Khung Nha Xuong

TMTHUYET MINH TNH TOAN NHA XNGA /.TNH CHON XA GO :1/.Chon tiet dien :1 .Tai trong tac dung len xa go :S dung tam lp loai co chieu day=0.45mmTrong lng ton lp qtl=20.00Kg/m2o doc nhai %=20%a=11.31oBc xa gob=1m.Bc cotl=4.7m.He so vt tain=1.05Hoat tai phan bo chuanqc=30Kg/m2141=53.54Kg/m.q y = q x cosa=52.50Kg/m.q x = q x sina=10.50Kg/m.2.Moment uon tac dung len xa go :=144.97Kg.m.=7.25Kg.m.3.Moment chong uon tac dung len xa go :=6.90cm3,=0.35cm3,Xa go chonC150x12co:g2.86Kg/m.Wx16.99cm3Ix =129.1cm4Wy4.2cm3Iy =18.9cm42 /.Kiem tra tiet dien chon :1.Tai trong tac dung len xa go :=56.54Kg/m.qy = q x cosa=55.44Kg/m.qx = q x sina=11.09Kg/m.2.Moment uon tac dung len xa go :=153.10Kg.m.=7.65Kg.m.3.ng suat ln nhat do tac ong ong thi cua hai moment :=1,0832,205Kg/cm2,Thoa4.o vong xa go di tac dung cua tai trong qy (theo phng x a co he giang xa go):=1.299cm.0.00280.005=====>Thoa==>Nen xa go a chon la at yeu cau .B /.TNH TOAN KHUNG NGANG :ITAI TRONG TAC DUNG :1/.Tai trong thng xuyen :Ton lp20.00Kg/m2Xa go3.2Kg/mLay tnh tai mai tnh toan:20Kg/m22/.Tai trong tam thi ngan han :Tai trong sa cha30Kg/m2Tai trong gio theo TCVN 2737-95:aac tnh hnh hoc cua nha:Cao (nh cot) :5.9m.Nhp l:28m.h1/l =0.211a =11.3oBc cot b =4.7m.Do o :c1 =0.80c2 =-0.36c3 =-0.40c4 =-0.49bCong trnh xay dng taiONG NAIDo o thuoc vung ap lc gio2AT so chieu cao nha/nhp la :H/L =0.211< 1,5Nen khong tnh en thanh phan gio ong , ma ch tnh thanh phan tnh.Thanh phan tnh c xac nh :W = no x Wo x k x c x a .Wo =83Kg/m2.Dang a hnhATrong traiHe so ke en s thay o ap lc gio K =1.09bPha gio ay :W1 = no x Wo x k x c1 x a =340Kg/m.W2 = no x Wo x k x c2 x a =-153Kg/m.cPha gio hut :W3 = no x Wo x k x c3 x a =-170Kg/m.W4 = no x Wo x k x c4 x a =-207Kg/m.IIXAC NH NOI LC TRONG KHUNG :Dung SAP 2000 xac nh noi lc :(Xem phan phu luc)IIITNH TOAN VA CHON TIET DIEN :1 /.oi vi chi tiet cot :C1a.Tai chan cotNoi lc tnh toan :To hp s dung:C1Bao to hp t EtabN (Kg)Q (Kg)M (Kg.cm)2,6801,650609,000(chan cot cau tao khp)o lech tam e va chieu cao h tiet dien chan cot :227.2388059701cm.0.00E+0049.17cm.Tiet dien yeu cau :14.92cm2,Chon mat cat dang H . Co cac thong so sau :H (mm)250.00Ix (cm4)6,571.13B (mm)200.00Iy (cm4)1,334.31tf (mm)10.00Wx (cm3)525.69tw (mm)8.00Wy (cm3)133.43A (cm2)58.40Sx (cm3)292.90q (Kg/m)45.84Sy (cm3)100.00Kiem tra cac ieu kien ban bung va ban canhhw =28.8180Thoatwtf =1.32.5Thoatwhw =1.25ThoawfKiem tra tiet dien chon theo ieu kien ben :1,2042,300Kg/cm2,Thoab.Tai gia cotNoi lc tnh toan :To hp s dung:C1Bao to hp t EtabN (Kg )Q (Kg )M (Kg.cm )2,6801,650609,000o lech tam e va chieu cao h (s bo) tiet dien au cot :227.24cm.49.17cm.Tiet dien yeu cau :14.92cm2,Chon mat cat dang H . Co cac thong so sau :H (mm)250.00Ix (cm4)6,571.13B (mm)200.00Iy (cm4)1,334.31tf (mm)10.00Wx (cm3)525.69tw (mm)8.00Wy (cm3)133.43A (cm2)58.40Sx (cm3)292.90q (Kg/m)45.84Sy (cm3)100.00Kiem tra cac ieu kien ban bung va ban canhhw =28.75180Thoatwtf =1.252.5Thoatwhw =1.155ThoawfKiem tra tiet dien chon theo ieu kien ben :1,2042,300Kg/cm2,Thoab.Tai nh cotNoi lc tnh toan :To hp s dung:C1Bao to hp t EtabN (Kg )Q (Kg )M (Kg.cm )2,6801,650609,000o lech tam e va chieu cao h (s bo) tiet dien au cot :227.24cm.49.17cm.Tiet dien yeu cau :14.92cm2,Chon mat cat dang H . Co cac thong so sau :H (mm)250.00Ix (cm4)6,571.13B (mm)200.00Iy (cm4)1,334.31tf (mm)10.00Wx (cm3)525.69tw (mm)8.00Wy (cm3)133.43A (cm2)58.40Sx (cm3)292.90q (Kg/m)45.84Sy (cm3)100.00Kiem tra cac ieu kien ban bung va ban canhhw =28.75180Thoatwtf =1.252.5Thoatwhw =1.155ThoawfKiem tra tiet dien chon theo ieu kien ben :1,2042,300Kg/cm2,Thoac.Kiem tra cot theo ieu kien o manh :Chieu dai tnh toan :1.2Trong o:Jc va Lc la moment quan tnh tiet dien va chieu dai cotJr1, Jr2, lr1, lr2: Moment quan tnh tiet dien va chieu dai cac xa ngang lien ket vi cot o.Ta co:Lc =380(cm)Jc =6,571(cm4)Jr1 =3,891(cm4)Jr1 =3,891(cm4)lr1 =380(cm)lr2 =380(cm)V cot va mong co lien ket khp nen ta s dung cong thc:2.30873cm.o manh :82.34120Thoad.Kiem tra cot theo ieu kien on nh tong the:Trong mat phang uon :o lech tam tng oi m:24700181372.222222222225.24cm.2484021600Trong o9.00cm.2.73cm.1.09Trong o:2000mm2Dien tch 1 canh1840mm2Dien tch bungAcGia tr h khiAb0