场地类别对预制小箱梁桥抗震性能影响研究  

Research on Influence of Site Classification on Seismic Performance of Precast Small Box Beam Bridges

作　　者：刘贝 丁伟慧 LIU Bei;DING Weihui(Huashe Design Group Co.,Ltd.,Nanjing 210014,China)

机构地区：[1]华设设计集团股份有限公司,江苏南京210014

出　　处：《城市道桥与防洪》2025年第2期111-114,124,共5页Urban Roads Bridges & Flood Control

摘　　要：以30 m跨径预制小箱梁桥为研究对象,采用反应谱法分析VII度区(0.1g)不同场地类别、墩高为5~15 m、纵筋率为0.6%~2.1%的小箱梁桥在E1、E2地震作用下的桥梁抗震性能。研究结果表明:墩高、场地类别越高,墩柱纵筋率越低,E1、E2地震墩柱强度富裕越少;墩柱横桥向可按弹性构件设计,顺桥向可根据墩高、场地类别、配筋经济性采用弹性或延性构件设计;地震场地类别为IV类时,支座抗滑能力不足,宜采用减隔震设计;墩柱纵筋率越低、场地类别越高,墩顶位移越大;纵筋率越低,墩顶容许位移越大;矮墩宜按弹性构件设计,墩柱按照延性构件的桩与柱纵筋率的比值为1.21~1.92。相关结论供同类工程参考。Taking a 30 m-span precast small box beam bridge as the research object,the response spectrum method is used to analyze the seismic performance of small box beam bridges with different site classifications,pier heights of 5~15 m and longitudinal reinforcement ratio of 0.6%~2.1%under E1 and E2 earthquakes in the VII degree zone(0.1g).The research results indicate that the higher the pier height and site classification,the lower the longitudinal reinforcement ratio of the pier column,and the less abundant the strength of the pier column during E1 and E2 earthquakes.The transverse bridge direction of the pier column can be designed as elastic components,while the longitudinal direction can be designed as elastic or ductile components based on the pier height,site classification and reinforcement economy.When the seismic site type is class IV,the anti-sliding capacity of the bearing is insufficient,and the seismic isolation design can be used.The lower the longitudinal reinforcement ratio of pier column and the higher the classification of the site,the greater the displacement of the pier top.The lower the longitudinal reinforcement ratio,the larger the allowable displacement of the pier top.The low piers should be designed as elastic components.The pier columns are designed according to ductile components.The ratio of longitudinal reinforcement ratio of pile to column is 1.21~1.92.The relevant conclusions can be used as reference for similar projects.

关 键 词：抗震性能 场地类别 预制小箱梁 反应谱法 纵筋率 

分 类 号：U442[建筑科学—桥梁与隧道工程]