Structural Steel Design (6th Edition)
6th Edition
ISBN: 9780134589657
Author: Jack C. McCormac, Stephen F. Csernak
Publisher: PEARSON
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Chapter 2, Problem 2.2PFS
To determine
To find: maximum combined load for LRFD for given loading
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2. Load Tracing
For the load-tracing problem below, construct a series of FBDs and show the
propagation of loads through the various structural elements. Determine the column
loads assuming:
DL (decking, flooring, etc.) = 10 psf
LL (occupancy) = 40 psf
Beam B-2 spans between girder G-3 and column B-2 and beam B-3 spans between
girder G-3 and column C-2.
A
B
D
101
101
101
GI
OPEN DECKING
B-2
'DECKING·
M
B
B-3
43
G2
TYPICAL FLOOR FRAMING
Compute the maximum combined loads using the recommended ASDexpressions from the AISC.
D = 25 psf, Lr = 20 psf and W = ;26 psf
For Probs 2-4 determine the maximum combined loads using the recommendedASIC expressions for LRFD.
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- Determine the maximum combined loads using the recommendedAISC expressions for LRFD. D = 9000 lb, L = 5000 lb, Lr = 2500 lb, E = ;6500 lb (Ans. 20,050 lb)arrow_forwardDiscuss about Load Combinations for LRFDarrow_forward3. Load Tracing Determine the Columns loads assuming: DL (decking, flooring, etc.) = 30 psf LL (occupancy) = 50 psf Total Load = 80 psf 2 10⁰ A loi GI OPEN 7B-270 DECKING DECKING B-3 D 4-3 G2 TYPICAL FLOOR FRAMINGarrow_forward
- Compute the maximum combined loads USING THE RECOMMENDED ASD EXPRESSIONS FROM THE AISC. D = 900 lb L = 500 lb Lr = 2500 lb E = ±6500 lbarrow_forward8.9 The following table shows the design dead and live loads for the lowest four stories of a 18" square reinforced concrete column. a) Calculate the column factored loads. (Note: these loads are cumulative and included the loads from the levels above) Table Column design loads Story 4 3 2 1 Dead (kip) 250 350 450 550 Reduced Live (kip) 110 160 200 250 Factored load (kip) b) Assume 8-#11vertical bars are used at the first story. Draw column cross-section at 1"=1'-0" scale; show column overall dimensions, transverse ties, and vertical reinforcing bars. c) Verify that 8-#11 vertical bars meet the minimum and maximum steel area requirements for columns. 0.01 Agarrow_forwardDetermine the number of a glulam column 3.0 m in length that support an axial load of 120 kN. The column is to be built with 35mm thick and 200mm wide laminations of Yakal lumber (E = 9.78 GPa, Fc = 15.8 MPa). Assume a normal load duration, wet service condition and fixed-end connection with lateral support at both ends.arrow_forwardCalculate the factored load using LRFD load combinations 1. Dead Load: Superimposed DL: 20 PSF plus Self-Weight TBD 2. Roof Dead Load: Superimposed DL: 10 PSF plus Self-Weight TBD 3. Live Load: First Level: 250 PSF (Assume no live load reduction.) 4. Live Load: Second Level: 100 PSF (Assume no live load reduction.) 5. Roof Live Load: 20 PSF 6. Snow Load: 25 PSF (Assume no drifting of snow) 7. Rain Load: 6-inches of standing rainwater (assume that roof drainage plan and scupper size and spacing will allow up to 6-inches of standing water on the roof during a 1-hour, 100-year storm event.) 8. Wind Load: In lieu of determining wind loading from the ASCE/SEI 7-16 wind procedure, assume a uniform wind loading of 25 PSF on the windward face of the building and 5 PSF of uniform wind loading on the leeward face (a negative (or suction effect) loading). On the roof, assume that downward wind loading will not govern on the roof, but check the roof for an uplift loading of 15 PSF of wind…arrow_forwardNeed to consider the live load reductionarrow_forwardNote: please use Set B data thank you 2° M₂ A B * 4 m 2m The cantilever beam above is made up of concrete with E- 70 MPa, refer to the table below for the properties and loads for the beam: PROPERTIES LOADS SET b (mm) h (mm) w (kN/m) Mb (kN-m) A (1,3,5,7,9) 300 500 20 40 B (2,4,6,8,0) 250 400 15 45 Using area moment method, determine the following: Flexural rigidity of the beam in N-men²arrow_forwardThe concrete girders shown in the photo of the passenger car park- ing garage span 30 ft and are 15 ft on center. If the floor slab is 5 in. thick and made of reinforced stone concrete, and the specified live load is 50 lb/ft? (see Table 1–4), determine the distributed load the floor system transmits to each interior girder. TABLE 1-4 Minimum Live Loads* Live Load Live Load Occupancy or Use psf kN/m? Occupancy or Use psf kN/m? Assembly areas and theaters Fixed seats Movable seats Residential 60 2.87 Dwellings (one- and two-family) Hotels and multifamily houses 40 1.92 100 4.79 Garages (passenger cars only) 50 Office buildings Lobbies 2.40 Private rooms and corridors 40 1.92 Public rooms and corridors Schools Classrooms Corridors above first floor 100 4.79 100 4.79 Offices 50 2.40 40 1.92 Storage warehouse Light Нeavy 80 3.83 125 6.00 11.97 250 *Reproduced with permission from Minimum Design Loads for Buildings and Other Structures, ASCE/SEI 7-10.arrow_forwardDetermine the maximum combined loads using the recommendedAISC expressions for LRFD. D = 100 psf, L = 70 psf, R = 12 psf, Lr = 20 psf and S = 30 psfarrow_forwardPlease redo it again with the following loads, The loads consists of a uniformly dostributed dead load(including self weight) of 3k/ft, uniformly distributed live load of 6k/ft and a concentrated live load of 10k at the midspan.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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