STAAD pro for steel design?

timer Asked: Nov 21st, 2016

Question description

i need someone professional in STAAD pro programming

Project Description (Fall 2016) Create a model of a ten-story steel frame building in STAAD Pro The plan view is shown below. The building has a regular beam and column arrangement through 10 stories. Story heights are as follows – first three stories are 15 ft, next three stories are 12 ft and the top four stories are 10 ft. The small squares indicate column locations. The columns are identified by the lines A – F and 1 – 5. Thus the column shown shaded would be identified as column C-1 The floor SERVICE LOADS are: Dead Load (representing 4 inch concrete slab) Live Load (reducible as per ASCE7) 45 psf 80 psf The roof SERVICE LOADS are: Dead Load (representing 3 inch roof slab) Live Load Snow Load Rain Load 35 psf 15 psf (ROOF LIVE LOAD) 23 psf 17 psf The wind profile is approximated by a lateral pressure of 10 psf up to a height of 10 ft, 18 psf from 10 ft to 20 ft, 24 psf from 20 ft to 35 ft, 28 psf from 35 to 50 ft and 32 psf upward from 50 ft. The beams and columns are fabricated from A992 steel (Fy = 50 ksi; Fu = 65 ksi) and the floor slabs are 4 inch thick reinforced concrete slabs (fc’ = 3500 psi). THERE IS NO NEED TO INCORPORATE THE CONCRETE SLABS INTO THE MODEL. All members of the frame - Beams and Columns - are W-sections TASK ONE Model the structure (330 nodes, 490 beams and 300 columns) using STAAD PRO; input all primary load cases and LRFD load combinations. Analyze the structure and prepare table of member forces in frame members. LOAD CASES: 1. Dead load (include self weight) 2. Roof Live Load 3. Snow Load 4. Rain Load 5. Live Load 6. North-South Wind (W1) 7. East-West Wind (W2) 8. North-South Seismic. Use the EQDATA time history in STAAD 9. East-West Seismic. Use the EQDATA time history in STAAD LOAD COMBINATIONS: 1. 1.4D 2. 1.2D + 1.6L + 0.5Lr 3. 1.2D + 1.6L + 0.5S 4. 1.2D + 1.6L + 0.5R 5. 1.2D + 1.6Lr + 0.5L 6. 1.2D + 1.6Lr + 0.5W1 7. 1.2D + 1.6Lr + 0.5W2 8. 1.2D + 1.6S + 0.5 L 9. 1.2D + 1.6S + 0.5 W1 10. 1.2D + 1.6S + 0.5 W2 11. 1.2D + 1.6R + 0.5 L 12. 1.2D + 1.6R + 0.5 W1 13. 1.2D + 1.6R + 0.5 W2 14. 1.2D + 1.0 W1 + 0.5 L + 0.5Lr 15. 1.2D + 1.0 W1 + 0.5 L + 0.5S 16. 1.2D + 1.0 W1 + 0.5 L + 0.5R 17. 1.2D + 1.0 W2 + 0.5 L + 0.5Lr 18. 1.2D + 1.0 W2 + 0.5 L + 0.5S 19. 1.2D + 1.0 W2 + 0.5 L + 0.5R 20. 1.2D + 1.0 E + 0.5 L + 0.2S 21. 0.9D + 1.0 W1 22. 0.9D + 1.0 W2 23. 0.9D + 1.0 E TASK TWO Perform steel (LRFD) design using STAAD Pro. Use the following sequence: 1. Perform analysis 2. Select all members 3. Group members. Group all beams from first 5 floors into one group (LOWERBEAMS) and all beams from 6th – 10th floors into one group (UPPERBEAMS). Similarly group all columns from first 5 floors into one group (LOWERCOLUMNS) and all columns from 6th – 10th floors into one group (UPPERCOLUMNS). 4. Perform analysis 5. Select members The final design iteration performed by STAAD will indicate that for each group, the size selection was done based on a particular member (the one with the worst loading). Thus, there will be 4 such members noted – one for each group. Using the interaction equations in Chapter H of the AISC Manual, verify the results indicated by STAAD, using results from the final analysis. YOU NEED TO SHOW THIS DETAILED RESULTS VERIFICATION (4 DIFFERENT MEMBERS) FOR THE MOMENT FRAME ONLY. SINCE THE STEEL GRADE IS A992, YOU WILL BE ABLE TO GET VALUES SUCH AS Lp, Lr, φbMp etc. FROM THE STEEL MANUAL (for Fy = 50 ksi). I ALSO WANT YOU TO DEVELOP A SPREADSHEET TO DO THESE CALCULATIONS IN CASE THE STEEL GRADE IS CHANGED TO 36 ksi (say). Investigate 2 options: 1. Model the frame as a moment frame. Show detailed calculations. 2. Model the frame as a braced frame (choose diagonal bracing in corner bays). Use HSS shapes as brace members. Release the moments at both ends of only the bracing members. Adding braces will increase the total number of members by 160. Comment on the final design for both options. Compare the final outcome of the two designs using typical indicators such as chosen sizes for the various groups, maximum lateral drift (for the wind case) etc. Also, have STAAD-Pro do a quantity take off for each case.
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