4.7 Phn tch Automatic Mesh ca Frame v Area. 4.7.1 Automatic
Frame mesh
Ch c version Sap2000 v9 tr i
Sap2000 tnh ton da trn phng php phn t hu hn, cc phn t c chia cng
nh th tnh ton cng chnh xc. Tuy nhin vic chia cc phn t qu nh dn n
chng trnh nng nn v tc x l s rt chm, cng nh kh khn khi xut kt qu. Vi
cc phin bn Sap cao cho php ngi dng c th chia cc phn t t ng (Sap t
chia trong qu trnh chy v t kt hp khi hin th kt qu).
Hnh v trn, moment ca thanh dm nm ngang khi dng subdivide (bn
phi) v dng no auto subdivide (bn tri).
khai bo ngi dng thc hin cc bc sau: - Chn frame cn chia t ng. -
Trn menu Assign chn Frame sau chn Automatic Frame mesh xut hin
hp
thoi nh hnh v:
- C cc la chn No Auto Subdivision (khng chia), chn Auto
Subdivide Frame (at Intermediate Joints chia ti nhng ni c nt, at
intersection with other frames chia ti cc cc v tr m cc frame ct
nhau, Minimum Number of Segments Nhp v s on chia nh nht, Maximum
Length of Segments Nhp s khong cch ln nht). Ngi dng cng c th thay i
n v bng cch chn n v mi trong mc Units.
- Chn OK kt thc vic khai bo.
4.7.2 Automatic Area Mesh Cng ging nh Frame, khi s dng Automatic
Area Mesh cho php chia nh sn mt cch
t ng trong qu trnh tnh ton. Ti mi im chia nh, Sn v dm s c chuyn
v cng nhau. Vic chia nh sn s lm cho kt qu tnh ton ni lc dm m sn
truyn ti ln mt cch chnh xc hn.
khai bo ngi dng thc hin cc bc sau: - Chn Shell cn chia t ng. -
Trn menu Assign chn Area sau chn Automatic Area mesh xut hin hp
thoi
nh hnh v:
- C cc la chn No Auto Meshing (khng chia), chn Mesh Area Into
This Number of Objects (chia i tng thnh bao nhiu phn theo phng t 1
n 2 v t 1 n 3). Mesh Area Into Objects of This Maximum Size (chia i
tng thnh cc phm c kch thc ln nht theo 2 phng), Mesh Area Based On
Points On Area Edges (chia i tng thnh cc phn da trn cc im v ng
thng), .
