组合节点形式群桩基础水平承载特性分析  

Horizontal Bearing Characteristics of Pile Group Foundation with Composite Pile-Cap Connection

作　　者：许春博 郭昭胜[1,2] 贺武斌[1,2] 刘瑞峰[1,2] XU Chunbo;GUO Zhaosheng;HE Wubin;LIU Ruifeng(College of Civil Engineering,Taiyuan University of Technology,Taiyuan Shanxi,China;Shanxi Key Laboratory of Civil Engineering Disaster Prevention and Control,Taiyuan University of Technology,Taiyuan Shanxi,China)

机构地区：[1]太原理工大学土木工程学院,山西太原 [2]太原理工大学土木工程防灾与控制山西省重点实验室,山西太原

出　　处：《太原理工大学学报》2025年第2期246-256,共11页Journal of Taiyuan University of Technology

摘　　要：【目的】对不同节点刚度形式的两类群桩(1×3普通节点群桩、1×2劲性节点群桩)进行研究。【方法】现场试验得到节点刚度与桩数对水平承载性能的影响,在此基础上,利用有限元方法研究节点刚度对其承载性能的影响,并采用不同节点形式组合群桩,研究其承载性能及荷载分配机制。【结果】结果表明:采用1×2劲性节点群桩可提高基桩平均水平极限承载力约17.63%,并改善水平位移减小41.64%;增设T形钢件后,其竖向变形能力可提高54.22%,且可改善节点转动;对于前排承压桩,可取消其锚固钢筋,采用更大的嵌固深度;采用组合节点形式群桩,其整体水平刚度可提高13.07%,同时改善其竖向变形能力,有利于加载后期水平荷载的均匀分配;基桩节点刚度应由该桩与邻桩节点刚度共同确定。【Purposes】Two types of pile group with different pile-cap connection forms(1×3 pile group with ordinary connection and 1×2 pile group with rigid connection)are tested in the field to obtain and the influences of connection stiffness and the number of piles on their horizontal bearing capacities.【Methods】On this basis,the finite element method was used to study the influence of connection stiffness on its bearing capacity.Besides,the composite connection pile groups with different connection forms were used to study their bearing capacities and load distribution mechanism.【Findings】The results show that the average ultimate bearing capacity of foundation piles can be increased by about 17.63%and the horizontal displacement can be reduced by 41.64%by using 1×2 rigid connection group piles.After adding T-shaped steel members,the vertical deformation capacity can be increased by up to 54.22%,and the connection rotation can be improved.For the front bearing pile,the anchoring steel bar can be cancelled and a larger embedded depth can be selected.The overall horizontal stiffness of the pile group with composite connections can be increased by up to 13.07%,and its vertical deformation capacity can be improved at the some time,which is conducive to the uniform distribution of horizontal load in the later stage of loading.The connection stiffness of pile should be determined by the connection stiffnesses of both the pile and its adjacent pile.

关 键 词：低承台群桩 桩-承台节点刚度 水平荷载 有限元分析 内力分布 

分 类 号：TU473[建筑科学—结构工程]