-945.
ZHOU Mi,ZHU Guoqiang,LIU Pingjun,et al.Research on Seismic Bearing Type Selection and Transverse Restraint Structure of High Pier Beam Bridge in Soft Soil Area[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):936-945.
周敉,朱国强,刘平均等.软土地区高墩梁桥抗震支座选型及横向约束构造研究∗[J].防灾减灾工程学报,2021,41(05):936-945. DOI: 10.13409/j.cnki.jdpme.201906044.
ZHOU Mi,ZHU Guoqiang,LIU Pingjun,et al.Research on Seismic Bearing Type Selection and Transverse Restraint Structure of High Pier Beam Bridge in Soft Soil Area[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):936-945. DOI: 10.13409/j.cnki.jdpme.201906044.
为了研究软土地区地震作用下高墩先简支后桥面连续梁桥的支座选型及横桥向抗震约束问题,选取了普通板式橡胶支座、钢阻尼滑板支座、LNR橡胶支座和HDR高阻尼支座四种支座类型,以软土地区某(4×30) m跨径高墩先简支后桥面连续梁桥为例,进行了延性抗震体系和减隔震体系抗震设计对比以及设置挡块的横桥向抗震约束效果研究。结果表明:软土地区高墩先简支后桥面连续梁桥墩柱配筋率主要由E1地震作用下墩底截面偏心受压检算工况决定,采用减隔震体系并不能降低桥墩配筋率。通过对采用四种不同支座桥梁的内力、墩梁相对位移以及配筋率方面综合分析可知,软土地区高墩先简支后桥面连续梁桥的周期较长,这类桥梁抗震关键问题是防止落梁、减小墩顶位移。采用普通板式橡胶支座并合理的设计纵横向防落梁装置的延性抗震体系更适宜于软土地区高墩梁式桥,合理设计抗震挡块可以起到很好的横向约束作用,避免横向落梁的发生。
In order to study the bearing type selection and transverse seismic restraint of bridge deck continuous simply⁃supported girder bridge with high piers under earthquake in soft soil area, this paper selected four types of bearings, including ordinary laminated bearings, steel damped sliding bearings, LNR rubber bearings, and HDR high damped bearings, and took a 4*30m girder bridge of bridge deck continuous simply⁃supported girder bridge with high piers in soft soil area as an example. This paper studied the seismic design comparison of the ductile seismic system and seismic isolation system and the seismic restraint effect of transverse with the blocks. The results show that the reinforcement ratio of the piers of bridge deck continuous simply⁃supported girder bridge with high piers in the soft-soil area is determined by the eccentric compression work condition of the bottom of the piers under the E1 earthquake, using seismic isolation system cannot reduce the reinforcement of the pier. Through comprehensive analysis of internal force, relative displacement between piers and girders and reinforcement ratio of four kinds of bridges with different supports, it can be seen that the period of high piers in soft soil area is longer, and the key problem of seismic resistance of such bridges is unseating prevention and reduce displacement of pier top. The ductile seismic system with laminated bearing and reasonable design of longitudinal and transverse unseating prevention device is more suitable for high pier beam bridge in soft soil areas, and rational design of the blocks can play a very good role of lateral restraint and avoid the occurrence of transverse unseating.
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