最新消息: USBMI致力于为网友们分享Windows、安卓、IOS等主流手机系统相关的资讯以及评测、同时提供相关教程、应用、软件下载等服务。

箱涵设计计算

IT圈 admin 23浏览 0评论

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 (Hh)tg2(45302)=19×0.7×tg²30º

=4.43 KN/㎡

底板处:

e

p2 1 (Hh)tg2(45302)=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

121Lp12h110.410.36222.44.860.677

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(3K8)2cAMcDK(K1)(K3)Php60

K(2K7)Php2McBMcC(K1)(K3)60

NcMcAMcB1Php6h

pNcPhpMcAMcB23h

p恒载(p=ep2-ep1=22.16-4.43=17.73 KN)

M8)17.732.42cAMcD0.677(30.677(0.6771)(0.6773)60

= -1.875 KN·m

M(20.6777)732.42cBMcC0.677(0.6771)(0.6773)17.60

= -1.561 KN·m

Nc.732.41.56111761.8752.46.96KN

Nc17.732.41.8751.561232.414.315KN

(4)d种荷载作用下(图5)

M3)K2p2dA[K(K6(K24K3)1015K5]Ph4

4

MdB[K(K3)6(K24K3)5K315K55K315K510K215K5]Php4Php4Php42

2MdC[K(K3)6(K24K3)]

2MdA[K(K3)6(K24K3)]

Nd1MdDMDChp

Nd2PhpMdDMDChp

Nd3Nd4MdBMdhpC车辆荷载(P=e车=17.10 KN/m²)

K(K3)6(K24K3)5K315K50.677(0.6773)6(0.677240.6773)50.6773150.67750.0673

10K215K55K315K5100.6772150.677550.6773150.67750.5797

0.4213

2MdA(0.06730.5297)17.102.4417.102.4415.932KNm

2MdB(0.06730.4213)8.717KNm

MdC(0.06730.4213)17.102.4417.102.44225.113KNm

2MdA(0.06730.5297)12.617KNm

Nd112.61725.1132.415.72KN

5

Nd217.102.415.7225.32KN

Nd3Nd48.71725.1134.866.96KN

(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)

xlp2

P=1.2×23.3+1.4×51.29=99.766 KN

Nx=N1=36.739KN·m

MxMBN3xPx22108.303232.6824.86299.7664.8682

=162.557 KN·m

Vx=P·x-N3=99.766×4.86 -232.682=9.75 KN

2(2)底板(图6-2)

W1Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)

2 = 80.85KN/㎡

W2Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)

2= 115.88 KN/㎡

xlp24.8622.43

Nx=N3=232.682KN

MxMAN3xW1x22x36LP(W2W1)

7

143.186232.6822.4380.85166.29KNmVxW1xx22.43222.43364.86(115.8880.85)

2LP(W2W1)N3

280.852.4314.94KN2.4324.86(115.8880.85)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/㎡

xhp21.2

Nx= N3= 232.682 KN

MxMBN1xW1x22x36LP(W2W1)

108.30336.7391.229.2658.44KNmVxW1xx21.2221.2362.4(50.5329.26)

2hP(W2W1)N1

229.261.24.75KN1.222.4(50.5329.26)36.739

(4)右侧墙 (图8)

xhp21.2

W1= ep1 =1.2×4.43=5.32 KN/㎡

W2= ep2 =1.2×22.16=26.59 KN/㎡

8

Nx= N4= 232.682 KN

MxMCN1xW1x22x36LP(W2W1)

155.65536.7391.25.32120.51KNmVxW1xx21.2221.2362.4(26.595.32)

2hP(W2W1)N1

25.321.223.97KN1.222.4(29.595.32)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

e0MdNdbh122162.55736.7390.41224.425

i0.115

l0i4.860.11542.2617.5

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

10.22.7e0h0l0h0.22.74.4250.3732.49

21.150.011.150.014.860.41.03

1h01400e0(l0h)12

210.3714004.425(4.860.4)32.491.032

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

ee0h21.2954.4250.20.035.900

0Ndefcdbx(h0x2)

0.936.7391059009.21000x(3703x2)

解得x62.6mmbh00.56370207.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100062.60.936.7391028031938.76 mm²

用ø20@100mm,实际AS= 3142 mm²

10

100ASbh0100314210003700.8490.2

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。

0.51103fcu,kbh00.51103201000370

843.9KN0Vd0.99.758.78KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000370

196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。

(2)结点

l0=4.86m,h=0.55m,α=0.03m, h0=0.52m

e0MdNdbh122155.66536.7390.551224.237m

i0.1588

l0i4.860.158830.6017.5

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

10.22.7e0h00.22.74.2370.5222.20

21.150.01l0h1.150.014.860.5521.056

1h01400e0(l0h)12

211

10.5214004.237(4.860.55)22.21.0562

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

ee0h21.1614.2370.2750.035.164m

0Ndefcdbx(h0x2)

0.936.7391051649.21000x(5203x2)

解得x37mmbh0291.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.21000370.936.7391028031097.62 mm²

100ASbh01001097.6210005200.2110.2

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。

0.51103fcu,kbh00.51103201000520

1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000520

275.6KN0Vd202.85KN

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

e0MdNdbh122166.2959.0050.41222.818

i0.115

l0i4.860.11542.2617.5

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

10.22.7e0h0l0h0.22.72.8180.3720.76

21.150.011.150.014.860.41.03

1h01400e0(l0h)12

210.3714002.818(4.860.4)20.761.032

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

ee0h21.2962.8180.150.033.772m

0Ndefcdbx(h0x2)

0.959.0051037729.21000x(3703x2)

解得x64.5mmbh0207.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100064.50.959.0051028031929.6 mm²

13

用ø20@100mm,实际AS= 3142 mm²

0.51103fcu,kbh00.51103201000370

843.9KN0Vd0.99.758.78KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000370

196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。

(2)结点

l0=4.86m,h=0.55m,α=0.03m, h0=0.52m

e0MdNdbh122103.2259.0050.551221.749m

i0.1588

l0i4.860.158830.6017.5

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

10.22.7e0h0l0h0.22.71.7490.529.281

21.150.011.150.014.860.551.062

1h01400e0(l0h)12

210.5214001.749(4.860.55)9.2811.0622

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

ee0h21.1631.7490.5520.032.279

0Ndefcdbx(h0x2)

0.959.0051022799.21000x(5203x2)

解得x26mmbh0207.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.21000260.950.0059102803664.6 mm²

100ASbh0100664.610005200.130.2

需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²

0.51103fcu,kbh00.51103201000520

1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000520

275.6KN0Vd202.85KN

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

e0MdNdbh122120.5136.7393.28

i0.1039

l0i2.40.103923.09917.5

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

10.22.7e0h0l0h0.22.73.280.3327.036

21.150.011.150.012.40.41.09

1h01400e0(l0h)12

210.3314003.28(2.40.36)27.0361.092

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

ee0h21.0943.280.180.033.738m

0Ndefcdbx(h0x2)

0.936.7391037389.21000x(3303x2)

解得x43.6mmbh0184.8mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100043.60.936.7391028031314 mm²

用ø20@100mm,实际AS= 3142 mm²

0.501032ftdbh00.5110311.061000330

174.9KN0Vd0.923.9721.57KN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

e0MdNdbh122143.186232.6820.511220.615m

i0.147

l0i2.40.14716.3217.5

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

ee0h20.6150.2550.030.840m

0Ndefcdbx(h0x2)

0.9225.391108409.21000x(4803x2)

解得x40.3mmbh00.56510285.6mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100040.30.9225.391102803600 mm²

100ASbh010060010004800.1250.2

需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²

0.501032ftdbh00.5110311.061000480

254.4KN0Vd0.950.00545.005KN抗剪配筋按构造设置。

(五)基地验算

1.荷载计算

P箱2VL25(0.45.22220.3620.152)5.22227.11KN/m2

17

P土H190.713.3KN/m3VL22

24.88KN/m2P水10(4.520.152)3.6

W1q车3Lp3Lp22e车hp51.29235.2235.222217.12.836.53KN2W2q车e车hp51.29217.12.866.05KN2

P活W1l(W2W1)L236.535.22(66.0536.53)5.222267.73KN

偏心距

190.695.22e5.222277.045.2230.26m267.73

NP土P箱P水P车13.327.1124.88267.73333.02KN2.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

63.8015.3325.22AW5.22 48.47

NM333.0269.61679.13

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1.754,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]K11(b2)K22(h3)

1001.019(5.222)2.019(3.53)180KPa18

79.13KPa180KPa

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 (Hh)tg2(45302)=19×0.7×tg²30º

=4.43 KN/㎡

底板处:

e

p2 1 (Hh)tg2(45302)=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

121Lp12h110.410.36222.44.860.677

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(3K8)2cAMcDK(K1)(K3)Php60

K(2K7)Php2McBMcC(K1)(K3)60

NcMcAMcB1Php6h

pNcPhpMcAMcB23h

p恒载(p=ep2-ep1=22.16-4.43=17.73 KN)

M8)17.732.42cAMcD0.677(30.677(0.6771)(0.6773)60

= -1.875 KN·m

M(20.6777)732.42cBMcC0.677(0.6771)(0.6773)17.60

= -1.561 KN·m

Nc.732.41.56111761.8752.46.96KN

Nc17.732.41.8751.561232.414.315KN

(4)d种荷载作用下(图5)

M3)K2p2dA[K(K6(K24K3)1015K5]Ph4

4

MdB[K(K3)6(K24K3)5K315K55K315K510K215K5]Php4Php4Php42

2MdC[K(K3)6(K24K3)]

2MdA[K(K3)6(K24K3)]

Nd1MdDMDChp

Nd2PhpMdDMDChp

Nd3Nd4MdBMdhpC车辆荷载(P=e车=17.10 KN/m²)

K(K3)6(K24K3)5K315K50.677(0.6773)6(0.677240.6773)50.6773150.67750.0673

10K215K55K315K5100.6772150.677550.6773150.67750.5797

0.4213

2MdA(0.06730.5297)17.102.4417.102.4415.932KNm

2MdB(0.06730.4213)8.717KNm

MdC(0.06730.4213)17.102.4417.102.44225.113KNm

2MdA(0.06730.5297)12.617KNm

Nd112.61725.1132.415.72KN

5

Nd217.102.415.7225.32KN

Nd3Nd48.71725.1134.866.96KN

(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)

xlp2

P=1.2×23.3+1.4×51.29=99.766 KN

Nx=N1=36.739KN·m

MxMBN3xPx22108.303232.6824.86299.7664.8682

=162.557 KN·m

Vx=P·x-N3=99.766×4.86 -232.682=9.75 KN

2(2)底板(图6-2)

W1Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)

2 = 80.85KN/㎡

W2Pq车3L2pe车hp1.223.31.4(50.29234.86217.102.4)

2= 115.88 KN/㎡

xlp24.8622.43

Nx=N3=232.682KN

MxMAN3xW1x22x36LP(W2W1)

7

143.186232.6822.4380.85166.29KNmVxW1xx22.43222.43364.86(115.8880.85)

2LP(W2W1)N3

280.852.4314.94KN2.4324.86(115.8880.85)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/㎡

xhp21.2

Nx= N3= 232.682 KN

MxMBN1xW1x22x36LP(W2W1)

108.30336.7391.229.2658.44KNmVxW1xx21.2221.2362.4(50.5329.26)

2hP(W2W1)N1

229.261.24.75KN1.222.4(50.5329.26)36.739

(4)右侧墙 (图8)

xhp21.2

W1= ep1 =1.2×4.43=5.32 KN/㎡

W2= ep2 =1.2×22.16=26.59 KN/㎡

8

Nx= N4= 232.682 KN

MxMCN1xW1x22x36LP(W2W1)

155.65536.7391.25.32120.51KNmVxW1xx21.2221.2362.4(26.595.32)

2hP(W2W1)N1

25.321.223.97KN1.222.4(29.595.32)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

e0MdNdbh122162.55736.7390.41224.425

i0.115

l0i4.860.11542.2617.5

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

10.22.7e0h0l0h0.22.74.4250.3732.49

21.150.011.150.014.860.41.03

1h01400e0(l0h)12

210.3714004.425(4.860.4)32.491.032

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

ee0h21.2954.4250.20.035.900

0Ndefcdbx(h0x2)

0.936.7391059009.21000x(3703x2)

解得x62.6mmbh00.56370207.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100062.60.936.7391028031938.76 mm²

用ø20@100mm,实际AS= 3142 mm²

10

100ASbh0100314210003700.8490.2

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。

0.51103fcu,kbh00.51103201000370

843.9KN0Vd0.99.758.78KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000370

196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。

(2)结点

l0=4.86m,h=0.55m,α=0.03m, h0=0.52m

e0MdNdbh122155.66536.7390.551224.237m

i0.1588

l0i4.860.158830.6017.5

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

10.22.7e0h00.22.74.2370.5222.20

21.150.01l0h1.150.014.860.5521.056

1h01400e0(l0h)12

211

10.5214004.237(4.860.55)22.21.0562

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

ee0h21.1614.2370.2750.035.164m

0Ndefcdbx(h0x2)

0.936.7391051649.21000x(5203x2)

解得x37mmbh0291.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.21000370.936.7391028031097.62 mm²

100ASbh01001097.6210005200.2110.2

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。

0.51103fcu,kbh00.51103201000520

1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000520

275.6KN0Vd202.85KN

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

e0MdNdbh122166.2959.0050.41222.818

i0.115

l0i4.860.11542.2617.5

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

10.22.7e0h0l0h0.22.72.8180.3720.76

21.150.011.150.014.860.41.03

1h01400e0(l0h)12

210.3714002.818(4.860.4)20.761.032

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

ee0h21.2962.8180.150.033.772m

0Ndefcdbx(h0x2)

0.959.0051037729.21000x(3703x2)

解得x64.5mmbh0207.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100064.50.959.0051028031929.6 mm²

13

用ø20@100mm,实际AS= 3142 mm²

0.51103fcu,kbh00.51103201000370

843.9KN0Vd0.99.758.78KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000370

196.1KN0Vd0.99.758.78KN抗剪配筋按构造设置。

(2)结点

l0=4.86m,h=0.55m,α=0.03m, h0=0.52m

e0MdNdbh122103.2259.0050.551221.749m

i0.1588

l0i4.860.158830.6017.5

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

10.22.7e0h0l0h0.22.71.7490.529.281

21.150.011.150.014.860.551.062

1h01400e0(l0h)12

210.5214001.749(4.860.55)9.2811.0622

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

ee0h21.1631.7490.5520.032.279

0Ndefcdbx(h0x2)

0.959.0051022799.21000x(5203x2)

解得x26mmbh0207.2mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.21000260.950.0059102803664.6 mm²

100ASbh0100664.610005200.130.2

需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²

0.51103fcu,kbh00.51103201000520

1186KN0Vd0.9225.391202.85KN截面尺寸符合规定。

0.501032ftdbh00.5110311.061000520

275.6KN0Vd202.85KN

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

e0MdNdbh122120.5136.7393.28

i0.1039

l0i2.40.103923.09917.5

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

10.22.7e0h0l0h0.22.73.280.3327.036

21.150.011.150.012.40.41.09

1h01400e0(l0h)12

210.3314003.28(2.40.36)27.0361.092

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

ee0h21.0943.280.180.033.738m

0Ndefcdbx(h0x2)

0.936.7391037389.21000x(3303x2)

解得x43.6mmbh0184.8mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100043.60.936.7391028031314 mm²

用ø20@100mm,实际AS= 3142 mm²

0.501032ftdbh00.5110311.061000330

174.9KN0Vd0.923.9721.57KN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

e0MdNdbh122143.186232.6820.511220.615m

i0.147

l0i2.40.14716.3217.5

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

ee0h20.6150.2550.030.840m

0Ndefcdbx(h0x2)

0.9225.391108409.21000x(4803x2)

解得x40.3mmbh00.56510285.6mm,为大偏心受压构件。

Asfcdbx0Ndfsd9.2100040.30.9225.391102803600 mm²

100ASbh010060010004800.1250.2

需按最小配筋率配置受拉钢筋,用ø20@100mm,实际AS= 3142 mm²

0.501032ftdbh00.5110311.061000480

254.4KN0Vd0.950.00545.005KN抗剪配筋按构造设置。

(五)基地验算

1.荷载计算

P箱2VL25(0.45.22220.3620.152)5.22227.11KN/m2

17

P土H190.713.3KN/m3VL22

24.88KN/m2P水10(4.520.152)3.6

W1q车3Lp3Lp22e车hp51.29235.2235.222217.12.836.53KN2W2q车e车hp51.29217.12.866.05KN2

P活W1l(W2W1)L236.535.22(66.0536.53)5.222267.73KN

偏心距

190.695.22e5.222277.045.2230.26m267.73

NP土P箱P水P车13.327.1124.88267.73333.02KN2.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

63.8015.3325.22AW5.22 48.47

NM333.0269.61679.13

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1.754,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]K11(b2)K22(h3)

1001.019(5.222)2.019(3.53)180KPa18

79.13KPa180KPa

满足要求。

19

发布评论

评论列表 (0)

  1. 暂无评论