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 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 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 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 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