摘要
低矮桥墩在高速铁路中被广泛采用,该类桥墩具有低纵筋率、低剪跨比、纵桥与横桥向剪跨比差别大等特点.为比较低矮桥墩纵桥与横桥两方向的抗震性能,根据模型相似理论,以典型的高速铁路圆端形桥墩为原型,墩高取8 m、16 m 2种,设计了4个桥墩模型,分别在纵桥与横桥方向进行了单向低周反复荷载试验,得到两方向的滞回曲线、骨架曲线以及桥墩破坏形态.试验结果表明,横桥向剪跨比为1.35的模型,表现出了剪切破坏模式,延性较差;而横桥向剪跨比为2.13的模型,墩底出现了少量的弯剪裂缝,但其破坏模式仍为弯曲破坏.顺桥向桥墩模型的破坏模式均为弯曲破坏,与已有试验结果相同.当进行高速铁路低剪跨比桥墩的抗震设计时,应保证地震作用下的桥墩横桥抗剪承载力以避免发生剪切破坏.
Short bridge piers are widely used in high-speed railway. These piers have less reinforcement ratio and lower shear-span ratio than bridge piers for conventional high way. Furthermore, their section sizes in longitudinal and transverse directions are quite different. To compare the seismic performance of bridge pier between the longitudinal and transverse directions, 4 pier models were designed based on the model similarity theory. The prototypes of pier models were determined from the typical piers with ended rectangular cross-sections in high-speed railway, and the height of piers were 8 m and 16 m. After low cyclic tests were carried out in the longitudinal and transverse directions, the seismic performance of piers in these two directions, including the hysteretic curves, skeleton curves and failure modes,was obtained. The test results showed that the model with a shear span ratio of 1.35 failed due to typical shear failure, and the ductility was poor. When the shear span ratio of pier in the transverse bridge is 2.13, a few bending-shear cracks appear at the bottom of the pier, but the pier still fails in bending. The failure modes of pier in the longitudinal bridge are all bending failure, which as the same to the existing test results. When the seismic design of bridge pier with lower shear span ratio is carried, the shear capacity of the transverse pier under earthquake loading should be guaranteed to avoid the shear failure.
作者
邵光强
黄林胜
蒋丽忠
康俊涛
SHAO Guangqiang;HUANG Linsheng;JIANG Lizhong;KANG Juntao(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第7期65-75,共11页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51778630)
中国铁路总公司重大课题(2013G002A1)
中央高校基本科研业务费专项资金资助项目(WUT:2017IVA027)~~
关键词
高速铁路桥墩
低剪跨比
低周反复试验
抗震性能
破坏模式
bridge pier in high-speed railway
low shear span ratio
low cyclic test
seismic performance
failure mode
