Design a reinforced concrete beam to carry a service live load of 20kN/m and dead load of 15kN/m ( including its own weight) Use f'. : 21MPA, fy only. = 345MPA, b = d/2. The beam is to be reinforced in tension Wu A B -8 m- -8 m- E = 70 GPa 1= 1,300 (106) mm
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- 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 800 730 N12 ligs (fx.t-500MPa) Ast = 3N28 350 Span = 10m Figure 3 Use the Transformed section approach considering the presence of steel. Calculate the concrete area and transformed steel area in both tension and compression shown in Figure 3. n=Es/Ec Ast=1232mm^2 Use n-1 for the transformed area to do the calculate. Unit: mm^2 with two decimalQuestion 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]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' = 25MPa 800 IDE 730 N12 ligs (fsv.f-500MPa) Ast = 3N28 350 Span = 10m Figure 3 Calculate the combination load for the reinforcement concrete beam shown in Figure 3. Unit: KN/m with two decimal. 1.2G+1.5Q=w
- * TRUTT 50 kN/m 8m TIZI SLAB THICKNESS 150mm 2500 mm fe'= 21 MPa fy = 414 тра Cc = 40mm spacer barp=25mm Say bw= 0.6h DESIGN THE T-BEAM AND SHOW THAT TENSION STEEL YIELDS AND THE BEAM IS TENSION CONTROLLED6- For a simply supported beam with b=300 mm and d=500 mm, if f = 63MPa, f, = 280 MPa and the net tensile strain is greater than 0.005, then the maximum steel ratio equal............ (a) 0.0406 (b) 0.0310 (c) 0.0287 (d) 0.0180 (e) None*4-36. The composite bar consists of a 20-mm-diameter A-36 steel segment AB and 50-mm-diameter red brass C83400 end segments DA and CB. Determine the average normal stress in each segment due to the applied load. Esteel l = 200 x10 Pa. EBrass = 101 K109h. |-250 mm-- 500 mm -250 mm- 50 mm 20 mm 75 kN 100 kN D A 75 kN 100 kN В C
- A 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 KNGIVEN: Solid alumınum bar shown: 4 in. by4 in. E = 10 x 10° psi oy = 36 ksi 4000 2000 1b 4000 16 B 12' REQ’D: A) Load in each section of the bar (state whether C or T) PAB = Pac PCD = B) Maximum axial stress in the bar. In which section does this occur? C) Final length of the barA 300 mm X 500 mm exterior beam is reinforced with 25 mm main bars and 12 mm stirrups. The tension side has a steel area of 2450 mm² and the compression side has a steel area of 1480 mm². 60% of the tension steel area is laid out on the first layer, the remaining is on the second layer and the compression steels are on a single layer. Determine the following if the steel yield strength of the compression steel is 276 MPa, the steel yield strength of the tension steel is 415 MPa and the depth of the tension zone 340 mm: a. The compressive stress in the concrete. b. The net tensile stress. c. Ultimate Moment Capacity of the beam.
- 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 - ø20 mm bars in two rows with 25 mm vertical clear spacing. Use material strength 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 neares whole number = _______ Tensile steel strain compatible with concrete strain of 0.003 in 3 decimal places = __________Problem 3: Find the design moment strength for the following section: f'e = 6000 psi hf=6" T a. Mn = fy =60 ksi Es = 29,000 ksi b = 24" 8" bw = 4" bw=4" k-ft A's = 2 in² As = 6.5 in² (total) d` = 1.5" d = 30" Strain StressA beam cast monolithically has the following properties: bf=1200mm, t or hf = 110mm, bw=380mm and h=800mm. It is reinforced with 10D32mm grade 420MPa bars. Concrete strength is assumed to be 27.5MPa and the centroid of tension reinforcement is located 665mm from the outermost compression fiber. A. Determine maximum nominal moment to ensure tension controlled, kN-m. B. Calculate the balanced steel area, mm2. C. Calculate the balanced moment in kN-m.