铁道科学与工程学报2025，Vol.22Issue(3)：1154-1164,11.DOI:10.19713/j.cnki.43-1423/u.T20240746
高配筋铁路重力式桥墩地震破坏模式及抗剪强度公式研究
Seismic failure mode and shear strength formula of high reinforced railway gravity piers
摘要
Abstract
To investigate the influence of shear span ratio on the failure mechanism and seismic performance of high reinforced railway gravity bridge piers,and explore the seismic failure mode discrimination method and shear strength calculation formula for railway gravity piers,a railway bridge on a near fault plateau in China was taken as engineering background sample,and five high reinforced gravity model piers with shear span ratios ranging from 1.4 to 3.2 were designed and manufactured.The failure mechanism and seismic performance of the piers were explored through transverse quasi-static tests.The existing methods for identifying seismic failure modes and calculating the shear strength of the piers were evaluated based on the test results.The results show that the shear span ratio significantly impacts the failure mode of high reinforced railway gravity bridge piers.Pier with a shear span ratio of 1.4 experienced shear failure,while those with a shear span ratio of 1.7～3.2 experienced flexural-shear failure.The failure phenomenon of high reinforced railway gravity bridge piers significantly differs from that of traditional low reinforced railway gravity bridge piers.The pinching effect of hysteresis curve intensifies with the decrease of the shear span ratio.The ductility of high reinforced railway gravity bridge piers with a shear span ratio of 1.4～3.2 is poor,with a displacement ductility coefficient between 1.5 and 2.7,which is significantly lower than the allowable displacement ductility ratio in current railway code.The Zhang Yongqiang method can accurately distinguish the seismic failure mode of railway gravity bridge piers.The formula within the plastic hinge zone in the"Specifications for Seismic Design of Highway Bridges"can be used for the shear strength calculation of railway shear-bending failure gravity bridge piers.The formula outside the plastic hinge zone in the revised draft of the"Code for Seismic Design of Urban Bridges"can be used for the shear strength calculation of shear failure bridge piers.The results can provide references for the seismic design of railway gravity bridge piers.关键词
铁路桥墩/剪跨比/拟静力试验/破坏模式/抗剪强度Key words
railway piers/shear span ratio/quasi-static test/seismic failure mode/shear strength分类
交通工程引用本文复制引用
杨钟仁,夏修身,钟亚伟,戴胜勇,王超,杨泽..高配筋铁路重力式桥墩地震破坏模式及抗剪强度公式研究[J].铁道科学与工程学报,2025,22(3):1154-1164,11.基金项目
国家自然科学基金资助项目(52068041,52278186) （52068041,52278186）
兰州交通大学重点研发项目(LZJTU-ZDYF2305) （LZJTU-ZDYF2305）
