- 摘 要
-
（1 金陵科技學(xué)院， 南京 211169； 2 江蘇鴻基節(jié)能新技術(shù)股份有限公司， 南京 210019；3 東南大學(xué)土木工程學(xué)院， 南京 210096）
［摘要］在全截面加筋方案基礎(chǔ)上提出了一種局部加強型管樁設(shè)計方案，并開展了局部加強型預(yù)應(yīng)力管樁抗彎試驗，建立了局部加強型預(yù)應(yīng)力管樁的初始抗彎剛度和剛度折減系數(shù)、抗裂彎矩和抗彎承載力計算模型。結(jié)果表明：對預(yù)應(yīng)力管樁進行局部加強能夠顯著提高標(biāo)準(zhǔn)管樁的抗彎性能；建立的局部加強型預(yù)應(yīng)力管樁初始抗彎剛度、抗裂彎矩和抗彎承載力設(shè)計公式的計算結(jié)果與試驗結(jié)果符合良好，能夠直接用于設(shè)計計算；建議局部加強型預(yù)應(yīng)力管樁的剛度折減系數(shù)取0-28；鑒于局部加強型預(yù)應(yīng)力管樁抗彎承載力大，可擴大其在深基坑支護工程中的應(yīng)用范圍。
［關(guān)鍵詞］局部加強型預(yù)應(yīng)力管樁； 抗彎承載力； 抗裂彎矩； 抗彎剛度； 剛度折減系數(shù)
中圖分類號：TU473文獻標(biāo)識碼：A文章編號：1002-848X(2017)09-0080-05
Investigation on bending experiment and design calculation method for locally reinforced PHC pipe pile
Song Yongsheng1, Tao Wencheng2, Yang Bo2, Wei Longwu2, Guo Tong3, Wei Hai2
(1 Jinling Institute of Technology, Nanjing 211169, China; 2 Jiangsu Hongji Energy-saving New Technology Company, Nanjing 210096， China; 3 School of Civil Engineering, Southeast University, Nanjing 210096， China)
Abstract:On the basis of a full-section strengthening project, the design scheme of locally reinforced PHC pipe pile was proposed. Bending experiment was carried out for the locally reinforced PHC pipe pile, and calculation models of the initial bending stiffness and stiffness reduction factor, crack bending moment and bending bearing capacity of locally reinforced PHC pipe pile were established. Results show that the local strengthening of the PHC pipe piles can significantly improve the bending behavior of the standard pipe piles. Calculation results design formulas of initial bending stiffness, crack bending moment and bending design capacity of locally reinforced PHC pipe pile are in good agreement with the test results, and the formulas can be used for design calculations. It is suggested that the stiffness reduction coefficient of the locally reinforced PHC pipe pile is 0-28. In view of the large bending bearing capacity of the locally reinforced PHC pipe pile, its application can be expanded in deep foundation pit support engineering.
Keywords:locally reinforced PHC pipe pile; bending bearing capacity; cracking moment; bending stiffness; stiffness reduction factor
*住房與城鄉(xiāng)建設(shè)部科技項目計劃（2013-S2-1），南京市城市建設(shè)投資控股（集團）有限責(zé)任公司科研項目，金陵科技學(xué)院高層次人才工作啟動費資助項目（jit-b-201614）。
作者簡介：宋永生，博士，講師，Email：songys@jit.edu.cn。
