沿海軟土液化地基PHC管樁的抗震設計
許國平
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(福建省建筑科學研究院，福州350025)［摘要］探討了沿海軟土液化地基PHC管樁的抗震設計。結合樁基工程震害實例，依據(jù)樁基抗震設計原則，研究PHC管樁受地震作用的表現(xiàn)性狀。認為PHC管樁的抗震承載力驗算應采用較高的m值和土層阻力參數(shù)，對樁身內力計算時應考慮在軸力作用下的綜合抗彎能力。提出PHC管樁的抗震設防建議，如增加螺旋箍筋、填實空芯、加強樁頭與承臺的連接。［關鍵詞］PHC管樁；樁基震害；內力計算；抗震設防中圖分類號：TU471.8文獻標識碼：A文章編號：1002-848X(2011)02-0116-04Seismic design for PHC pipe piles in coastal liquefaction soft sub-soilXu Guoping(Fujian Institute of Building Research, Fuzhou 350025, China)Abstract:Seismic design for PHC pipe piles in coastal liquefaction soft sub-soil was discussed. Combining with some seismic damage examples and according to the principles of seismic design of pile foundation, the behavior of PHC pipe piles under earthquake action was analyzed. The results show that higher m value and soil resistance parameters should be adopted in seismic capacity calculation of PHC pipe piles, and comprehensive flexural capacity under axial force should be considered in internal force calculation. The recommendation for seismic fortification design of PHC pipe piles was also proposed.Keywords:PHC pipe pile; seismic damage of pile; internal force calculation; seismic fortification design作者簡介：許國平，碩士，高級工程師，一級注冊結構工程師，注冊巖土工程師，Email：XGP668@126.com。參考文獻［1］劉惠珊. 樁基震害及原因分析［J］.工程抗震，1999(1)：37-43.［2］GB50011—2001建筑抗震設計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2001.［3］JGJ94—2008建筑樁基技術規(guī)范［S］.北京：中國建筑工業(yè)出版社，2008.［4］許國平.預應力管樁的水平承載力性狀分析［J］.福建建設科技，2005(3)：6-7,23.［5］許國平.靜壓PHC樁的荷載傳遞試驗研究［J］.建筑結構，2005，35(7):32-36.［6］GB50010—2002混凝土結構設計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2002.
