独立基础

2柱脚:1000X1000

混凝土:C20

3荷载:N=1847.40kN

M X=777.43kN.M

V X=113.39kN

4基础埋深:d+h= 3.00m

5地基承载力标准值:f k=300kPa

6基底保护层:50mm

有关参数:h1=0h2=0

g1=18kN/m3 g2=20kN/m3

f t= 1.1N/mm2fc=10N/mm2

一级钢筋 f y=210N/mm2

二级钢筋 f y=310N/mm2

基础设计:a=1000mm b=1000mm h=1000mm a1=600mm b1=600mm h1=400mm

a2=500mm b2=500mm h2=300mm

a3=400mm b3=400mm h3=300mm

L=4000mm B=4000mm

A=L * B =16m2

W x= L * B2 / 6 =10.667m3

M x=V * h+M

=113.4+777.4

=890.8kN.m

f=f k +h1 * g1 (B - 3 ) + h2 * g2 (d - 0.5 )

=300.0+0+0

=300.0kPa < 1.1fk=330kPa

则： f=330.0kPa

基底压力验算:

G=g2 * A *(d +h) =960.00kN

e= M x / ( N +G ) =317mm < B / 6 =667mm

且: B - 3( B/2 - e ) =0mm < B / 4 =1000mm

OK!

Ps=(N+G) / A=175.46kPa <f=330kPa P smax= (N+G) / A + Mx / Wx =258.98kPa < 1.2 f =396kPa

P smin= (N+G) / A - Mx / Wx =91.95kPa OK!

冲切验算:

H01=h01=350mm

A L1= (b1 - H01) * [b1 + H01 +(a+2a2+2a3)]

=0.9375m2

F L1= P smax * A L1 =242.8kN

a m1= a + a2 + a3 + H01 =2250mm

F L1 / ( 0.6 f t * a m1 ) =163mm <H01OK!

H02=h01 + h2=650mm

A L2= [(b1+b2) - H02] * [(b1+b2) + H02 +(a+2a3) ]

= 1.5975m2

F L2= P smax * A L2 =413.7kN

a m2= a + a3 + H02 =2050mm

F L2 / ( 0.6 f t * a m2 ) =306mm <H02OK!

H03=h0=950mm

A L3= [(b1+b2+b3) - H03] * [(b1+b2+b3) + H03 +a ]

= 1.8975m2

F L2= P smax * A L3 =491.4kN

a m3=a + h03 =1950mm

F L3 / ( 0.6 f t * a m3 ) =382mm <H03OK!

剪切验算:

V=(P nmax+P s1)*(b1-h01)*b/2=246.45kN

0.07f c bh01=980kN

V<0.07f c bh01OK!

板底配筋:

X: P s1=233.92kPa

P s2=213.04kPa

P s3=196.34kPa

M1-1=[( P smax + P s1 - 2G/A ) / 2] *b12*(3L - 2a1) / 6

=186.45*0.360* 1.800

=120.82kN.m

M2-2=[( P smax + P s2 - 2G/A ) / 2] *(b1+b2)2*[3L - 2(a1+a2)] / 6 =176.01* 1.210* 1.633

347.86kN.m

M3-3=[( P smax + P s3 - 2G/A ) / 2] * (b1+b2+b3)2*[3L - 2(a1+a2+a3)] / 6 =167.66* 2.250* 1.500

=565.85kN.m

1826mm2 (一级钢筋) or1237mm2 (二级钢筋) A s1-1=M1-1 / ( 0.9h01 * f y ) =

A s2-2=M2-2 / ( 0.9h02 * f y ) =2832mm21918mm2

3151mm22135mm2

A s3-3=M3-3 / ( 0.9h03 * f y ) =

A smax=788mm2/m534mm2/m

A s实际=565mm2/m二级钢筋 12@200