design of truss for 12 meter span as per is

36 Pages·2012·0.42 MB·English

DESIGNER EXAMPLE
Trusses
DESIGN OF TRUSS FOR 12 METER SPANAS PER IS 800-1984
SPANOFTRUSS = 12M
BAYSPACING = 6.0M
WINDSPEED = 33MPERS
SLOPEOFROOF = 1IN3
THETA = 18.44DEGREE
MATERIALFORCONSTRUCTION = SHS/RHSOFTATASTRUCTURAYST-310
DEADLOAD(REF. IS:875PART1)1987
S/WOFSHEETING = 60N/SQMT
S/WOFPURLIN = 58.86N/MT
*NODALLOAD = 60X1.5X6.0+100X6.0 = 1140N
*NODALLOAD = 60X(1.5+0.9123)/2X6.0+100X6.0
= 1035N
*NODALLOAD = 60X0.9123X6.0+100X6.0 = 682N
*NODALLOAD = 60X0.9123/2X6.0+100X6.0 = 518N
LIVELOAD(REF. IS:875PART2)1987
LIVELOAD = 750N/SQMT
ASTHEROOFSLOPEISGREATERTHAN100
LIVELOAD = 750-(20X8.44)
= 581.2N/SQMT
581.2X2/3 = 388N/SQMT(WHILEDESIGNOFTRUSSL.L.
CANBETAKENAS2/3(CL.4.5.1IS:875PARTI)
MINIMUMLL = 400N/SQMT(TABLE2,IS:875PARTII)
*NODALLOAD = 400X1.5X6.0 = 3600N
*NODALLOAD = 400X(1.5+0.9123)/2X6.0 = 2895N
*NODALLOAD = 400X0.9123X6.0 = 2190N
*NODALLOAD = 400X0.9123/2X6.0 = 1095N
110
WINDLOAD (REF.IS875:PART31987)
BASICWINDFORCECALCULATION
BASICWINDSPEED(V) = 33M/S
b
DESIGNWINDSPEED(V ) = K X K X K X V
Z 1 2 3 b
DESIGNEDWINDPRESSURE(Pz) = 0.6X(V )2
Z
K (PROBABILTYFACTOR) ASSUMEDAS = 1.0
1
K (TERRAINHEIGHTFACTOR) ASSUMEDAS = 1.0
2
K (TOPOGRAPHYFACTOR) ASSUMEDAS = 1.0
3
DESIGNEDWINDSPEED(Vz) = 1X1X1X33= 33M/S
DESIGNEDWINDPRESSURE(Pz) = 0.6X332
= 653.4N/SQM
A)WIND0+PRESSURES
EXTERNALPRESSURECOEFFICIENT(CPe) (REF.IS875:PART31987TABLE.No–5)
BUILDINGHEIGHTRATIO = ½<h/w<3/2
ONWINDWARDSIDE = 0.77
ONLEEWARDSIDE = -0.52
INTERNALPRESSURECOEFFICIENT(CPi) (REF.IS875:PART3 1987)
(ASSUMINGNORMALPERMEABILITY)
CPi = ±0.2
TOTALPRESSURECOEFFICIENT = CPe+CPi
NODALLOADONWINDWARDSIDE
*NODALLOAD = 0.97X653.4X6.0X1.5
= 5705N FX=1805N FY=5413N
*NODALLOAD = 0.97X653.4X6.0X(1.5+0.9123)/2
= 4587N FX=1451 FY=4352N
*NODALLOAD = 0.97X653.4X6.0X0.9123
= 3470N FX=1098N FY=3292N
*NODALLOAD = 0.97X653.4X6.0X0.9123/2
= 1735N FX=549N FY=1646N
NODALLOADONLEEWARDSIDE
*NODALLOAD = 0.72X653.4X6.0X1.5
= 4236N FX=1340N FY=4019N
*NODALLOAD = 0.72X653.4X6.0X(1.5+0.9123)/2
= 3405N FX=1078N FY=2331N
*NODALLOAD = 0.72X653.4X6.0X0.9123
= 2576N FX=815N FY=2444N
*NODALLOAD = 0.72X653.4X6.0X0.9123/2
= 1288N FX=408N FY=1222N
111
B)WIND90+PRESSURE
CPeONWINDWARDSIDE = -0.8
CPeONLEEWARDSIDE = -0.8
CPi = ±0.2
TOTALPRESSURECOEFFICIENT = CPe+CPi
NODALLOADONWINDWARD/LEEWARDSIDE
*NODALLOAD = 1X653.4X6.0X1.5
= 5881N FX=1861N FY=5580N
*NODALLOAD = 1X653.4X6.0X(1.5+0.9123)/2
= 4729N FX=1496N FY=4487N
*NODALLOAD = 1X653.4X6.0X0.9123
= 3577N FX=1132N FY=3394N
*NODALLOAD = 1X653.4X6.0X0.9123/2
= 1789N FX=566N FY=1697N
LOADCOMBINATIONS
FOLLOWINGLOADCOMBINATIONSARECONSIDEREDFORDESIGNOFTRUSSES
1)DL+LL
2)(DL+WL)X0.75
ASPERIS800:1984CLAUSE3.9.2FORDESIGNOFTRUSSMEMBER,THESRESSESAREINCREASED
BY33%WHENWINDISCONSIDERED.
SUPPORTCONDITION
WHILEDESIGNOFTRUSS,ONESUPOORTASSUMEDASAPINNEDANDOTHERROLLER,SAMESHALL
BEENSUREDATTHESITE.
112
STAADOUTPUTFILE
STAAD.Pro
Version2007Build04
ProprietaryProgramofResearchEngineers,Intl.
Date=AUG5,2011
Time=17:30:57
USERID:acdc
1. STAADTRUSS
INPUTFILE:12MSPANBAY6SLOPE1IN333.STD
2. STARTJOBINFORMATION
3. ENGINEERDATE23-JAN-11
4. ENDJOBINFORMATION
5. INPUTWIDTH79
6. UNITMETERNEWTON
7. JOINTCOORDINATES
8. 1000;2600;3620;44.576971.525660;53.153951.051320
9. 61.730930.5769750;93.504400;101.9232500;114.752210;121200
10. 137.423031.525660;148.846051.051320;1510.26910.5769750
11. 188.495600;1910.076700;207.247810;210.8654650.2884870
12. 2211.13460.2884870
13. MEMBERINCIDENCES
14. 1110;232;334;445;556;6621;992;10109;12610;1359
15. 14911;15113;16411;18105;19511;201219;21313;221314
16. 231415;241522;27182;281918;301519;311418;321820;33203
17. 341320;361914;371420;38211;391021;402212;411922
18. DEFINEMATERIALSTART
19. ISOTROPICSTEEL
20. E2.05E+011
21. POISSON0.3
22. DENSITY77008.5
23. ALPHA1.2E-005
24. DAMP0.03
25. ENDDEFINEMATERIAL
26. MEMBERPROPERTYINDIAN
27. 2121316181930313436373941TABLESTTUB25252.6
28. 1910202728TABLESTTUB66333.6
29. 14153233TABLESTTUB66332.6
30. 3TO621TO243840TABLESTTUB50503.6
31. CONSTANTS
32. BETA90MEMB191014152027283233
33. MATERIALSTEELALL
34. SUPPORTS
35. 1PINNED
36. 12FIXEDBUTFXFZMXMYMZ
37. LOAD1LOADTYPEDEADTITLEDL
38. SELFWEIGHTY-1.05
39. *S/WOFSHEETING60N/SQMT
40. *S/WOFPURLIN=58.86N/MT
41. *NODALLOAD=60X1.5X4.5+100X4.5=855N
42. JOINTLOAD
43. 3TO51314FY-855
44. *NODALLOAD=60X(1.5+0.91)/2X4.5+100X4.5=776N
45. 615FY-776
46. *NODALLOAD=60X0.91X4.5+100X4.5=696N
47. 2122FY-696
48. *NODALLOAD=60X0.91/2X4.5+100X4.5=573N
49. 112FY-573
113
50. LOAD2LOADTYPELIVETITLELL
51. *750-20X8.44=581.2N/SQMT
52. *581.2X2/3=388
53. *LL=400N/SQMT
54. JOINTLOAD
55. *NODALLOAD=400X1.5X4.5=2700N
56. 3TO51314FY-2700
57. *NODALLOAD=400X(1.5+0.91)/2X4.5=2169N
58. 615FY-2169
59. *NODALLOAD=400X0.91X4.5=1638N
60. 2122FY-1638
61. *NODALLOAD=400X0.91/2X4.5=819N
62. 112FY-819
63. LOAD3LOADTYPEWINDTITLEWIND0+PRE
64. *WINDSPEED33M/S
65. *WINDPRE=.6X33^2=653.4N/SQMT
66. *CPEONWNDWARDSIDE=0.77
67. *CPEONLEWARDSIDE=-0.52
68. *CPEPRESSURE=-0.2
69. JOINTLOAD
70. *NODALLOADONWINDWARD=0.97X653.4X4.5X1.5=4279NFX=1354NFY=4059N
71. 45FX-1354FY4059
72. *NODALLOADONWINDWARD=0.97X653.4X4.5X(1.5+0.91)/2=3437NFX=1087NFY=3261
73. 6FX-1087FY3261
74. *NODALLOADONWINDWARD=0.97X653.4X4.5X0.91=2596NFX=821NFY=2463N
75. 21FX-821FY2463
76. *NODALLOADONWINDWARD=0.97X653.4X4.5X0.91/2=1298NFX=410NFY=1231N
77. 1FX-410FY1231
78. *NODALLOADONLEEWARDSIDE=.72X653.4X4.5X1.5=3176NFX=1004NFY=3013N
79. 1314FX1004FY3013
80. *NODALLOADONLEEWARDSIDE=.72X653.4X4.5X(1.5+0.91)/2=2552NFX=807NFY=242
81. 15FX807FY2422
82. *NODALLOADONLEEWARDSIDE=.72X653.4X4.5X0.91=1927NFX=609NFY=1829N
83. 22FX609FY1829
84. *NODALLOADONLEEWARDSIDE=.72X653.4X4.5X0.91/2=964NFX=305NFY=915N
85. 12FX305FY915
86. 3FX-175FY3536
87. LOAD4LOADTYPEWINDTITLEWIND90+PRE
88. *CPEONWNDWARDSIDE=0.8
89. *CPEONLEWARDSIDE=-0.8
90. JOINTLOAD
91. *NODALLOADONWINDWARDLEEWARDSIDE=1X653.4X4.5X1.5=4410NFX=1395NFY=418
92. 45FX-1395FY4184
93. 1314FX1395FY4184
94. *NODALLOADONWINDWARDLEEWARDSIDE=1X653.4X4.5X(1.5+0.91)/2=3544NFX=1120
95. 6FX-1120FY3363
96. 15FX1120FY3363
97. *NODALLOADONWINDWARDLEEWARDSIDE=1X653.4X4.5X0.91=2676NFX=846NFY=253
98. 21FX-846FY2539
99. 22FX846FY2539
100. *NODALLOADONWINDWARDLEEWARDSIDE=1X653.4X4.5X0.91/2=1338NFX=423NFY=1
101. 1FX-423FY1270
102. 12FX423FY1270
103. 3FY4184
104. LOAD21
105. REPEATLOAD
106. 11.333
107. LOAD22
108. REPEATLOAD
109. 21.333
114
110. LOAD23
111. REPEATLOAD
112. 31.333
113. LOAD24
114. REPEATLOAD
115. 41.333
116. LOADCOMB5COMBINATIONLOADCASE5
117. 211.0221.0
118. LOADCOMB6COMBINATIONLOADCASE6
119. 210.75230.75
120. LOADCOMB7COMBINATIONLOADCASE7
121. 210.75240.75
122. PERFORMANALYSIS
PROBLEM STATISTICS
NUMBEROFJOINTS/MEMBER+ELEMENTS/SUPPORTS=18/33/2
SOLVERUSEDISTHEOUT-OF-COREBASICSOLVER
ORIGINAL/FINALBAND-WIDTH = 16/4/10DOF
TOTALPRIMARYLOADCASES = 8,TOTALDEGREESOFFREEDOM=33
SIZEOFSTIFFNESSMATRIX = 1DOUBLEKILO-WORDS
REQRD/AVAIL.DISKSPACE = 12.1/111196.4MB
123. LOADLIST21TO24
124. PRINTSUPPORTREACTION
SUPPORTREACTIONS-UNITNEWTMETESTRUCTURETYPE=TRUSS
JOINT LOAD FORCE-X FORCE-Y FORCE-Z MOM-X MOM-Y MOMZ
1 21 0.00 6749.98 0.00 0.00 0.00 0.00
22 0.00 15164.19 0.00 0.00 0.00 0.00
23 1962.18 -21164.67 0.00 0.00 0.00 0.00
24 0.00 -23503.43 0.00 0.00 0.00 0.00
12 21 0.00 6749.99 0.00 0.00 0.00 0.00
22 0.00 15164.23 0.00 0.00 0.00 0.00
23 0.00 -18560.06 0.00 0.00 0.00 0.00
24 0.00 -23503.49 0.00 0.00 0.00 0.00
**************************ENDOFLATESTANALYSISRESULT **************************
125. LOADLIST5TO7
126. UNITMMSNEWTON
127. PARAMETER1
128. CODEINDIAN
129. KY0.85ALL
130. KZ0.85ALL
131. FYLD310ALL
132. LZ3200MEMB14153233
133. LZ3500MEMB1102028
134. LZ2500MEMB927
135. CHECKCODEALL
115
STAAD.ProCODECHECKING-(IS-800)
ALLUNITSARE-NEWTMMS(UNLESSOTHERWISENOTED)
MEMBER TABLE RESULT/ CRITICALCOND/ RATIO/ LOADING/
FX MY MZ LOCATION
1ST TUB66333.6 (INDIANSECTIONS)
PASS COMPRESSION 0.970 7
35398.23C 0.00 0.00 0.00
2ST TUB25252.6 (INDIANSECTIONS)
PASS TENSION 0.005 5
214.96T 0.00 0.00 0.00
3ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.631 5
52170.41C 0.00 0.00 1500.00
4ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.649 5
53703.45C 0.00 0.00 1499.99
5ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.681 5
56332.17C 0.00 0.00 1500.00
6ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.542 5
57595.48C 0.00 0.00 912.28
9ST TUB66333.6 (INDIANSECTIONS)
PASS COMPRESSION 0.652 7
16506.84C 0.00 0.00 0.00
10ST TUB66333.6 (INDIANSECTIONS)
PASS COMPRESSION 0.743 7
27118.47C 0.00 0.00 0.00
12ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.121 5
3815.95C 0.00 0.00 608.18
13ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.570 5
10006.71C 0.00 0.00 1108.19
14ST TUB66332.6 (INDIANSECTIONS)
PASS COMPRESSION 0.327 7
10702.59C 0.00 0.00 0.00
15ST TUB66332.6 (INDIANSECTIONS)
PASS COMPRESSION 0.479 7
15661.02C 0.00 0.00 0.00
16ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.139 5
4604.89C 0.00 0.00 554.10
18ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.544 7
5269.10C 0.00 0.00 0.00
19ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.504 7
4984.80C 0.00 0.00 0.00
20ST TUB66333.6 (INDIANSECTIONS)
PASS COMPRESSION 0.970 7
35395.62C 0.00 0.00 0.00
116
MEMBER TABLE RESULT/ CRITICALCOND/ RATIO/ LOADING/
FX MY MZ LOCATION
21ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.631 5
52170.30C 0.00 0.00 1500.00
22ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.649 5
53703.34C 0.00 0.00 1499.99
23ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.681 5
56330.50C 0.00 0.00 1500.03
24ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.542 5
57594.29C 0.00 0.00 912.31
27ST TUB66333.6 (INDIANSECTIONS)
PASS COMPRESSION 0.652 7
16506.84C 0.00 0.00 0.00
28ST TUB66333.6 (INDIANSECTIONS)
PASS COMPRESSION 0.743 7
27118.38C 0.00 0.00 0.00
30ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.121 5
3816.29C 0.00 0.00 608.21
31ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.570 5
10006.62C 0.00 0.00 1108.19
32ST TUB66332.6 (INDIANSECTIONS)
PASS COMPRESSION 0.327 7
10702.50C 0.00 0.00 0.00
33ST TUB66332.6 (INDIANSECTIONS)
PASS COMPRESSION 0.479 7
15660.94C 0.00 0.00 0.00
34ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.139 5
4604.90C 0.00 0.00 554.10
36ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.544 7
5268.08C 0.00 0.00 0.00
37ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.504 7
4984.80C 0.00 0.00 0.00
38ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.595 5
63137.25C 0.00 0.00 912.28
39ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.306 5
5452.78C 0.00 0.00 0.00
40ST TUB50503.6 (INDIANSECTIONS)
PASS COMPRESSION 0.595 5
63133.16C 0.00 0.00 912.22
41ST TUB25252.6 (INDIANSECTIONS)
PASS COMPRESSION 0.306 5
5449.18C 0.00 0.00 0.00
**************************ENDOFTABULATEDRESULTOFDESIGN **************************
117
136. *SELECTOPTIMIZED
137. PARAMETER2
138. CODEINDIAN
139. UNITMETERKG
140. STEELTAKEOFFALL
STEELTAKE-OFF
PROFILE LENGTH(METE) WEIGHT(KG)
STTUB66333.6 12.00 59.033
STTUB25252.6 15.17 25.667
STTUB50503.6 12.65 62.919
STTUB66332.6 6.40 23.549
----------------
TOTAL= 171.168
**************************ENDOFDATAFROMINTERNALSTORAGE **************************
141.FINISH
**************************ENDOFTHESTAAD.ProRUN **************************
MEMBER TABLE 12 M SPAN SLOPE 1 IN 3 BAY 6.0
SPEED33 SPEED39 SPEED44 SPEED47 SPEED50 SPEED55
MEMNO SECTION TOTAL SECTION TOTAL SECTION TOTAL SECTION TOTAL SECTION TOTAL SECTION TOTAL UNIT
1 50X50X3.6 63.00 50X50X3.6 63.00 50X50X3.6 63.00 50X50X3.6 63.00 50X50X3.6 63.00 60X60X3.2 69.58 KG
2 66X33X3.6 59.16 80X40X3.2 66.00 96X48X3.2 80.52 96X48X3.2 80.52 96X48X4 98.64 96X48X4.8 115.92 KG
3 25X25X2.6 3.71 25X25X2.6 3.71 25X25X2.6 3.71 25X25X2.6 3.71 25X25X2.6 3.71 25X25X2.6 3.71 KG
4 25X25X2.6 2.06 25X25X2.6 2.06 25X25X2.6 2.06 25X25X2.6 2.06 25X25X2.6 2.06 25X25X2.6 2.06 KG
5 25X25X2.6 5.48 25X25X2.6 5.48 32X32X2.6 7.32 32X32X2.6 7.32 32X32X2.6 7.32 32X32X2.6 7.32 KG
6 25X25X2.6 3.75 25X25X2.6 3.75 25X25X2.6 3.75 25X25X2.6 3.75 25X25X2.6 3.75 25X25X2.6 3.75 KG
7 25X25X2.6 5.41 25X25X2.6 5.41 32X32X2.6 7.23 32X32X2.6 7.23 32X32X2.6 7.23 32X32X2.6 7.23 KG
8 25X25X2.6 1.88 25X25X2.6 1.88 25X25X2.6 1.88 25X25X2.6 1.88 25X25X2.6 1.88 25X25X2.6 1.88 KG
9 66X33X2.6 23.62 66X33X2.6 23.62 66X33X2.6 23.62 66X33X3.6 31.55 66X33X3.6 31.55 80X40X3.2 35.20 KG
10 25X25X2.6 3.38 25X25X2.6 3.38 25X25X2.6 3.38 25X25X2.6 3.38 25X25X2.6 3.38 25X25X2.6 3.38 KG
TOTAL 171.43 TOTAL 178.27 TOTAL 196.46 TOTAL 204.40 TOTAL 222.52 TOTAL 250.03 KG
REACTION FX FY FX FY FX FY FX FY FX FY FX FY
DL 6750.0 6798.00 6921 6976 7100.0 7289.0 N
LL 15165.0 15165.00 15165 15165 15165.0 15165.0 N
WL0+PRE 1963.0 -21165.0 2741.0 -29564.00 3489.0 -37630 3981.0 -42933 4505.0 -48586.0 5451.0 -58795.0 N
-18561.0 -25925.00 -32999 -37650 -42607.0 -51559.0 N
WL90+PRE -23504.0 -32831.00 -41788 -47677 -53954 -65292.0 N
118
Portals
DESIGN OF PORTAL FOR 5 M SPANAS PER IS 800-1984
DIMENSIONSOFSHED = 5X25SQ.MT
SPAN = 5M
HTOFSHED = 5M
BAYSPACING = 4.5M
WINDSPEED = 33MPERS
SLOPE = 1IN3
THETA = 18.44DEGREE
TYPEOFSHEETING = A.CSHEETS
MATERIALFORCONSTRUCTION = SHS/RHSOFTATASTRUCTURAYST-310GRADE
FOLLOWINGLOADSARECONSIDEREDWHILEDESIGNOFPORTALS
DEADLOAD(ASPERIS-875PARTI)
S/WOFSHEETING = 170N/SQMT
S/WOFPURLIN = 100N/MT
NODALLOAD = 170X1.32X4.5+100X4.5=1460
LIVELOAD (ASPERIS-875PARTII)
750-20X8.44 = 581.2N/SQMT
581.2X2/3 = 388N/SQMT(WHILEDESIGNINGOFTRUSSES
LLCANBETAKENAS2/3,(CL4.5.1IS-875PARTI)
MINIMUMLL = 400N/SQMT(TABLE2IS-875,PARTII)
NODALLOAD = 400X1.32X4.5=2376N
WINDLOAD(ASPERIS-875PARTIII)
BASICWINDFORCECALCULATION
WINDSPEED(V) = 33m/s
b
DESIGNWINDSPEED(V) = K XK XK XV
z 1 2 3 b
DESIGNWINDPRESSURE(Pz) = 0.6XVz2
K1(PROBABILITYFACTOR) ASSUMEDAS = 1
K2(TERRAINHEIGHTFACTOR) ASSUMEDAS = 1
K3(TOPOGRAPHYFACTOR) ASSUMEDAS = 1
DESIGNWINDSPEED(Vz) = 1X1X1X33 =33m/s
DESIGNWINDPRESSURE(Pz) = 0.6X332
= 653.4N/SQMT
119