预应力管桩承载力分析
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###办公楼
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钻孔
ZK12
一、竖向承载力特征值R
(1)竖向承载力特征值(桩基桩数不超过3根)
单桩承载力特征值R = Qs + Qp = μΣqsiLi+ qpAp
桩长L=6
m 桩径d =400mm 桩重W p '=桩截面面积A p =0.091m 2壁厚t =95mm 惯性矩 I =
桩表面积A s =1.257m 2/m 桩顶标高=2.10m 混凝土強度等级=
地面标高=0.00m 桩顶深度=2.60m 地下水深度=1.5
m
桩底深度=8.60
m
二、抗拔力特徵值R t
R t = l f sk A s / K + W p '建筑物名称:设计规范:采用《建筑地基基础设计规范》(GB 50007-2002)及行业标准《建筑桩基技术规范》(JGJ 94-2008)
2-1淤泥质土 1.100.000.0000.0
3中砂 5.10 4.00 2.5018
0.74粗砂11.73 6.63 3.50320.75
砾砂
11.730.000.00
00.05-1粗砂
11.73
0.000.000
0.011.73
6.00
Q s =W p ' =
單樁抗拔力特徵值R t =146KN
三、单桩水平承载力特征值R h
0.4m 3.00E+07KN/m 2
6000KN/m 40.99
m
2.61E+04KN-m 20.9402.441
單樁水平承載力特徵值R 五、總結
樁頂容許水平位移c o a (地震)=樁身計算寬度 b o =
樁入土深度h =
樁的換算埋深 a h =查JGJ94-94 表5.4.2
樁頂水平位移係數n x (固接)=樁頂水平位移係數n x (鉸接)=
樁身抗彎剛度EI= 0.75E c I =樁直徑d =
水平變形係數 a =
混凝土彈性模量 E c =
樁頂容許水平位移c o a (常時)=
水平抗力係數之比例係數 m =a r i n g Pile Length,m Fig.10.1 Relationship Between Pile Allowable Bearing Cap Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80a p a c Pile Length,m Fig.10.2 Relationship Between Uplift Resistance And Leng
Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80Fig.10.3 Relationship Between Displacement and Moment for Late Remark ：1.* Material strength followed CNS-2602 of B type(fc'=800 kg/cm a r i n g Pile Length,m Fig.10.1 Relationship Between Pile Allowable Bearing Cap Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80a p
a c Pile Length,m Fig.10.2 Relationship Between Uplift Resistance And Leng
Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80Fig.10.3 Relationship Between Displacement and Moment for Late Remark ：1.* Material strength followed CNS-2602 of B type(fc'=800 kg/cm a r i n g Pile Length,m Fig.10.1 Relationship Between Pile Allowable Bearing Cap Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80a p
a c Pile Length,m Fig.10.2 Relationship Between Uplift Resistance And Leng Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80Fig.10.3 Relationship Between Displacement and Moment for Late Remark ：1.* Material strength followed CNS-2602 of B type(fc'=800 kg/cm 5
EI
mb o
=
a a
X h EI
R 03c n a =
a r i n g Pile Length,m Fig.10.1 Relationship Between Pile Allowable Bearing Cap Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80a p a c
Pile Length,m Fig.10.2 Relationship Between Uplift Resistance And Leng
Remark ：1.* Material strength followed CNS-2602 of B type(fc'=80Fig.10.3 Relationship Between Displacement and Moment for Late
Remark ：1.* Material strength followed CNS-2602 of B type(fc'=800 kg/cm 5
EI
mb o
=
a a
X
h EI
R 03c n a =