2024年2月19日发(作者:司安然)
箱涵结构计算
一、设计资料
净跨径L0为4.5m,净高位2m,箱涵填土高H为0.7m,土的摩擦角为30,土的容重γ1=19KN/m³,设箱涵采用C20砼和HRB335钢筋。
二、设计计算
(一)截面尺寸拟定(见图1)
顶板、底板厚度
δ=40cm (C1=15cm)
侧墙厚度 t=36cm (C2=15cm)
故 Lp=L0+t=4.5+0.36=4.86m
hp=ho+δ=2.0+0.4=2.4m
(二)荷载计算
1.恒载
恒载竖向压力
P =γ1
H+γ2δ=19×0.7+25×0.4 = 23.2 KN/㎡
恒载水平压力
顶板处
ep2 1 (Hh)tg2(45302)=19×0.7×tg²30º
=4.43 KN/㎡
底板处:
e
p2 1 (Hh)tg2(45302)=19 ×(0.7+2.8)×tg²30
1
=22.16 KN/㎡
2.活载
公里-Ⅱ级车辆荷载由《公路桥涵设计通用规范》(JTG D60-2004)第4.3.4条计算
一个汽车后轮横向分布宽
>0.6 +0.7tg30°=0.704m
21.8 < m
2故,两列车相邻车轴有荷载重叠,应按如下计算横向分布宽度
0.6a=( +0.7tg30°)×2+1.3=2.708 m
2同理,纵向:
0.2 +0.7tg30°=0.504<1.4/2m
2故
0.2b=( + 0.7tg30°)×2=1.008m
2车辆荷载垂直压力
140q车= = 51.29 KN/㎡
2.708×1.008车辆荷载水平压力
e车=51.29tg²30°=17.10 KN/㎡
三、 内力计算
1 .构件刚度比
1.3 m
22
1ep1
I1I2
121Lp12h110.410.36222.44.860.677
2 .节点弯矩和轴向力计算
(1)α种荷载作用下(图2)
涵洞四角节和弯矩:
1PLp²MaA=MaB=MaC=MaD= - ·
K+112Na1=Na2=0
PLpNa3= Na4=
2恒载(p=P)
-123.3×4.86²MaA= · = -27.351 KN·m
0.677+11223.3×4.86Na3= = 56.62KN
2车辆荷载(p=q车)
-151.29×4.86²MaA= · = 60.56 KN·m
0.677+11251.29×4.86Na3= = 124.63KN
2(2)b种荷载作用下(图3)
KPhp²MaA=MaB=MaC=MaD= - ·
K+112PhpNb1=Nb2=
2Na3= Na4=0
3
恒载(p=eP1)
M0.6774.43×2.4²bA= -
0.677+1 ·12 =-0.858 KN·m
N4.43×2.4b1=
2 =5.316KN
(3)C种荷载作用下(图4)
M(3K8)2cAMcDK(K1)(K3)Php60
K(2K7)Php2McBMcC(K1)(K3)60
NcMcAMcB1Php6h
pNcPhpMcAMcB23h
p恒载(p=ep2-ep1=22.16-4.43=17.73 KN)
M8)17.732.42cAMcD0.677(30.677(0.6771)(0.6773)60
= -1.875 KN·m
M(20.6777)732.42cBMcC0.677(0.6771)(0.6773)17.60
= -1.561 KN·m
Nc.732.41.56111761.8752.46.96KN
Nc17.732.41.8751.561232.414.315KN
(4)d种荷载作用下(图5)
M3)K2p2dA[K(K6(K24K3)1015K5]Ph4
4
MdB[K(K3)6(K24K3)5K315K55K315K510K215K5]Php4Php4Php42
2MdC[K(K3)6(K24K3)]
2MdA[K(K3)6(K24K3)]
Nd1MdDMDChp
Nd2PhpMdDMDChp
Nd3Nd4MdBMdhpC车辆荷载(P=e车=17.10 KN/m²)
K(K3)6(K24K3)5K315K50.677(0.6773)6(0.677240.6773)50.6773150.67750.0673
10K215K55K315K5100.6772150.677550.6773150.67750.5797
0.4213
2MdA(0.06730.5297)17.102.4417.102.4415.932KNm
2MdB(0.06730.4213)8.717KNm
MdC(0.06730.4213)17.102.4417.102.44225.113KNm
2MdA(0.06730.5297)12.617KNm
Nd112.61725.1132.415.72KN
5
Nd217.102.415.7225.32KN
Nd3Nd48.71725.1134.866.96KN
(5)节点弯矩和和轴力计算汇总表
M (KN·m)
荷载种类
A B C D 1 2 3 4
N(KN)
-27.35 -27.35 -27.35 -27.35
5.316
-0.858 -0.858 -0.858 -0.858
6.96
恒载 -1.875 -1.561 -1.561 -1.875
=
= = = =
12.276
-30.083 -29.969 -29.769 -30.083
19.631
14.315 56.62 56.62
5.316
-60.56 -60.56 -60.56 -60.56
-15.932 8.717 -25.113 12.617
车辆车载
= = = =
15.72 25.32
124.63 124.63
-6.96
=
-6.96
=
-76.49 -51.843 -85.673 -47.943 117.67 117.67
(6)荷载效应组合。按《公路桥涵设计通用规范》((JTG D60-2004)第4.1.6条进行承载能力极限状态效应组合
Sud=1.2SGK+1.4SQK
MA=1.2×(-30.083)+1.4×(-76.49) =-143.186 KN·m
MB=1.2×(-29.769)+1.4×(-51.843)=-108.303 KN·m
Mc=1.2×(-29.769)+1.4×(-85.673)=-155.665 KN·m
MD=1.2×(-30.083)+1.4×(-47.943)=-103.220 KN·m
6
N1=1.2×12.276+1.4×15.72=36.739KN·m
N2=1.2×19.631+1.4×25.32=59.005KN·m
N3=1.2×56.62+1.4×117.67=232.682KN·m
3、构件内力计算(跨中截面内力)
(1)顶板(图6-1)
xlp2
P=1.2×23.3+1.4×51.29=99.766 KN
Nx=N1=36.739KN·m
MxMBN3xPx22108.303232.6824.86299.7664.8682
=162.557 KN·m
Vx=P·x-N3=99.766×4.86 -232.682=9.75 KN
2(2)底板(图6-2)
W1Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)
2 = 80.85KN/㎡
W2Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)
2= 115.88 KN/㎡
xlp24.8622.43
Nx=N3=232.682KN
MxMAN3xW1x22x36LP(W2W1)
7
143.186232.6822.4380.85166.29KNmVxW1xx22.43222.43364.86(115.8880.85)
2LP(W2W1)N3
280.852.4314.94KN2.4324.86(115.8880.85)232.682
(3)左侧墙(图7)
W1= ep1+ e车=1.2×4.43+1.4×17.10=29.26 KN/㎡
W2= ep2+ e车=1.2×22.16+1.4×17.10=50.53 KN/㎡
xhp21.2
Nx= N3= 232.682 KN
MxMBN1xW1x22x36LP(W2W1)
108.30336.7391.229.2658.44KNmVxW1xx21.2221.2362.4(50.5329.26)
2hP(W2W1)N1
229.261.24.75KN1.222.4(50.5329.26)36.739
(4)右侧墙 (图8)
xhp21.2
W1= ep1 =1.2×4.43=5.32 KN/㎡
W2= ep2 =1.2×22.16=26.59 KN/㎡
8
Nx= N4= 232.682 KN
MxMCN1xW1x22x36LP(W2W1)
155.65536.7391.25.32120.51KNmVxW1xx21.2221.2362.4(26.595.32)
2hP(W2W1)N1
25.321.223.97KN1.222.4(29.595.32)36.739
(5)构件内力汇总表
构件 Md Nd
B
B-C
-108.303 36.739 232.682 162.557 36.739
A
A-D
-143.186 59.005
B
B-A
-108.303 232.682 36.739 -58.44 59.005
C
C-D
-155.665 232.682 36.739 -120.51 36.739 -23.97 -99.69 225.39 -59.005
C-D
4.75 -143.186 232.682 -59.005
D
225.39 166.29 59.005 -14.94 -103.220 59.005 -232.682
A-C A
9.75 -155.665 36.739 -232.682
D
Vd Md Nd
B-C
Vd Md Nd
C
Vd
(四)截面设计
1.顶板(B-C)
钢筋按左、右对称,用最不利荷载计算
(1)跨中
9
l0=4.86m,h=0.4m,α=0.03m, h0=0.37m
e0MdNdbh122162.55736.7390.41224.425
i0.115
l0i4.860.11542.2617.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.74.4250.3732.49
21.150.011.150.014.860.41.03
1h01400e0(l0h)12
210.3714004.425(4.860.4)32.491.032
1.295
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.2954.4250.20.035.900
0Ndefcdbx(h0x2)
0.936.7391059009.21000x(3703x2)
解得x62.6mmbh00.56370207.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100062.60.936.7391028031938.76 mm²
用ø20@100mm,实际AS= 3142 mm²
10
100ASbh0100314210003700.8490.2
满足《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第9.1.12条的规定。
0.51103fcu,kbh00.51103201000370
843.9KN0Vd0.99.758.78KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000370
196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。
(2)结点
l0=4.86m,h=0.55m,α=0.03m, h0=0.52m
e0MdNdbh122155.66536.7390.551224.237m
i0.1588
l0i4.860.158830.6017.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h00.22.74.2370.5222.20
21.150.01l0h1.150.014.860.5521.056
1h01400e0(l0h)12
211
10.5214004.237(4.860.55)22.21.0562
1.161
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.1614.2370.2750.035.164m
0Ndefcdbx(h0x2)
0.936.7391051649.21000x(5203x2)
解得x37mmbh0291.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.21000370.936.7391028031097.62 mm²
100ASbh01001097.6210005200.2110.2
用ø20@100mm,实际AS= 3142 mm²
满足《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第9.1.12条的规定。
0.51103fcu,kbh00.51103201000520
1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000520
275.6KN0Vd202.85KN
抗剪配筋按构造设置。
2.底板(A-D)
钢筋按左、右对称,用最不利荷载计算
12
(1)跨中
l0=4.86m,h=0.4m,α=0.03m, h0=0.37m
e0MdNdbh122166.2959.0050.41222.818
i0.115
l0i4.860.11542.2617.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.72.8180.3720.76
21.150.011.150.014.860.41.03
1h01400e0(l0h)12
210.3714002.818(4.860.4)20.761.032
1.296
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.2962.8180.150.033.772m
0Ndefcdbx(h0x2)
0.959.0051037729.21000x(3703x2)
解得x64.5mmbh0207.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100064.50.959.0051028031929.6 mm²
13
用ø20@100mm,实际AS= 3142 mm²
0.51103fcu,kbh00.51103201000370
843.9KN0Vd0.99.758.78KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000370
196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。
(2)结点
l0=4.86m,h=0.55m,α=0.03m, h0=0.52m
e0MdNdbh122103.2259.0050.551221.749m
i0.1588
l0i4.860.158830.6017.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.71.7490.529.281
21.150.011.150.014.860.551.062
1h01400e0(l0h)12
210.5214001.749(4.860.55)9.2811.0622
1.163
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
14
ee0h21.1631.7490.5520.032.279
0Ndefcdbx(h0x2)
0.959.0051022799.21000x(5203x2)
解得x26mmbh0207.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.21000260.950.0059102803664.6 mm²
100ASbh0100664.610005200.130.2
需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²
0.51103fcu,kbh00.51103201000520
1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000520
275.6KN0Vd202.85KN
抗剪配筋按构造设置。
3.左、右侧板(B-A,C-D)
(1)板中
h=0.36m, l0=2.4m,α=0.03m, h0=0.33m
e0MdNdbh122120.5136.7393.28
i0.1039
l0i2.40.103923.09917.5
15
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.73.280.3327.036
21.150.011.150.012.40.41.09
1h01400e0(l0h)12
210.3314003.28(2.40.36)27.0361.092
1.094
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.0943.280.180.033.738m
0Ndefcdbx(h0x2)
0.936.7391037389.21000x(3303x2)
解得x43.6mmbh0184.8mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100043.60.936.7391028031314 mm²
用ø20@100mm,实际AS= 3142 mm²
0.501032ftdbh00.5110311.061000330
174.9KN0Vd0.923.9721.57KN抗剪配筋按构造设置。
(2)结点
h=0.51m, l0=2.4m,α=0.03m, h0=0.48m
16
e0MdNdbh122143.186232.6820.511220.615m
i0.147
l0i2.40.14716.3217.5
故不需要计算。
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h20.6150.2550.030.840m
0Ndefcdbx(h0x2)
0.9225.391108409.21000x(4803x2)
解得x40.3mmbh00.56510285.6mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100040.30.9225.391102803600 mm²
100ASbh010060010004800.1250.2
需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²
0.501032ftdbh00.5110311.061000480
254.4KN0Vd0.950.00545.005KN抗剪配筋按构造设置。
(五)基地验算
1.荷载计算
P箱2VL25(0.45.22220.3620.152)5.22227.11KN/m2
17
P土H190.713.3KN/m3VL22
24.88KN/m2P水10(4.520.152)3.6
W1q车3Lp3Lp22e车hp51.29235.2235.222217.12.836.53KN2W2q车e车hp51.29217.12.866.05KN2
P活W1l(W2W1)L236.535.22(66.0536.53)5.222267.73KN
偏心距
190.695.22e5.222277.045.2230.26m267.73
NP土P箱P水P车13.327.1124.88267.73333.02KN2.基底应力
由《公路桥涵地基与基础设计规范》(JTG D63-2007)第4.2.2-2式
63.8015.3325.22AW5.22 48.47
NM333.0269.61679.13
KPa
3.基底容许应力
基础宽度b=5.22m>2m,基础深度h=0.7+2.8=3.5m>3m,且1.754,故应按《公bh路桥涵地基与基础设计规范》(JTG D63-2007)第3.3条计算修正后的容许应力
K1=1.0 ,K2=2.0
[][0]K11(b2)K22(h3)
1001.019(5.222)2.019(3.53)180KPa18
79.13KPa180KPa
满足要求。
19
2024年2月19日发(作者:司安然)
箱涵结构计算
一、设计资料
净跨径L0为4.5m,净高位2m,箱涵填土高H为0.7m,土的摩擦角为30,土的容重γ1=19KN/m³,设箱涵采用C20砼和HRB335钢筋。
二、设计计算
(一)截面尺寸拟定(见图1)
顶板、底板厚度
δ=40cm (C1=15cm)
侧墙厚度 t=36cm (C2=15cm)
故 Lp=L0+t=4.5+0.36=4.86m
hp=ho+δ=2.0+0.4=2.4m
(二)荷载计算
1.恒载
恒载竖向压力
P =γ1
H+γ2δ=19×0.7+25×0.4 = 23.2 KN/㎡
恒载水平压力
顶板处
ep2 1 (Hh)tg2(45302)=19×0.7×tg²30º
=4.43 KN/㎡
底板处:
e
p2 1 (Hh)tg2(45302)=19 ×(0.7+2.8)×tg²30
1
=22.16 KN/㎡
2.活载
公里-Ⅱ级车辆荷载由《公路桥涵设计通用规范》(JTG D60-2004)第4.3.4条计算
一个汽车后轮横向分布宽
>0.6 +0.7tg30°=0.704m
21.8 < m
2故,两列车相邻车轴有荷载重叠,应按如下计算横向分布宽度
0.6a=( +0.7tg30°)×2+1.3=2.708 m
2同理,纵向:
0.2 +0.7tg30°=0.504<1.4/2m
2故
0.2b=( + 0.7tg30°)×2=1.008m
2车辆荷载垂直压力
140q车= = 51.29 KN/㎡
2.708×1.008车辆荷载水平压力
e车=51.29tg²30°=17.10 KN/㎡
三、 内力计算
1 .构件刚度比
1.3 m
22
1ep1
I1I2
121Lp12h110.410.36222.44.860.677
2 .节点弯矩和轴向力计算
(1)α种荷载作用下(图2)
涵洞四角节和弯矩:
1PLp²MaA=MaB=MaC=MaD= - ·
K+112Na1=Na2=0
PLpNa3= Na4=
2恒载(p=P)
-123.3×4.86²MaA= · = -27.351 KN·m
0.677+11223.3×4.86Na3= = 56.62KN
2车辆荷载(p=q车)
-151.29×4.86²MaA= · = 60.56 KN·m
0.677+11251.29×4.86Na3= = 124.63KN
2(2)b种荷载作用下(图3)
KPhp²MaA=MaB=MaC=MaD= - ·
K+112PhpNb1=Nb2=
2Na3= Na4=0
3
恒载(p=eP1)
M0.6774.43×2.4²bA= -
0.677+1 ·12 =-0.858 KN·m
N4.43×2.4b1=
2 =5.316KN
(3)C种荷载作用下(图4)
M(3K8)2cAMcDK(K1)(K3)Php60
K(2K7)Php2McBMcC(K1)(K3)60
NcMcAMcB1Php6h
pNcPhpMcAMcB23h
p恒载(p=ep2-ep1=22.16-4.43=17.73 KN)
M8)17.732.42cAMcD0.677(30.677(0.6771)(0.6773)60
= -1.875 KN·m
M(20.6777)732.42cBMcC0.677(0.6771)(0.6773)17.60
= -1.561 KN·m
Nc.732.41.56111761.8752.46.96KN
Nc17.732.41.8751.561232.414.315KN
(4)d种荷载作用下(图5)
M3)K2p2dA[K(K6(K24K3)1015K5]Ph4
4
MdB[K(K3)6(K24K3)5K315K55K315K510K215K5]Php4Php4Php42
2MdC[K(K3)6(K24K3)]
2MdA[K(K3)6(K24K3)]
Nd1MdDMDChp
Nd2PhpMdDMDChp
Nd3Nd4MdBMdhpC车辆荷载(P=e车=17.10 KN/m²)
K(K3)6(K24K3)5K315K50.677(0.6773)6(0.677240.6773)50.6773150.67750.0673
10K215K55K315K5100.6772150.677550.6773150.67750.5797
0.4213
2MdA(0.06730.5297)17.102.4417.102.4415.932KNm
2MdB(0.06730.4213)8.717KNm
MdC(0.06730.4213)17.102.4417.102.44225.113KNm
2MdA(0.06730.5297)12.617KNm
Nd112.61725.1132.415.72KN
5
Nd217.102.415.7225.32KN
Nd3Nd48.71725.1134.866.96KN
(5)节点弯矩和和轴力计算汇总表
M (KN·m)
荷载种类
A B C D 1 2 3 4
N(KN)
-27.35 -27.35 -27.35 -27.35
5.316
-0.858 -0.858 -0.858 -0.858
6.96
恒载 -1.875 -1.561 -1.561 -1.875
=
= = = =
12.276
-30.083 -29.969 -29.769 -30.083
19.631
14.315 56.62 56.62
5.316
-60.56 -60.56 -60.56 -60.56
-15.932 8.717 -25.113 12.617
车辆车载
= = = =
15.72 25.32
124.63 124.63
-6.96
=
-6.96
=
-76.49 -51.843 -85.673 -47.943 117.67 117.67
(6)荷载效应组合。按《公路桥涵设计通用规范》((JTG D60-2004)第4.1.6条进行承载能力极限状态效应组合
Sud=1.2SGK+1.4SQK
MA=1.2×(-30.083)+1.4×(-76.49) =-143.186 KN·m
MB=1.2×(-29.769)+1.4×(-51.843)=-108.303 KN·m
Mc=1.2×(-29.769)+1.4×(-85.673)=-155.665 KN·m
MD=1.2×(-30.083)+1.4×(-47.943)=-103.220 KN·m
6
N1=1.2×12.276+1.4×15.72=36.739KN·m
N2=1.2×19.631+1.4×25.32=59.005KN·m
N3=1.2×56.62+1.4×117.67=232.682KN·m
3、构件内力计算(跨中截面内力)
(1)顶板(图6-1)
xlp2
P=1.2×23.3+1.4×51.29=99.766 KN
Nx=N1=36.739KN·m
MxMBN3xPx22108.303232.6824.86299.7664.8682
=162.557 KN·m
Vx=P·x-N3=99.766×4.86 -232.682=9.75 KN
2(2)底板(图6-2)
W1Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)
2 = 80.85KN/㎡
W2Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)
2= 115.88 KN/㎡
xlp24.8622.43
Nx=N3=232.682KN
MxMAN3xW1x22x36LP(W2W1)
7
143.186232.6822.4380.85166.29KNmVxW1xx22.43222.43364.86(115.8880.85)
2LP(W2W1)N3
280.852.4314.94KN2.4324.86(115.8880.85)232.682
(3)左侧墙(图7)
W1= ep1+ e车=1.2×4.43+1.4×17.10=29.26 KN/㎡
W2= ep2+ e车=1.2×22.16+1.4×17.10=50.53 KN/㎡
xhp21.2
Nx= N3= 232.682 KN
MxMBN1xW1x22x36LP(W2W1)
108.30336.7391.229.2658.44KNmVxW1xx21.2221.2362.4(50.5329.26)
2hP(W2W1)N1
229.261.24.75KN1.222.4(50.5329.26)36.739
(4)右侧墙 (图8)
xhp21.2
W1= ep1 =1.2×4.43=5.32 KN/㎡
W2= ep2 =1.2×22.16=26.59 KN/㎡
8
Nx= N4= 232.682 KN
MxMCN1xW1x22x36LP(W2W1)
155.65536.7391.25.32120.51KNmVxW1xx21.2221.2362.4(26.595.32)
2hP(W2W1)N1
25.321.223.97KN1.222.4(29.595.32)36.739
(5)构件内力汇总表
构件 Md Nd
B
B-C
-108.303 36.739 232.682 162.557 36.739
A
A-D
-143.186 59.005
B
B-A
-108.303 232.682 36.739 -58.44 59.005
C
C-D
-155.665 232.682 36.739 -120.51 36.739 -23.97 -99.69 225.39 -59.005
C-D
4.75 -143.186 232.682 -59.005
D
225.39 166.29 59.005 -14.94 -103.220 59.005 -232.682
A-C A
9.75 -155.665 36.739 -232.682
D
Vd Md Nd
B-C
Vd Md Nd
C
Vd
(四)截面设计
1.顶板(B-C)
钢筋按左、右对称,用最不利荷载计算
(1)跨中
9
l0=4.86m,h=0.4m,α=0.03m, h0=0.37m
e0MdNdbh122162.55736.7390.41224.425
i0.115
l0i4.860.11542.2617.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.74.4250.3732.49
21.150.011.150.014.860.41.03
1h01400e0(l0h)12
210.3714004.425(4.860.4)32.491.032
1.295
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.2954.4250.20.035.900
0Ndefcdbx(h0x2)
0.936.7391059009.21000x(3703x2)
解得x62.6mmbh00.56370207.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100062.60.936.7391028031938.76 mm²
用ø20@100mm,实际AS= 3142 mm²
10
100ASbh0100314210003700.8490.2
满足《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第9.1.12条的规定。
0.51103fcu,kbh00.51103201000370
843.9KN0Vd0.99.758.78KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000370
196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。
(2)结点
l0=4.86m,h=0.55m,α=0.03m, h0=0.52m
e0MdNdbh122155.66536.7390.551224.237m
i0.1588
l0i4.860.158830.6017.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h00.22.74.2370.5222.20
21.150.01l0h1.150.014.860.5521.056
1h01400e0(l0h)12
211
10.5214004.237(4.860.55)22.21.0562
1.161
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.1614.2370.2750.035.164m
0Ndefcdbx(h0x2)
0.936.7391051649.21000x(5203x2)
解得x37mmbh0291.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.21000370.936.7391028031097.62 mm²
100ASbh01001097.6210005200.2110.2
用ø20@100mm,实际AS= 3142 mm²
满足《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第9.1.12条的规定。
0.51103fcu,kbh00.51103201000520
1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000520
275.6KN0Vd202.85KN
抗剪配筋按构造设置。
2.底板(A-D)
钢筋按左、右对称,用最不利荷载计算
12
(1)跨中
l0=4.86m,h=0.4m,α=0.03m, h0=0.37m
e0MdNdbh122166.2959.0050.41222.818
i0.115
l0i4.860.11542.2617.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.72.8180.3720.76
21.150.011.150.014.860.41.03
1h01400e0(l0h)12
210.3714002.818(4.860.4)20.761.032
1.296
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.2962.8180.150.033.772m
0Ndefcdbx(h0x2)
0.959.0051037729.21000x(3703x2)
解得x64.5mmbh0207.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100064.50.959.0051028031929.6 mm²
13
用ø20@100mm,实际AS= 3142 mm²
0.51103fcu,kbh00.51103201000370
843.9KN0Vd0.99.758.78KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000370
196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。
(2)结点
l0=4.86m,h=0.55m,α=0.03m, h0=0.52m
e0MdNdbh122103.2259.0050.551221.749m
i0.1588
l0i4.860.158830.6017.5
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.71.7490.529.281
21.150.011.150.014.860.551.062
1h01400e0(l0h)12
210.5214001.749(4.860.55)9.2811.0622
1.163
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
14
ee0h21.1631.7490.5520.032.279
0Ndefcdbx(h0x2)
0.959.0051022799.21000x(5203x2)
解得x26mmbh0207.2mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.21000260.950.0059102803664.6 mm²
100ASbh0100664.610005200.130.2
需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²
0.51103fcu,kbh00.51103201000520
1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。
0.501032ftdbh00.5110311.061000520
275.6KN0Vd202.85KN
抗剪配筋按构造设置。
3.左、右侧板(B-A,C-D)
(1)板中
h=0.36m, l0=2.4m,α=0.03m, h0=0.33m
e0MdNdbh122120.5136.7393.28
i0.1039
l0i2.40.103923.09917.5
15
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.10条
10.22.7e0h0l0h0.22.73.280.3327.036
21.150.011.150.012.40.41.09
1h01400e0(l0h)12
210.3314003.28(2.40.36)27.0361.092
1.094
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h21.0943.280.180.033.738m
0Ndefcdbx(h0x2)
0.936.7391037389.21000x(3303x2)
解得x43.6mmbh0184.8mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100043.60.936.7391028031314 mm²
用ø20@100mm,实际AS= 3142 mm²
0.501032ftdbh00.5110311.061000330
174.9KN0Vd0.923.9721.57KN抗剪配筋按构造设置。
(2)结点
h=0.51m, l0=2.4m,α=0.03m, h0=0.48m
16
e0MdNdbh122143.186232.6820.511220.615m
i0.147
l0i2.40.14716.3217.5
故不需要计算。
由《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)第5.3.5条
ee0h20.6150.2550.030.840m
0Ndefcdbx(h0x2)
0.9225.391108409.21000x(4803x2)
解得x40.3mmbh00.56510285.6mm,为大偏心受压构件。
Asfcdbx0Ndfsd9.2100040.30.9225.391102803600 mm²
100ASbh010060010004800.1250.2
需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²
0.501032ftdbh00.5110311.061000480
254.4KN0Vd0.950.00545.005KN抗剪配筋按构造设置。
(五)基地验算
1.荷载计算
P箱2VL25(0.45.22220.3620.152)5.22227.11KN/m2
17
P土H190.713.3KN/m3VL22
24.88KN/m2P水10(4.520.152)3.6
W1q车3Lp3Lp22e车hp51.29235.2235.222217.12.836.53KN2W2q车e车hp51.29217.12.866.05KN2
P活W1l(W2W1)L236.535.22(66.0536.53)5.222267.73KN
偏心距
190.695.22e5.222277.045.2230.26m267.73
NP土P箱P水P车13.327.1124.88267.73333.02KN2.基底应力
由《公路桥涵地基与基础设计规范》(JTG D63-2007)第4.2.2-2式
63.8015.3325.22AW5.22 48.47
NM333.0269.61679.13
KPa
3.基底容许应力
基础宽度b=5.22m>2m,基础深度h=0.7+2.8=3.5m>3m,且1.754,故应按《公bh路桥涵地基与基础设计规范》(JTG D63-2007)第3.3条计算修正后的容许应力
K1=1.0 ,K2=2.0
[][0]K11(b2)K22(h3)
1001.019(5.222)2.019(3.53)180KPa18
79.13KPa180KPa
满足要求。
19