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(1 浙江大學(xué)建筑設(shè)計(jì)研究院有限公司， 杭州 310028； 2 浙江大學(xué)土木工程學(xué)系， 杭州 310058；3 嘉興欣創(chuàng)混凝土制品有限公司， 嘉興 314109)

［摘要］為了解決混凝土預(yù)制樁現(xiàn)場(chǎng)拼接工作量大、施工不便等問(wèn)題，創(chuàng)新性地研發(fā)了一種彈卡式連接預(yù)應(yīng)力混凝土方樁連接接頭。通過(guò)對(duì)3種常用實(shí)心方樁接頭試件進(jìn)行受彎性能足尺試驗(yàn)，研究該方樁接頭的受彎承載力、變形延性以及破壞特征。結(jié)果表明：彈卡式連接預(yù)應(yīng)力混凝土方樁接頭試件的開(kāi)裂彎矩、極限彎矩試驗(yàn)值均大于其樁身開(kāi)裂彎矩、極限彎矩規(guī)范公式計(jì)算值；方樁接頭試件的受彎破壞形式均為連接接頭底部被拉開(kāi)，彈卡連接件附近預(yù)應(yīng)力鋼棒或墩頭被拉斷；建立的數(shù)值模型可以較好地模擬方樁接頭試件從加載到破壞的全過(guò)程，模擬得到的極限彎矩和跨中撓度與試驗(yàn)結(jié)果相接近。

［關(guān)鍵詞］方樁； 連接接頭； 彈卡式連接； 受彎性能； 預(yù)應(yīng)力

中圖分類號(hào)：TU473文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*浙江省重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2018C03033-1），國(guó)家自然科學(xué)基金項(xiàng)目（51779223）。

通訊作者：龔順風(fēng)，博士，教授，Email: sfgong@ zju.edu.cn。