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（1 浙江大學(xué)結(jié)構(gòu)工程研究所， 杭州 310058； 2 浙江大學(xué)建筑設(shè)計(jì)研究院有限公司， 杭州 310028）

［摘要］研發(fā)了復(fù)合配筋混凝土預(yù)制方樁，通過對(duì)3種常用樁型方樁試件的足尺軸向抗壓性能試驗(yàn)和數(shù)值模擬分析，研究復(fù)合配筋混凝土預(yù)制方樁的裂縫分布、軸壓承載力及破壞特征。結(jié)果表明：方樁試件存在兩種破壞模式，一種為局部破壞，鋼筋未壓曲，樁端混凝土發(fā)生劈裂破壞；另一種為全截面破壞，縱筋向外壓曲，箍筋拉斷，混凝土壓碎而破壞。數(shù)值模擬得到的樁身極限抗壓承載力與全截面破壞試件的試驗(yàn)結(jié)果吻合較好，相差在10%以內(nèi)，比局部破壞試件的試驗(yàn)結(jié)果大約25%。當(dāng)前設(shè)計(jì)規(guī)范中樁身極限抗壓承載力經(jīng)驗(yàn)公式計(jì)算結(jié)果相互間差異較大，《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》(GB 50010—2010)的經(jīng)驗(yàn)公式計(jì)算值與數(shù)值模擬結(jié)果較為接近，且具有一定的安全余度。

［關(guān)鍵詞］復(fù)合配筋； 預(yù)制方樁； 軸向抗壓性能； 損傷塑性模型

中圖分類號(hào)：TU473-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)03-0102-06

Study on axial compression behavior of composite reinforcement concrete prefabricated square piles

Yang Fan1, Xu Quanbiao2, Chen Gang2, Gong Shunfeng1, Zeng Kai2, Liu Chengbin1

(1 Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China;2 The Architectural Design & Research Institute of Zhejiang University Co., Ltd., Hangzhou 310028, China)

Abstract:The composite reinforcement concrete prefabricated square piles were developed. Full-scale experiment and numerical simulation of axial compression behavior for square pile specimens in three kinds of commonly-used pile types were carried out to investigate the crack distribution, axial compressive bearing capacity and damage characteristic of composite reinforcement concrete prefabricated square piles. The results show that there are two types of failure modes for square pile specimens; one is the partial failure of cross-section, in which the longitudinal reinforcement is not buckled, and the concrete at the pile ends produces the splitting failure; the other is the full-section failure, in which the longitudinal reinforcement is buckled outward, the stirrup is fractured, and the concrete is crushed. The numerical results of the ultimate compressive bearing capacity are in good agreement with the experimental results for full-section failure specimens, and the difference between them is less than 10%. While the numerical results are approximately 25% more than the experimental results for the partial failure specimens. There are great differences among the calculation results of  empirical formulas  for  ultimate compressive bearing capacity of square piles in current design codes, while the calculated value of the empirical formula in the Code for design of concrete structures (GB 50010—2010) is comparatively close to the numerical result, and has enough safety margin.

Keywords:composite reinforcement; prefabricated square pile; axial compression behavior; damaged plasticity model