chapter 12 連桿與桁架結構分析 analysis of links and trusses
Post on 21-Dec-2015
237 views
TRANSCRIPT
Chapter 12
連桿與桁架結構分析Analysis of Links and Trusses
2/29
Contents
12.1 LINK1: 2D連桿元素LINK1: 2D Link Element
12.2 實例 : 桁架設計Example: Analysis of a Truss Structure
12.3 實例 : 超靜定柱子之反力計算Example: Statically Indeterminate Reaction Force Analysi
s
12.4 實例 : 熱應力計算Example: Thermally Loaded Support Structure
12.5 連桿元素瀏覽Overview of Link Elements
12.6 練習題Exercises
3/29
第 12.1節
LINK1: 2D連桿元素LINK1: 2D Link Element
4/29
12.1.1 LINK1元素描述
5/29
12.1.2 LINK1輸入資料Element Name LINK1
Nodes I, J
Degrees of Freedom UX, UY
Real Constants AREA, ISTRN
Material Properties EX, ALPX, DENS, DAMP
Surface Loads None
Body Loads Temperature -- T(I), T(J)
Special Features Plasticity, Creep, Stress stiffening, Large deflection
6/29
12.1.3 LINK1輸出資料
7/29
第 12.2節
實例 : 桁架設計Example: Analysis of a Truss Structure
8/29
11.2.1 問題描述120 120 120 120 120
60
60
120
120
180
180
5000 lb 5000 lb
Unit of dimension: in.Material: SteelAll section areas = 5 in2
9/29
12.2.2 ANSYS Procedure (1/3)
01
02
03
04
05
06
07
08
09
10
11
12
13
FINISH
/CLEAR
/UNITS, BIN
YOUNG = 29E6 ! Young’s modulus
AREA = 5 ! Cross-sectional area
LOAD = 5000 ! Design load
/PREP7
ET, 1, LINK1
MP, EX, 1, YOUNG
R, 1, AREA
10/29
11.2.2 ANSYS Procedure (2/3)15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
N, 1, 0, 0
N, 2, 180, 0
N, 3, 0, 180
N, 4, 180, 180
N, 5, 30, 300
N, 6, 150, 300
N, 7, 30, 420
N, 8, 150, 420
N, 9, -90, 480
N, 10, 270, 480
N, 11, -210, 540
N, 12, -90, 540
N, 13, 30, 540
N, 14, 150, 540
N, 15, 270, 540
N, 16, 390, 540
EN, 1, 1, 2
EN, 2, 3, 4
EN, 3, 5, 6
EN, 4, 7, 8
EN, 5, 11, 12
EN, 6, 12, 13
EN, 7, 13, 14
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
EN, 8, 14, 15
EN, 9, 15, 16
EN, 10, 1, 3
EN, 11, 2, 4
EN, 12, 3, 5
EN, 13, 4, 6
EN, 14, 5, 7
EN, 15, 6, 8
EN, 16, 7, 9
EN, 17, 8, 10
EN, 18, 9, 11
EN, 19, 10, 16
EN, 20, 9, 12
EN, 21, 7, 13
EN, 22, 8, 14
EN, 23, 10, 15
EN, 24, 1, 4
EN, 25, 4, 5
EN, 26, 5, 8
EN, 27, 9, 13
EN, 28, 8, 13
EN, 29, 10, 14
FINISH
11/29
11.2.2 ANSYS Procedure (3/3)63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
/SOLU
D, 1, UY, 0
D, 2, UX, 0
D, 2, UY, 0
F, 11, FY, -LOAD
F, 16, FY, -LOAD
/PNUM, NODE, 1
/PNUM, ELEM, 1
/PBC, ALL,, 1
EPLOT
SOLVE
FINISH
/POST1
PLDISP, 2
ETABLE, MFORCE, SMISC, 1
ETABLE, STRESS, LS, 1
ETABLE, STRAIN, LEPEL, 1
PRETAB, MFORCE, STRESS, STRAIN
12/29
第 12.3節
實例 : 超靜定柱子之反力計算Example: Statically Indeterminate Reaction F
orce Analysis
13/29
12.3.1 問題描述
14/29
12.3.2 ANSYS Procedure (1/2)01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
FINISH
/CLEAR
/UNITS, BIN
/PREP7
ET, 1, LINK1
R, 1, 1
MP, EX, 1, 30E6
N, 1, 0 0
N, 2, 0, 4
N, 3, 0, 7
N, 4, 0, 10
E, 1, 2
E, 2, 3
E, 3, 4
FINISH
15/29
12.3.2 ANSYS Procedure (2/2)19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
/SOLU
D, 1, ALL, 0
D, 4, ALL, 0
F, 2, FY, -500
F, 3, FY, -1000
/PNUM, NODE, 1
/PNUM, ELEM, 1
/PBC, ALL,, 1
EPLOT
SOLVE
FINISH
/POST1
PRRSOL
16/29
第 12.4節
實例 : 熱應力計算Example: Thermally Loaded Support Structure
17/29
12.4.1 問題描述
18/29
12.4.2 ANSYS Procedure (1/2)01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FINISH
/CLEAR
/UNITS, BIN
/PREP7
ET, 1, LINK1
R, 1, .1
MP, EX, 1, 16E6
MP, ALPX, 1, 9.2E-6
MP, EX, 2, 30E6
MP, ALPX, 2, 7.0E-6
N, 1, -10, 0
N, 3, 10, 0
FILL
N, 4, -10, -20
N, 6, 10, -20
FILL
E, 1, 4
E, 3, 6
MAT, 2
E, 2, 5
CP, 1, UY, 5, 4, 6
FINISH
19/29
12.4.2 ANSYS Procedure (2/2)26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/SOLU
D, 1, ALL, 0,, 3, 1
F, 5, FY, -4000
TREF, 70
BFUNIF, TEMP, 80
/PNUM, NODE, 1
/PNUM, ELEM, 1
/PBC, ALL,, 1
EPLOT
SOLVE
FINISH
/POST1
ETABLE, STRESS, LS, 1
PRETAB, STRESS
20/29
第 12.5節
連桿元素瀏覽Overview of Link Elements
21/29
12.5.1 General Structural Links
22/29
12.5.2 Finite Strain Link
23/29
12.5.3 Tension-Only Structural Link
24/29
12.5.4 Explicit Dynamics
25/29
12.5.5 Conduction Links
26/29
12.5.6 Convection Link
27/29
12.5.7 Radiation Link
28/29
12.5.8 Coupled-Field Link
29/29
第 12.6節
練習題Exercises