基坑樁錨設(shè)計計算過程(手算)(已改無錯字)
2022-07-27 23:22:02 本頁面
【正文】 a1u=pa1U上 2 x (h基底xz0)Ea1u=()()/2Ea1U=T1+T2解得，x=haU=13(h基底xz0)haU=（）/3=Ea1u=U點處的彎矩，MU==pp1坑底= 2c1kp1==.pp1下=r1（h1 h坑底）kp1+2c1kp1= x ()+=EP1= (+)p下a1=（r1h1+q）ka12c1ka1 =(+20)=Ea1= ()/2=EP1+T1+T2Ea1即在坑底與第二層土間存在一個剪力為O的點，設(shè)為W，該點到第一層底面的距離為Y。pa2w下=[r1 h1+r2y+q]ka22c2ka2=[++20]=+pa2上=r1h1+qka22c2ka2=[+20]=p下a1=（r1h1+q）ka12c1ka1 =(+20)=Ea2w=pa2w下+pa2上2yEa1=pa1下2(h1z0)Ea1=()/2=.Ea2w=(++)y/2pp1上=2c1kp1=pp2上=+=pp1下=+=.pp2w下=[+]+=+EP1=pp1上+pp1下2 Ep2w=pp2w下+pp2上2yEP1=(+)Ep2w=(++)y/2EP1+EP2w+T1+T2=Ea2w+Ea1+[(++)y/2]=+++[(++)y/2]解得，y=W點處的彎矩，hp1=2pp1上+pp1下3(pp1上+pp1下）hp2w=2pp2上+pp2w下3(pp2上+pp2w下）yhp1=(+)(+)=pp2w下= pp2上= hp2w=ha1=13(h1z0)ha1=ha2w=2pa2上+pa2w下3(pa2上+pa2w下）ypa2上= pa2w下= ha2w=Mw=Ea2wha2w+Ea1ha1(EP1hp1+EP2whp2w+T1l1+T2l2)=+=八）錨桿計算：）錨桿配筋：Nk=(Ricos15176。) x Sh N=rorfNkN≤fpyAp Nk：錨桿軸向拉力標(biāo)準(zhǔn)值N：錨桿軸向拉力設(shè)計值Sh：錨桿間距fpy:預(yù)應(yīng)力筋拉強(qiáng)度設(shè)計值 Ap：預(yù)應(yīng)力筋的截面面積 第一排錨桿：N1=rorfNk= (176。)x2=.Ap1≥N1fp=πD2=πx162,選用HRB400。第二排錨桿：N1=rorfNk=(176。)x2=Ap2≥N2fp=π222，選用HRB400。）錨桿自由端長度：φm=+=lf≥(α1+α2dtanα)sin(45176。φm2)sin(45176。+φm2+α)+d/cosα+α1:錨桿錨頭中點到基坑底面的距離α2：基坑內(nèi)外側(cè)土壓力等值的點第一排錨桿的自由端長度：lf1≥(+176。)(sin45176。)sin(45176。+176。2+30176。)+1/cos30176。+lf1≥lf1=8m第二排錨桿的自由端長度：lf2≥(+176。)(sin45176。)sin(45176。+176。2+30176。)+1/cos30176。+lf2≥lf2=6m 錨桿固定端長度：RK≥KtNKK
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