局部采用PVA-ECC的铁路重力式桥墩抗震性能研究
Study on seismic performance of railway gravity bridge piers with locally adopted PVA-ECC
邢斯宇 1丁明波 1鲁锦华1
作者信息
- 1. 兰州交通大学 土木工程学院,甘肃 兰州 730070
- 折叠
摘要
为探究通过在桥墩墩底局部采用聚乙烯醇纤维增强混凝土(PVA-ECC)来提高铁路重力式桥墩的抗震性能的可行性,设计并制作2 个配筋率为1%的桥墩缩尺模型,其中1 个桥墩模型在墩底局部采用300 mm高度的PVA-ECC材料,另外1 个普通混凝土桥墩模型为对比模型.通过对桥墩模型进行低周往复荷载试验,研究桥墩的破坏形态,并分析对比桥墩模型的滞回曲线、骨架曲线、累积耗能能力、位移延性以及刚度退化规律等抗震性能指标.研究结果表明:在桥墩墩底局部采用PVA-ECC材料,桥墩模型的承载能力、累积耗能能力、刚度以及位移延性系数均得到一定程度提高.研究结果验证了墩底局部采用PVA-ECC材料能够有效提高桥墩的抗震性能.
Abstract
In order to improve the seismic performance of bridge piers,the feasibility of using polyvinyl alcohol fiber rein-forced concrete(PVA-ECC)to improve the seismic performance of railway gravity bridge piers at the local bottom of bridge piers was explored.Two scale models of bridge piers with the reinforcement ratio of 1%were designed and produced,of which one pier model was made of 30 cm height PVA-ECC material locally at the bottom of bridge pier,and the other one ordinary concrete pier model was used as comparison model.Through the low-cycle reciprocating load test on the bridge pier models,the failure morphology of the piers were studied,and the seismic performance indicators such as hysteretic curve,skeleton curve,energy dissipation capacity,displacement ductility and stiffness degradation law of the pier models were analyzed and compared.The results show that the bearing capacity,energy dissipation capacity,stiffness and displacement ductility coeffi-cient of the bridge pier model are improved to a certain extent by using PVA-ECC materials locally at the bottom of bridge pier.The test results verify the feasibility of using PVA-ECC materials locally at the bottom of pier to improve the seismic performance of bridge pier.
关键词
铁路重力式桥墩/PVA纤维增强混凝土/拟静力试验/抗震性能Key words
railway gravity bridge pier/PVA fiber reinforced concrete/pseudo-static test/seismic performance引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据