(1 浙江大学建筑设计研究院有限公司， 杭州 310028； 2 浙江大学土木工程学系， 杭州 310058；3 嘉兴欣创混凝土制品有限公司， 嘉兴 314109)

［摘要］为了解决混凝土预制桩现场拼接工作量大、施工不便等问题，创新性地研发了一种弹卡式连接预应力混凝土方桩连接接头。通过对3种常用实心方桩接头试件进行受弯性能足尺试验，研究该方桩接头的受弯承载力、变形延性以及破坏特征。结果表明：弹卡式连接预应力混凝土方桩接头试件的开裂弯矩、极限弯矩试验值均大于其桩身开裂弯矩、极限弯矩规范公式计算值；方桩接头试件的受弯破坏形式均为连接接头底部被拉开，弹卡连接件附近预应力钢棒或墩头被拉断；建立的数值模型可以较好地模拟方桩接头试件从加载到破坏的全过程，模拟得到的极限弯矩和跨中挠度与试验结果相接近。

［关键词］方桩； 连接接头； 弹卡式连接； 受弯性能； 预应力

中图分类号：TU473文献标识码：A文章编号：1002-848X(2020)13-0121-07

Study on flexural behavior of prestressed concrete square pile connection joint with resilient clamping

ZHOU Jiawei1, WANG Yunfei2, GONG Shunfeng2, ZHANG Aihui2, LIU Chengbin2, FAN Hua3

(1 The Architectural Design & Research Institute of Zhejiang University Co., Ltd., Hangzhou 310028, China;2 Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China;3 Jiaxing Xinchuang Concrete Products Co., Ltd., Jiaxing 314109, China)

Abstract:In order to solve the problems of large workload and inconvenient construction of on-site splicing of precast concrete piles, a type of new   prestressed concrete square piles connection joint with resilient clamping was developed. The full-scale flexural performance experiments of three kinds of commonly-used solid square pile connection joint specimens were carried out to investigate the flexural bearing capacity, deformation ductility and failure characteristics of the square pile connection joints. The results show that the experimental values of the cracking and ultimate bending moments of the prestressed concrete square pile connection joint specimens are larger than the calculated values of the cracking and ultimate bending moments of the pile body from the code formula. The flexural failure mode of the square pile connection joint specimens is that the bottom of the connection joint is pulled away, and the prestressed steel bar or pier head near resilient clamping connectors is broken. The established numerical model can well simulate the whole process of the square pile connection joint specimens from the loading to the failure, and the simulated ultimate bending moment and mid-span deflection are comparatively close to the experiment results.

Keywords:square pile; connection joint; resilient clamping connection; flexural behavior; prestress

*浙江省重点研发计划项目（2018C03033-1），国家自然科学基金项目（51779223）。

通讯作者：龚顺风，博士，教授，Email: sfgong@ zju.edu.cn。