管桩水平承载力计算

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,,,混凝土强度和模量,,,,,,

基本资料,,,强度,fck,ftk,fc,ft,Ec,Ecf

,,,类型,N/mm2,N/mm2,N/mm2,N/mm2,N/mm2,N/mm2

,,,C15,10,1.27,7.2,0.91,22000,

,,,C20,13.4,1.54,9.6,1.1,25500,11000

,,,C25,16.7,1.78,11.9,1.27,28000,12000

,,,C30,20.1,2.01,14.3,1.43,30000,13000

,,,C35,23.4,2.2,16.7,1.57,31500,14000

,,,C40,26.8,2.39,19.1,1.71,32500,15000

,,,C45,29.6,2.51,21.1,1.8,33500,15500

,,,C50,32.4,2.64,23.1,1.89,34500,16000

,,,C55,35.5,2.74,25.3,1.96,35500,16500

单桩水平承载力设计值计算,,,C60,38.5,2.85,27.5,2.04,36000,17000

,,,C65,41.5,2.93,29.7,2.09,36500,17500

,,,C70,44.5,2.99,31.8,2.14,37000,18000

,,,C75,47.4,3.05,33.8,2.18,37500,18500

,,,C80,50.2,3.11,35.9,2.22,38000,19000

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,,,钢筋强度和模量,,,,,,

,,,强度,直径,fyk,fy,fy',Es,

,,,类型,,N/mm2,N/mm2,N/mm2,N/mm2,

,,,HPB235,8~20,235,210,210,210000,

,,,HRB335,6~50,335,300,300,200000,

,,,HRB400,6~50,400,360,360,200000,

,,,RRB400,8~40,400,360,360,200000,

,,,消除应力钢丝,,,,,205000,

,,,钢绞线,,,,,195000,

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基本资料,,,,,,,,,

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单桩水平承载力设计值计算,,,,,,,,,

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,,,单桩水平承载力特征值Rha,500径+100厚,,,,,

,桩类型：钢筋混凝土预制管桩PHC,,桩顶约束情况：,铰接、自由,,,,,

,桩身直径d,,d=,500,mm,,,,

基本资料,桩身壁厚C,,C=,100,mm,,,,

,混凝土强度等级,,,C80,,,,,

,混凝土弹性模量Ec,,Ec＝,38000,N/mm2,,,,

,桩身纵筋As,,As＝,700,mm2,,,,

,净保护层厚度c,,c=,45,mm,,,,

,钢筋弹性模量Es,,Es＝,195000,N/mm2,,,,

,桩入土深度,,h＝,40,m,,,,

,桩侧土水平抗力系数的比例系数m,,(查表5.7.5)m＝,3.5,MN/m4,,,,

,桩顶容许水平位移χoa,,χoa=,10,mm,,,,

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单桩水平承载力设计值计算,(1)、桩身面积Ac,,Ac=π[d2-(d-2C)2]/4=,125660,mm2,,,,13f10.7

,(2)、桩身配筋率ρg,,ρg=As/Ac＝,0.0056,,,,,

,(3)、桩身抗弯刚度EI：,,,,,,,,

,扣除保护层的桩直径do,,do＝d-2c＝,410,mm,,,,

,钢筋弹性模量与混凝土弹性模量的比值αE,,αE=Es/Ec=,5.13,,,,,

,桩身全截面换算截面惯性距I2=,,πd2[d2+2(αE-1)ρgdo2]/64=,0.00316,m4,,,,

,桩空心部分截面惯性距I1,,I1=π(d-2C)4/64=,0.00040,m4,,,,

,桩身换算截面惯性距Io,,Io=I2-I1=,0.00277,m4,,,,

,钢筋混凝土桩EI,,EI＝0.85EcIo=,89319.5,m4,,,,

,(4)、桩的水平变形系数α按下式确定：(桩基5.7.5),,,,,,,,

,对于圆形桩，当直径d≤1m时，,,bo＝0.9(1.5d+0.5)=,1.13,m,,,,

,桩的水平变形系数α,,α＝(m*bo/EI)1/5=,0.5356,,,,,

,(5)、桩顶水平位移系数νx：（查表规范5.7.2）,,,,,,,,

,桩的换算埋深,,αh=α*h=,21.42,m,,,,

,桩顶水平位移系数νx：（查表5.7.2）,,νx＝,2.441,,,,,

,(6)、单桩水平承载力特征值,,Rha＝0.75α3EIχoa/νx=,42,KN,,,,

,验算综合仓库桩基水平承载力：,,,,,,,,

,Hky=57/2=28.5kN﹤Rha=42kN,,,,,,,,

,根据桩规5.7.1，桩基水平承载力满足要求。,,,,,,,,

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