Question 5 of 22 A beam which is composed of concrete and a wide flange steel is subjected to moment M = 1126 kN.m. W ts 2d d ← Econc=4.1 x 104 MPa Est=2.46 x 105 MPa d = 340 mm Ast=24066.667 mm² Ist=1158.409 x 106 mm4 If it is a design requirement that the compressive stresses should only be carried by the concrete, compute the stress at the extreme fiber of steel.
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- Determine the required tension steel area of the T beam with given properties below. Width of flange bf = 500 mm Width of web bw = 340 mm Thickness of flange tf = 140 mm Effective depth d = 350mm Effective concretee covering d' = 75mm Compressive strength of concrete fc' = 34.5 MPa Yield stress of steel bar fy = 375 MPa Mu = 415 kN-m As = _________ mm2The concrete post is reinforced axially with four symmetrically placed steel bars, each of cross-sectional area 900 mm2. Compute the stress in each material when the 1000-kN axial load is applied. The moduli of elasticity are 200 GPa for steel and 14 GPa for concrete. Compatibiltiy Equation . Ust Bearing |1000 kN plate Steel- Concrete 300 mm 300 mm Section a-aIn the reinforced beam having a width of 300mm and an effective depth of 600 mm, caries a moment of 80 KN - m which developed a max. stress of 5 MPa in the concrete. Determine the area of steel reinforcement required if n = 9, What stress is developed in the steel? d-600 b=300 As 200 400 300 nAs 100
- A beam carrying an allowable actual moment of -38 KN- m is reinforced as shown. If the the concrete is normal weight and f'c = 25MPa and fy = 420MPa. Determine the following: a. The cracking moment of the beam. b. The transformed moment of Inertia. c. The actual tension steel stress. d. Check the stress if it is correct by force checks. mm www.009 4-020 О 140 mm 300 mm 170 mm * 170 mm: ww.08 ✓ 60 mmA W 305 x 87, 7.5m llong, is pinned at both ends and braced in the weak direction at the third points. Determine the available compressive strength. Properties: A = 10,965 mm² lx = 331.2x106 mm4 ly = 55.78x106 mm4 •• Please Show Solutions Steel Design: Civil Engineering Answersi Pn=Fer Ag= 274.61 (10965) 1000 Pn=3011.05 KNQuestion 8 1 p The rectangular doubly reinforcement stress concrete block with the arrangement of reinforcement of 2N28 bars on top and 3N28 bars on bottom. The modulus of elasticity are Ec=23,500MPa and Es = 200,000MPa. Dead load is 18KN/m and live load is 12KN/m. f'c = 25MPa 800 TE 730 N12 ligs (fsv.t-500MPa) Ast = 3N28 350 Span = 10m Figure 3 Calculate the concrete stresses in tension and compression of the reinforcement concrete beam shown in Figure 3. Compression concrete stress Choose ] Tension Concrete stress Choose]
- A W18 x 40 floor beam supports a 4-inch-thick reinforced concrete slab with an effective width b of 81 inches. Sufficient anchors are provided to make the beam fully composite. The 28-day compressive strength of the concrete is f,c = 4 ksi. a. Compute the moment of inertia of the transformed section. b. For a positive service load moment of 290 ft-kips, compute the stress at the top of the steel (indicate whether tension or compression), the stress at the bottom of the steel, and the stress at the top of the concrete.3 A concrete floor slab 100 mm thick is cast monolithic with concrete beams 2.0 m on centers. The beams have a span of 4.0 m, web width of 250 mm and overall depth of 500 mm. The tensile reinforcement consists of 6-∅20 mm bars in two rows with 25 mm vertical clear spacing. Use material strengths f’c = 21 MPa and fy = 415 MPa. Calculate the following considering a T-geometry: Effective flange width of an interior beam in mm = ? Depth of uniform stress block at ultimate stage in mm to the nearest whole number = ?? Tensile steel strain compatible with concrete strain of 0.003 in 3 decimal places = ?Problem 6.142 The reinforced concrete beam is made using two steel reinforcing rods. Figure 1 4 in. M of 1 8 in. 6 in. 8 in. 18 in. 2 in. 1-in. diameter rods. Part A If the allowable tensile stress for the steel is (Ost) allow = 36 ksi and the allowable compressive stress for the concrete is (conc) allow = 3.1 ksi, determine the maximum moment M that can be applied to the section. Assume the concrete cannot support a tensile stress. Est = 29 (10³) ksi, Econe = 3.8 (10³) ksi. (Figure 1) M = Submit ΠΑΠ ΑΣΦ ↓↑ vec My Answers Give Up ? Provide Feedback kip.ft Continue
- A rectangular beam has a width of 258mm and an effective depth of 600mm. It is reinforced with 4-36mm bars. The compressive strength of the concrete is 28MPa and the yield strength of the steel is 279MPa. The depth of the concrete stress block is ___ mm.A rectangular beam has a width of 285 mm and an effective depth of 520mm. It is reinforced with 4 – 36 mm ø bars having fy = 430 MPa. If he compressivestrength of the concrete is 28MPa, find the following a. Location of the neutral axis from the top of the beam.b. Stress of the steel.c. Ultimate capacity of the beam?a concrete floor slab 100mm thick is cast monotholic with concrete beams 2.0 m on centers. the beams have a span of 4.0m, web width of 259 mm and overall depth of 50 mm. the tensile reinforcement consists of 6-⌀20 mm bars in two rows with 25mm vertical clear spacing. use material strengths f'c=21MPa and fy=415MPa. calculate the ff considering a T-geometry: 1. effective flange width of an interior beam in mm 2. depth of uniform stress block at ultimate stage in mm to the nearest whole number 3. tensile steel strain compatible strain of 0.003