码头设计中桩基有效计算长度分析  

Analysis of effective calculation length for pile in jetty design

作　　者：王安华[1] 杨国平[1] WANG An-hua;YANG Guo-ping(CCCC Water Transportation Consultants Co.,Ltd.,Beijing 100007,China)

机构地区：[1]中交水运规划设计院有限公司,北京100007

出　　处：《水运工程》2021年第10期168-172,共5页Port & Waterway Engineering

摘　　要：有效计算长度是高桩码头桩基压屈验算的控制性参数。国内外规范提供了其理想约束下的计算方法,但不能完全反映顶部实际约束,也未明确整体分析时顶部约束类型。介绍利用有限元屈曲临界荷载确定桩基有效计算长度的方法,该方法反映实际约束较为精确,并提出码头桩基局部分析和整体分析的设计理念,得出相应规律。结果表明,局部桩基分析时,端部排架1~3顶部可认为铰接,其他排架顶部可认为固接;码头结构整体分析时,桩基顶部约束为平滑约束;码头结构整体分析时,排架≥2轴时桩基顶部可认为平滑约束;单排桩≥2根时顶部横向可认为平滑约束。实际码头工程中桩基布置、斜率等变化因素较多,可利用本文方法进行分析。The effective length of pile foundation is the main control parameter when checking the buckling capacity of pile for high pile beam jetty.The effective length calculation method of pile under ideal constraints is provided in Chinese and foreign codes,but it cannot fully reflect the actual constraints on jetty top,and the boundary type of wharf integral pile foundation analysis is not defined.We introduce the method to calculate pile effective length using buckling critical load by finite element method,which can reflect the accurate actual constraints.We propose the design idea of partial analysis and integral analysis of wharf pile,and obtain the corresponding law.The results show that for pile partial analysis,the top boundary of end pile bent 1~3 can be considered as articulated,and that of the other racks can be considered as fixed.For the integral analysis of wharf structure,the top boundary of the integral pile foundation is a smooth constraint.For the integral analysis of wharf structure,the top boundary of the overall pile foundation can be considered as smooth constraint when pile bent are all more than 2.The top transverse boundary can be considered as smooth constraint when single pile bent is with more than 2 piles.The pile arrangement,raking slope and so on are varietal in actual engineering.This method can be used for specific analysis.

关 键 词：桩基有效计算长度 高桩码头 顶部边界约束 有限元屈曲临界荷载 桩基局部分析 整体分析 

分 类 号：U656.113[交通运输工程—港口、海岸及近海工程]