Select the least-weight W8 A992 column to carry a dead load of 20 kips and a live load of 50 kips with an effective length about both axes of 25 ft by LRFD and ASD b- if the effective length is 32 ft, select the lightest-weight W12 to support the load by LRFD
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- How much service live load, in kN/m, can be supported? The member weight is the only dead load. The axial compressive load consists of a service dead load of 45 kN 6.2m and a service live load of 90 kN. Do not consider moment amplification. Use NSCP 2015. W460x144 а. LRFD. b. ASD. br te Sy Z,J wt A tw Ix Sx Ty Zx Cw SECTION kN/m mm? mm mm| mm3 mm mm mm3 mm3 mm3 mm mm mm mm mm mm W460x144 1.41 18400 472 13.6 283 22.2 | 726 3080 199 83.6 591 67.4 3450 906 2440 4230STEEL DESIGN PROBLEM: USE AISC MANUAL AND NSCP 2015 FOR REFERENCE. The beams on a terrace are to be designed uniformly at the critical section. After running an analysis, the critical section carries a deadload of 100 kN-m (rounded off to include weight of the beam) and a liveload of 140 KN-m. The beam conditions must be decided. (Consider Flexure ONLY) 1. Design a W14 I-Section whose unbraced length is 9 meters and Cb = 1.0. In designing, limit your Mu/Mcap between 80% to 90% to consider economical value. 2. What if the beam is to braced at the first third point only, Cb=1.0? Determine the ultimate moment capacity of this particular beam. 3. What if the beam is continuously braced wherein Lb=0? Determine the ultimate moment capacity of this particular beam.P3: A simply supported beam has a span of 6 m. If the cross section of the beam is as shown below, f. = 35 MPa, and fy = 420 MPa, determine the allowable uniformly distributed service live load on the beam. "5 min 2-20 F om 400 mm MED 3-32 1-2 250 mm
- How much service live load, in kN/m, can be supported? The member weight is the only dead load. The axial compressive load consists of a service dead load of 45 kN 6.2m and a service live load of 90 kN. Do not consider moment amplification. Use NSCP 2015. W460x144 а. LRFD. b. ASD. bf Sy Z,J wt A tw Ix Sx Ty Zx Cw SECTION kN/m mm? mm mm*| mm3 mm mm mm| mm mm3 mm3 mm mm mm mm mm W460x144 1.41 18400 472 13.6 283 22.2 | 726 3080 199 83.6 | 591 67.4 3450 906 2440 4230Q-An RC square column of size 600 mm is constructed to carry an unfactored load of 3000 kN. The ends of the column are restrained from displacement but free to rotate and is casted with M-25 concrete. The area of Fe-415 steel required to carry the given load considering that the column is short and loaded with minimum eccentricity isPROBLEM 2 How much service live load, in kN/m, can be supported? The member weight is the only dead load. The axial compressive load consists of a service dead load of 45 kN 6.2m and a service live load of 90 kN. Do not consider moment amplification. Use NSCP 2015. W460x144 а. LRFD. b. ASD. d bf Sy wt A tw Sx rx ly ry Zx Zy J Cw SECTION kN/m mm? mm mm mm*| mm3 mm* | mm3 mm3 mm3 mm4 mm mm mm mm mm W460x144 1.41 18400 472 13.6 283 22.2 726 3080 199 83.6 591 67.4 3450 906 2440 4230
- Use NSCP 2015. The beam shown has continuous lateral support of both flanges. The uniform load consisting of 50% dead load and 50% live load. The dead load includes the weight of the beam. Used grade 50 steel. 6 k/ft |--0-0²- -18'-0"- fo 4-6- -6'-0" 1. Considering LRFD. Which of the following most nearly gives the design load Wu? 2. Considering LRFD. Which of the following most nearly gives the maximum negative design moment, Mu in ft-kips? 3. Considering W12x35 beam section, The section is 4. Considering ASD the W12x35 beam section, Which of the following most nearly gives allowable strength in ft-kipsQuestion 9 A simple T-beam with bf-600mm h-500mm hf-100mm, bw-300mm with a span of 3m, reinforced by 5-20mm diameter rebar for tension, 2-20mm diameter rebar for compression is to carry a uniform dead load of 20kN/m and uniform live load of 10kN/m. Assuming fe'-21Mpa, fy-415Mpa, d'-60mm, cc-40m and stirrups-10mm, Calculate the cracking moment: Question 10 A concrete one-way slab has a total thickness of 120 mm. The slab will be reinforced with 12-mm-diameter bars with fy - 275 MPa, fc-21 MPa. Determine the area of rebar in mm'if the total factored moment acting on 1-m width of slab is 23 kN-m width of slab is 23 kN-m. Clear concrete cover is 20 mm.A W540x150 simply supported beam 8 m long is to be loaded by a triangulardistributed load that linearly increases from zero at the left end to 20 kN/m(dead) at the right end + a uniformly distributed load of 35 kN/m (live)throughout its entire span + its self-weight. It is braced laterally at the endsupports. Use LRFD Provisions of NSCP 2015. Use Fy = 345 MPa. A.) Which segment of the beam will likely govern its moment capacity, andwhat is the corresponding lateral-torsional buckling modification factor, Cb? B.) What is the ultimate moment capacity of the beam, in kN-m?
- 5-17. A 24 ft axially loaded W12 x 96 column that has the bracing and end support condi- tions shown in the figure. 10 ft Determine: a.) LFRD design strength b.) ASD allowable strength 24 ft 14 ft х-х ахis У-у ахis FIGURE P5-1757 : Design a T-beam having cross section shown in figure below according to ACI code requirement. The beam is simply supported on span 1914 of (7.31m), The is subjected to service dead load (48.80 kN/mm) (including self-weight), and service live load (25 kN.m), Assume the designer intends dnes to use: fe-21 MPa, fy=414 MPa and bf= 1 m. Use two layer of reinforcement) at lan COSM 0.09mm RÝM OC ¹0.3 m² 1000 -0.55 mA built up l-section has a total unsupported length of 6m. It is made up of 2 - 400mm x 12mm plates as flanges and 450mm x 12 mm plate as web. The plates are of Grade 40 steel (fy = 276MPa). Considering the local buckling of the stiffened and unstiffened slender elements, determine the ultimate axial load capacity of the built-up column for both LRFD and ASD. Use NSCP 2015 Specification and effective length factor k = 1.0. Properties of the built-up section: A = 15,000 mm² ly = 128.06 x 106 mm4 Ix = 6.035 x 108 mm4 rx = 200.58 mm ry = 92.40 mm What is the Slenderness Ratio? KL/r Using LRFD, what is the ultimate load capacity of the column? Express your answer in KN Using ASD, what is the allowable load capacity of the column? Express your answer in KN