Design a truss structure to support a foot bridge with an unsupported span of 10
ID: 1713360 • Letter: D
Question
Design a truss structure to support a foot bridge with an unsupported span of 10m. Position the trsuss above the birdge. Make conservative of the loads the structure will need to support if the pathway supported by truss is made of wood. Estimate the maximum axial forces to which the members of the structure will be subjected.
Design a truss structure to support a foot bridge with an unsupported span of 10 m. Position the truss above the bridge. Make conservative estimates of the loads the structure will need to support if the pathway supported by the truss is made of wood. Estimate the maximum axial 1.Explanation / Answer
I have designed this bridge on STAAD pro with the following assumptions
1) Width 1.5m.
2) Dead load 200kg/m2.
3) Live load 300kg/m2
4) Truss depth 750mm
----------staad input-----------------------
STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 11-Nov-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 10 0 0; 5 1 0 0; 6 2 0 0; 7 3 0 0; 8 4 0 0; 9 5 0 0; 10 6 0 0;
11 7 0 0; 12 8 0 0; 13 9 0 0; 14 1 0.75 0; 15 2 0.75 0; 16 3 0.75 0;
17 4 0.75 0; 18 5 0.75 0; 19 6 0.75 0; 20 7 0.75 0; 21 8 0.75 0; 22 9 0.75 0;
23 0 0 1.5; 24 1 0 1.5; 25 2 0 1.5; 26 3 0 1.5; 27 4 0 1.5; 28 5 0 1.5;
29 6 0 1.5; 30 7 0 1.5; 31 8 0 1.5; 32 9 0 1.5; 33 10 0 1.5; 34 1 0.75 1.5;
35 2 0.75 1.5; 36 3 0.75 1.5; 37 4 0.75 1.5; 38 5 0.75 1.5; 39 6 0.75 1.5;
40 7 0.75 1.5; 41 8 0.75 1.5; 42 9 0.75 1.5;
MEMBER INCIDENCES
1 1 5; 3 5 6; 4 6 7; 5 7 8; 6 8 9; 7 9 10; 8 10 11; 9 11 12; 10 12 13; 11 13 2;
12 14 15; 13 15 16; 14 16 17; 15 17 18; 16 18 19; 17 19 20; 18 20 21; 19 21 22;
22 14 6; 23 15 7; 24 16 8; 25 17 9; 26 9 19; 27 10 20; 28 11 21; 29 12 22;
33 5 14; 34 6 15; 35 7 16; 36 8 17; 37 9 18; 38 10 19; 39 11 20; 40 12 21;
41 13 22; 42 1 14; 43 2 22; 44 23 24; 45 24 25; 46 25 26; 47 26 27; 48 27 28;
49 28 29; 50 29 30; 51 30 31; 52 31 32; 53 32 33; 54 34 35; 55 35 36; 56 36 37;
57 37 38; 58 38 39; 59 39 40; 60 40 41; 61 41 42; 62 34 25; 63 35 26; 64 36 27;
65 37 28; 66 28 39; 67 29 40; 68 30 41; 69 31 42; 70 24 34; 71 25 35; 72 26 36;
73 27 37; 74 28 38; 75 29 39; 76 30 40; 77 31 41; 78 32 42; 79 23 34; 80 33 42;
81 14 34; 82 15 35; 83 16 36; 84 17 37; 85 18 38; 86 19 39; 87 20 40; 88 21 41;
89 22 42; 90 5 24; 91 6 25; 92 7 26; 93 8 27; 94 9 28; 95 10 29; 96 11 30;
97 12 31; 98 13 32; 99 34 15; 100 15 36; 101 36 17; 102 17 38; 103 38 19;
104 19 40; 105 40 21; 106 21 42; 107 23 5; 108 5 25; 109 25 7; 110 7 27;
111 27 9; 112 9 29; 113 29 11; 114 11 31; 115 31 13; 116 13 33;
SUPPORTS
1 23 PINNED
2 33 FIXED BUT FX MX MY MZ
MEMBER TRUSS
22 TO 29 33 TO 41 62 TO 78 81 TO 116
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.05e+008
POISSON 0.3
DENSITY 76.8195
ALPHA 1.2e-005
DAMP 0.03
TYPE STEEL
STRENGTH FY 253200 FU 407800 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY INDIAN
1 3 TO 19 22 TO 29 33 TO 116 TABLE ST ISA75X75X8
CONSTANTS
MATERIAL STEEL ALL
LOAD 1 LOADTYPE Dead TITLE DEAD LOAD
SELFWEIGHT Y -1
MEMBER LOAD
12 TO 19 42 43 54 TO 61 79 80 UNI GY -1.5
LOAD 2 LOADTYPE Live REDUCIBLE TITLE LIVE LOAD
MEMBER LOAD
12 TO 19 42 43 54 TO 61 79 80 UNI GY -2.25
LOAD COMB 101 DL + LL
1 1.0 2 1.0
LOAD COMB 201 1.5(DL + LL)
1 1.5 2 1.5
PERFORM ANALYSIS PRINT STATICS CHECK
PARAMETER 1
CODE IS800 LSD
CHECK CODE ALL
FINISH
**********************************
maximum axial force is 115 kN compression & 110 kN Tension
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.