摘要
预制拼装钢筋混凝土(RC)墩柱与承台连接节点的关键构造及其抗震性能是强震区应用预制装配技术需要解决的关键问题。目前灌浆波纹管连接预制拼装RC桥墩主要应用于非强震区,其抗震性能和地震失效模式研究远落后于工程实践,针对此类问题,采用灌浆金属波纹管锚固钢筋技术连接预制拼装RC墩柱与承台,开展预制拼装RC墩柱拟静力往复加载试验研究。通过对比分析预制拼装RC墩柱与现浇RC墩柱的损伤演化过程、局部钢筋应变、失效模式和非线性力学行为评价基于灌浆金属波纹管锚固连接的预制拼装RC墩柱的抗震性能。结果表明:基于高强砂浆灌浆金属波纹管锚固连接的预制拼装RC墩柱的抗侧强度和现浇墩柱基本一致,但位移延性和耗能能力略低于现浇桥墩;预制拼装RC墩柱的损伤主要发生在墩底与承台接缝层的上下界面处以及墩柱底部塑性铰区域,承台内预埋波纹管锚固钢筋均未发生黏结滑移破坏;基于灌浆金属波纹管锚固钢筋连接技术可应用于强震区预制墩柱与承台的拼装连接。
Construction detail and seismic performance are the key problems experienced by precast reinforced concrete(RC) bridge column-pile cap joints used in seismic regions. Currently, precast RC bridge pier columns anchored by grouted corrugated ducts are primarily used in mild earthquake zones, and research on their seismic performance and seismic failure modes is far behind engineering practice. Reinforcement bars anchored by grouted corrugated ducts were used for precast RC bridge pier columns in this study, and quasi-static cyclic tests were performed on the precast pier columns. The damage evolution process, local reinforcement strain, failure mode, and nonlinear behavior of precast and cast-in-place bridge pier columns were analyzed and compared, and the seismic performance of precast and cast-in-place RC bridge pier columns was evaluated. Results indicated that the seismic performance of the precast and cast-in-place RC bridge pier columns are in agreement with respect to the main seismic performance indices, such as lateral strength;however, the displacement ductility and energy dissipation character are slightly lower in precast columns. The main damage suffered by the precast RC bridge column in the experiment occurred in the joint opening and plastic hinge regions;bond-slip failure was found during the testing. It can be concluded that reinforcement bars anchored by corrugated grouted ducts are a suitable technology for use in precast bridge pier columns in seismic regions.
作者
贾俊峰
郭扬
宋年华
朱焰煌
杜修力
耿琳
JIA Jun-feng;GUO Yang;SONG Nian-hua;ZHU Yan-huang;DU Xiu-li;GENG Lin(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;China Highway Engineering Consultants Corporation, Beijing 100089, China;China Construction Fourth Engineering Division Corp. Ltd., Guangzhou 510665, Guangdong, China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2018年第12期211-220,共10页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51578030
51778024)
北京市科技新星项目(Z181100006218053)
北京市青年拔尖人才培养计划项目(CIT&TCD201704027)
关键词
桥梁工程
抗震性能
拟静力试验
预制拼装桥墩
灌浆金属波纹管
bridge engineering
seismic performance
quasi-static testing
precast bridge column
corrugated grouted metal duct
