预制根植桩高强螺栓连接受弯性能数值模拟  

Numerical simulation of flexural performance of high-strength bolted connections in precast nodular piles

作　　者：杜钦勇 王忠瑾 张日红 王浩 谢新宇[1,5] DU Qinyong;WANG Zhongjin;ZHANG Rihong;WANG Hao;XIE Xinyu(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;School of Civil Engineering,NingboTech University,Ningbo 315100,Zhejiang,China;ZCONE High-Tech Pile Industry Holdings Co.,Ltd.,Ningbo 315145,Zhejiang,China;Quzhou Traffic Design Co.,Ltd.,Quzhou 324003,Zhejiang,China;Institute of Wenzhou,Zhejiang University,Wenzhou 325035,Zhejiang,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙大宁波理工学院土木建筑工程学院,浙江宁波315100 [3]中淳高科桩业股份有限公司,浙江宁波315145 [4]衢州市交通设计有限公司,浙江衢州324003 [5]浙江大学温州研究院,浙江温州325035

出　　处：《地基处理》2025年第2期127-137,共11页Journal of Ground Improvement

基　　金：宁波市重大科技攻关暨揭榜挂帅项目(2022Z030);宁波市青年科技创新领军人才项目(2023QL018);衢州市科技计划项目(2022K17);浙江省建设科研项目(2022K113)。

摘　　要：为探究新型预制根植桩高强螺栓连接的抗弯性能,对不同桩径的预制根植桩连接试件抗弯试验过程进行了三维数值模拟,分析了该连接方式在抗弯试验过程中的承载能力、抗裂性能以及局部构件的应力、变形发展情况。结果表明:不同桩径下,高强螺栓接头的极限弯矩与桩身极限弯矩标准值的比值均大于1,满足连接件的弯矩承载要求;端板是整个试件中受荷屈服最严重的构件,以桩径为400 mm的连接试件为例,螺栓孔周部分在位移荷载为5.1 mm时进入了屈服状态,端板受拉区顶部在极限破坏时的轴向变形量为2.46 mm;螺栓在接头受弯过程中受拉力和弯矩的共同作用,其靠近端板内径的一侧受拉且部分区域达到屈服;桩身受拉区拉裂裂缝随加载过程逐步发展,受压区混凝土在达到极限破坏时产生压碎破坏,接头破坏形式为良性破坏。通过对该连接接头受弯过程的模拟,有助于后续对该连接方式进行改进与优化,为实际应用夯实基础。The purpose of this paper is to investigate the flexural performance of a novel precast nodular pile connection with high-strength bolts.Through conducting three-dimensional numerical simulations of flexural tests on connection specimens with various pile diameters,an analysis was performed to assess the load-bearing capacity,crack resistance,the stress and deformation evolution of the local components during the flexural tests.The results show that for different pile diameters,the ratio of the ultimate bending moment of the high-strength bolted joint to the ultimate bending moment standard value of the pile body exceeds 1,which meets the bending moment bearing requirements of the connection.The end plate is the most severely yielded component in the entire specimen.Taking the 400 mm pile diameter connection specimen as an example,a portion of the area around the bolt hole reaches a yield state at a displacement load of 5.1 mm,and the axial deformation at the top of the tension zone of the end plate at ultimate failure is 2.46 mm.The bolt experiences both tension and bending moments.The side closer to the inner diameter of the end plate undergoes tension,and partial regions reach a yield state.The tensile cracks in the tensile zone of the pile body develop gradually during loading,and the concrete in the compression zone produces crushing damage when it reaches the ultimate failure,and the failure mode of the joint is a ductile failure.The simulation of the bending process of this joint helps to improve and optimize the connection method for practical application.

关 键 词：预制根植桩 预制桩连接 连接接头 ABAQUS数值模拟 受弯性能 

分 类 号：TU473[建筑科学—结构工程]