PHC管樁樁身抗剪承載力試驗(yàn)與計(jì)算方法研究*
吳江斌,樓志軍,宋青君
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吳江斌,樓志軍,宋青君(華東建筑設(shè)計(jì)研究院有限公司,上海 200002)[摘要]開展了PHC-AB 400(80)型管樁在無軸壓及1 300kN軸壓作用下的抗剪承載力試驗(yàn),分別得到了管樁在純剪與壓剪作用下的極限抗剪承載力,同時(shí)對(duì)管樁的剪切破壞形態(tài)有了更清晰的認(rèn)識(shí)。針對(duì)管樁螺旋箍筋的受力特點(diǎn),推導(dǎo)了箍筋的抗剪承載力計(jì)算表達(dá)式,得到了綜合反映預(yù)應(yīng)力管樁混凝土環(huán)形截面和螺旋箍筋對(duì)抗剪承載力貢獻(xiàn)的管樁抗剪承載力計(jì)算公式?;谠囼?yàn)得到的極限承載力對(duì)多種計(jì)算公式進(jìn)行了比較,驗(yàn)證了本文計(jì)算公式的合理性,該公式可用于預(yù)應(yīng)力管樁、非預(yù)應(yīng)力管樁的純剪和壓剪承載力計(jì)算。[關(guān)鍵詞]PHC管樁;抗剪承載力;計(jì)算方法中圖分類號(hào):TU473-1文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002-848X(2012)05-0164-04Test and calculation method research on the shear capacity of PHC pipe pilesWu Jiangbin, Lou Zhijun, Song Qingjun(East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China)Abstract: Test on the shear capacity of PHC pipe piles under axial compressive 0, 1 300kN was carried out. The ultimate shear capacity of PHC-AB 400(80) pipe pile was obtained while the piles were in the state of pure shear and pressure shear, and the shear failure forms of piles were understood more clearly. The formula of shear capacity of spiral reinforcement was proposed, and a new method to calculate the shear capacity of PHC pipe piles was put forward,which reflected both the ring section of concrete and the mechanical characteristics of spiral reinforcement. Compared with other methods, the new method can fit better to the test values, which proves that the new method is reasonable. The new formula can be used to calculate the shear capacity of PHC pipe piles and non-prestressed pile, when the piles are in the state of pure shear or pressure shear.Keywords: PHC pipe pile; shear capacity; calculation method參考文獻(xiàn)[1]呂志濤,石平府,周燕勤,等.圓形、環(huán)形截面鋼筋混凝土構(gòu)件抗剪承載力的試驗(yàn)研究[J].建筑結(jié)構(gòu)學(xué)報(bào),1995,16(3):13-20.[2]宋寅. 預(yù)應(yīng)力混凝土管樁填芯混凝土抗剪試驗(yàn)[D]. 合肥: 合肥工業(yè)大學(xué),2006.[3]張忠苗, 劉俊偉, 鄒健,等. 加強(qiáng)型預(yù)應(yīng)力混凝土管樁抗彎剪性能試驗(yàn)研究[J]. 浙江大學(xué)學(xué)報(bào):工學(xué)版, 2011, 45(6): 1074-1080.[4]柳炳康, 李建宏, 張星宇,等. 預(yù)應(yīng)力填芯管樁抗彎性能與延性特征的試驗(yàn)[J]. 工業(yè)建筑, 2007, 37(3): 46-50.[5]劉永超, 鄭剛, 康谷貽,等. 預(yù)應(yīng)力混凝土管樁斜截面抗剪承載力試驗(yàn)研究[J].建筑結(jié)構(gòu), 2011, 41(5):93-97.[6]劉俊偉,張忠苗,于秀霞,等. 預(yù)應(yīng)力混凝土管樁抗彎及抗剪性能試驗(yàn)研究[J].建筑技術(shù), 2010, 41(12):1101-1104.[7]10SG409預(yù)應(yīng)力混凝土管樁圖集[S]. 北京:中國建筑標(biāo)準(zhǔn)設(shè)計(jì)研究院,2010.[8]DBJT 08.92—2000先張法預(yù)應(yīng)力混凝土管樁圖集[S].上海:上海市建設(shè)和管理委員會(huì),2000.[9]GB 50010—2010混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范[S]. 北京:中國建筑工業(yè)出版社, 2010.
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