I have a 106'-3" skewed through girder rail road bridge, the skew is very large about 55 deg. I created a 3D model and run the moving train load across the bridge. The maximum moment in the girders is coming out very low. I have had multiple people review my input and so far no one can find anything wrong. I was hoping someone would have some insight into weather STAAD can handle large skews, if there is a trick to producing the correct moments for large skewed bridges or if I need to purchase the STAAD.Beava add on program?
Thank you, I have included my input below:
STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 18-SEPT-15
JOB NAME Bridge 118 - Girder
ENGINEER NAME AMW
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
100 0 0 -16.667; 101 9.458 0 -16.667; 102 14.458 0 -16.667;
103 20.75 0 -16.667; 104 21.958 0 -16.667; 105 28.458 0 -16.667;
106 33.833 0 -16.667; 107 45.708 0 -16.667; 108 57.583 0 -16.667;
109 69.458 0 -16.667; 110 77.583 0 -16.667; 111 81.333 0 -16.667;
112 85.292 0 -16.667; 113 93.208 0 -16.667; 114 94.167 0 -16.667;
115 97.083 0 -16.667; 116 105.083 0 -16.667; 117 106.25 0 -16.667;
200 20.792 0 0; 201 21.958 0 0; 202 29.958 0 0; 203 32.875 0 0; 204 33.833 0 0;
205 41.75 0 0; 206 45.708 0 0; 207 49.458 0 0; 208 57.583 0 0; 209 69.458 0 0;
210 81.333 0 0; 211 93.208 0 0; 212 98.583 0 0; 213 105.083 0 0;
214 106.292 0 0; 215 112.583 0 0; 216 117.583 0 0; 217 127.042 0 0;
300 6.341 0 -11.583; 301 21.958 0 -11.583; 302 33.833 0 -11.583;
303 45.708 0 -11.583; 304 57.583 0 -11.583; 305 69.458 0 -11.583;
306 81.333 0 -11.583; 307 93.208 0 -11.583; 308 105.083 0 -11.583;
309 112.591 0 -11.583; 310 -5 0 -11.583; 311 140 0 -11.583;
400 14.45 0 -5.083; 401 21.958 0 -5.083; 402 33.833 0 -5.083;
403 45.708 0 -5.083; 404 57.583 0 -5.083; 405 69.458 0 -5.083;
406 81.333 0 -5.083; 407 93.208 0 -5.083; 408 105.083 0 -5.083;
409 120.700 0 -5.083; 410 -5 0 -5.083; 411 140 0 -5.083;
MEMBER INCIDENCES
100 100 101; 101 101 102; 102 102 103; 103 103 104; 104 104 105; 105 105 106;
106 106 107; 107 107 108; 108 108 109; 109 109 110; 110 110 111; 111 111 112;
112 112 113; 113 113 114; 114 114 115; 115 115 116; 116 116 117;
200 200 201; 201 201 202; 202 202 203; 203 203 204; 204 204 205; 205 205 206;
206 206 207; 207 207 208; 208 208 209; 209 209 210; 210 210 211; 211 211 212;
212 212 213; 213 213 214; 214 214 215; 215 215 216; 216 216 217;
300 300 301; 301 301 302; 302 302 303; 303 303 304; 304 304 305; 305 305 306;
306 306 307; 307 307 308; 308 308 309; 309 310 300; 310 309 311;
400 400 401; 401 401 402; 402 402 403; 403 403 404; 404 404 405; 405 405 406;
406 406 407; 407 407 408; 408 408 409; 409 410 400; 410 409 411;
500 104 301; 501 301 401; 502 401 201;
600 106 302; 601 302 402; 602 402 204;
700 107 303; 701 303 403; 702 403 206;
800 108 304; 801 304 404; 802 404 208;
900 109 305; 901 305 405; 902 405 209;
1000 111 306; 1001 306 406; 1002 406 210;
1100 113 307; 1101 307 407; 1102 407 211;
1200 116 308; 1201 308 408; 1202 408 213;
1400 104 204; 1401 201 106; 1402 106 206; 1403 204 107; 1404 107 208;
1405 206 108; 1406 108 209; 1407 208 109; 1408 109 210; 1409 209 111;
1410 111 211; 1411 210 113; 1412 113 213; 1413 211 116;
START GROUP DEFINITION
MEMBER
_100_GIRDER 100 TO 116
_200_GIRDER 200 TO 216
_300_STRINGER 300 TO 310
_400_STRINGER 400 TO 410
_FLOORBEAMS 500 TO 502 600 TO 602 700 TO 702 800 TO 802 900 TO 902 -
1000 TO 1002 1100 TO 1102 1200 TO 1202
_LOWER_BRACING 1400 TO 1413
END GROUP DEFINITION
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.176e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 6.5e-006
DAMP 0.03
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
*GIRDERS*
100 115 116 200 201 216 PRIS AX 0.773 IX 10.509 IY 0.046 YD 9.021 ZD 1.5
101 114 202 215 PRIS AX 1.005 IX 12.28 IY 0.061 YD 9.021 ZD 1.5
102 112 113 203 204 214 PRIS AX 1.189 IX 15.57 IY 0.090 YD 9.021 ZD 1.5
103 104 110 111 205 206 212 213 PRIS AX 1.355 IX 18.59 IY 0.117 YD 9.021 ZD 1.5
105 106 107 108 109 207 208 209 210 211 -
PRIS AX 1.521 IX 21.68 IY 0.143 YD 9.021 ZD 1.5
*STRINGERS*
300 TO 310 400 TO 410 PRIS AX 0.265 IX 0.209 IY 0.01 YD 2.1875 ZD 1.03125
*FLOORBEAMS*
500 TO 502 600 TO 602 700 TO 702 800 TO 802 900 TO 902 1000 TO 1002 -
1100 TO 1102 1200 TO 1202 PRIS AX 0.27 IX 0.494 IY 0.003 YD 3.42 ZD 0.70
*LOWER BRACING*
1400 TO 1413 PRIS AX 0.035 IX 0.0001 IY 0.0001 IZ 0.0001
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
100 300 400 200 PINNED
117 309 409 217 310 311 410 411 FIXED BUT FX MX MZ
MEMBER RELEASE
300 301 302 303 304 305 306 307 308 400 401 402 403 404 405 406 407 408 -
START MZ
308 408 END MZ
DEFINE MOVING LOAD
*286 Kip Cars*
TYPE 1 LOAD 35.75 35.75 35.75 35.75 35.75 35.75 35.75 35.75 35.75 35.75 35.75 -
35.75 35.75 35.75 35.75 35.75 35.75 35.75 35.75 35.75
DIST 5.667 19.583 5.667 6.667 5.667 19.583 5.667 6.667 5.667 19.583 5.667 -
6.667 5.667 19.583 5.667 6.667 5.667 19.583 5.667 WID 5
*315 Kip Cars*
TYPE 2 LOAD 39.375 39.375 39.375 39.375 39.375 39.375 39.375 39.375 39.375 -
39.375 39.375 39.375 39.375 39.375 39.375 39.375 39.375 39.375 39.375 39.375
DIST 6 30.667 6 6.4167 6 30.667 6 6.4167 6 30.667 6 6.4167 6 30.667 6 6.4167 -
6 30.667 6 WID 5
*E80 Cars (NORTH)*
TYPE 3 LOAD 20 40 40 40 40 26 26 26 26 20 40 40 40 40 26 26 26 26 10 20 20 20 -
20 20 20 20 20 20
DIST 8 5 5 5 9 5 6 5 8 8 5 5 5 9 5 6 5 5 5 5 5 5 5 5 5 5 5 WID 5
*E80 Cars (SOUTH)*
TYPE 4 LOAD 20 20 20 20 20 20 20 20 10 26 26 26 26 40 40 40 40 20 26 26 26 26 -
40 40 40 40 20
DIST 5 5 5 5 5 5 5 5 5 5 6 5 9 5 5 5 8 8 5 6 5 9 5 5 5 8 WID 5
*GP40 Cars*
TYPE 5 LOAD 35 35 35 35 35 35 35 35
DIST 9 25 9 16.17 9 25 9 WID 5
*AMTRAK*
TYPE 6 LOAD 34.3 34.3 34.3 34.3 14 14 14 14 13 13 13 13 13 13 13 13 14 14 14 -
14 34.3 34.3 34.3 34.3
DIST 9 34.2083 9 16.083 8.5 51 8.5 17.333 8.5 51 8.5 17.333 8.5 51 8.5 17.333 -
8.5 51 8.5 16.083 9 34.2083 9 WID 5
*SD-70M*
TYPE 7 LOAD 34.165 34.165 34.165 34.165 34.165 34.165 34.165 34.165 34.165 -
34.165 34.165 34.165
DIST 6.67 6.67 47.5 6.67 6.67 13.417 6.67 6.67 47.5 6.67 6.67 WID 5
*LOAD GENERATION 350
*TYPE 1 -190 0 -5.833 XINC 1
*LOAD GENERATION 400
*TYPE 2 -250 0 -5.833 XINC 1
*LOAD GENERATION 305
*TYPE 3 -160 0 -5.833 XINC 1
*LOAD GENERATION 305
*TYPE 4 -160 0 -5.833 XINC 1
*LOAD GENERATION 260
*TYPE 5 -110 0 -5.833 XINC 1
*LOAD GENERATION 620
*TYPE 6 -470 0 -5.833 XINC 1
LOAD GENERATION 350
TYPE 7 -200 0 -5.833 XINC 1
PERFORM ANALYSIS
FINISH