桩间距对桩板结构应力变形的影响研究  

On Influence of Pile Spacing on Stress and Deformation of Pile Plate Structure

作　　者：张邹羿 ZHANG Zouyi(CCECC Fuzhou Survey&Design Institute Co.,Ltd.,Fuzhou 350000,China)

机构地区：[1]中土集团福州勘察设计研究院有限公司,福州350000

出　　处：《路基工程》2024年第3期89-94,共6页Subgrade Engineering

基　　金：中国铁建股份有限公司科技研发计划项目(13-C01)。

摘　　要：依托改建铁路漳泉肖线白濑水利枢纽工程影响区段改线工程项目,基于SAP2000软件,研究下穿桥梁地段铁路桩板结构的桩间距(等量桩径d)对板内正、负弯矩和变形的影响,并与规范进行比较。结果表明:横向桩间距不变时,随着纵向桩间距的增加,板内正、负弯矩及桩顶竖向变形均线性增加,板内最大负弯矩出现在板中央桩顶处;板内最大正弯矩逐渐由横向桩间向纵向桩间转移;当纵向桩间距为4d~5d时,板内各点处正、负弯矩和竖向变形均相对较小且大致相当,证明规范中桩间距规定的合理性;当纵向桩间距超过9d时,板内底部正弯矩较大,需进行配筋设计。Relying on the rerouting project of the section affected by the Bailai Water Conservancy Project on the re-built Zhangping-Quanzhou-Xiaocuo Railway,the impact of pile spacing(equivalent pile diameter d)on the positive and negative bending moments and deformations in the railway pile plate structure of underpass bridges was studied using SAP2000 software and compared with specifications.The results showed that when the transverse pile spacing remains unchanged,as the longitudinal pile spacing increases,the positive and negative bending moments in the plate and the vertical deformation of the pile top increase linearly,and the maximum negative bending moment in the plate appears at the pile top in the center of the plate.The maximum positive bending moment in the plate gradually shifts from the transverse piles to the longitudinal piles.When the longitudinal pile spacing is between 4d and 5d,the positive and negative bending moments at each point in the plate and the vertical deformation at each node are relatively small and roughly equivalent,proving the rationality of the pile spacing provisions in the specifications.When the longitudinal pile spacing exceeds 9d,the positive bending moment at the bottom of the plate is larger,and reinforcement design is required.

关 键 词：铁路下穿公路 桩板结构 桩间距 桩板弯距 变形 

分 类 号：U414[交通运输工程—道路与铁道工程]