he T-beam has the following properties: flange thickness = 110 mm flange width = 700 mm web width = 400 mm web height = 250 mm f'c = 28 Mpa a) Calculate the stresses in concrete at uncracked stage under 100 kN-m. b) Calculate the cracking moment. c) Determine the balanced steel area and balanced ultimate moment. The steel is placed 80 mm from its cg up to extreme fiber with yield strength o

he T-beam has the following properties: flange thickness = 110 mm flange width = 700 mm web width = 400 mm web height = 250 mm f'c = 28 Mpa a) Calculate the stresses in concrete at uncracked stage under 100 kN-m. b) Calculate the cracking moment. c) Determine the balanced steel area and balanced ultimate moment. The steel is placed 80 mm from its cg up to extreme fiber with yield strength o

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.7P: Estimate the transverse tensile strength of the concrete in Problem 12.6.

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The T-beam has the following properties: flange thickness = 125 mm flange width = 1000 mm web width = 500 mm web height = 350 mm f'c = 28 Mpa a) Calculate the stresses in concrete at uncracked stage under 200 kN-m. b) Calculate the cracking moment. c) Determine the balanced steel area and balanced ultimate moment. The steel is placed 80 mm from its cg up to extreme fiber with yield strength of 414 MPa.
A singly reinforced rectangular section has a width of 250mm and an effective depth of 460mm. The concrete has a compressive strength of 21MPa. The steel has a yield strength of 275 MPa and E = 200,000 MPa. Calculate the ideal flexural strength for the following areas of steel: a. 2580 mm² b. 5160 mm² c. The value at balanced failure
A pre-tensioned concrete member of section 200 mm x 250 mm contains tendons of area 500 mm2 at centre of gravity of the section. The pre-stress in the tendons is 1000 N/mm2.- Assuming modular ratio as 10, the stress (N/mm2) in concrete is
Assuming concrete is uncracked. Compute the bending stress in the extreme fiber of the beam of figure for bending moment 1x10°kg cm . Determine the cracking moment of the section. A = 10cm² %3D E, = 2*10°kg / cm² E = 2*10°kg / cm² %3D %3D f'. =1836kg / cm² %3D 90 cm 100 cm 40 cm
Assuming the concrete is uncracked, compute the flexure stresses in the extreme fibers of the beam as shown in the figure for a bending moment of 34 kN-m. The concrete has an f' of 27.60 MPa; determine also the cracking moment of the section. (Use 0.62 1 = 0.70 in calculating the modulus of rupture). Dimensions are in millimeter. 380 455 3 #9 bars (A, = 3.00 in.2) 75 300
c) Find the stresses in the concrete and the reinforcement for the following applied moments: (i) – M1= 35kN.m and (ii) – 120kN.m Cross-section: width height Modulus of elasticity: concrete reinforcement Reinforcement: depth area b:= 300-mm h := 520-mm Ec:= 30-GPa Es:= 200-GPa d:= 460-mm As 1470-mm 2 h d b
A pretensioned member with a dimension of 250mm x 360mm is subject to an eccentric tendon that is located 105mm from the soffit. Area of the prestressing steel to be 502 sq. mm and the modulus of elasticity is 200 GPa. The Modulus of elasticity of concrete is 36.8 GPa. Creep coefficient = 1.6 and the shrinkage strain = 3 x10^6. Assume a 5% steel relaxation. Find the total prestressed loss in percentage.
SIT. B: Determine the tensile steel ratio of a given conditions if concrete strength f'. = 28 MPa and steel yield strength fy 4. if the tensile strain is Es = fy/Es upon crushing of concrete at a strain of 0.003. C. 0.02833 A. 0.01567 B. 0.02161 D. 0.02125 if the tensile strain is limited to 0.004 upon crushing of concrete at a strain of 0.003. A. 0.01567 B. 0.01548 5. 6. Minimum as required by NSCP 2015. C. 0.00313 D. 0.00405 A. 0.00333 B. 0.00276 = 420 MPa. C. 0.02778 D. 0.02064 uniformly
* The Dn value for a low relaxation steel is ______. * Determine the elastic shortening loss of a pretensioned concrete, in percentage (simply supported L=15m, H=900mm, B=300mm) given that, fpi=1100MPa, f'ci=40MPa, Eps=200GPa, and the total area of the straight profile tendons is 140 sq.mm.
fc = 25 mpa, fy = 414 the tensile stress is in the concrete is?
Question 2A composite bar is made up of a steel strip 2 mm thick and 12 mm wide, sandwichedbetween two aluminium strips each 3 mm thick and 12 mm wide. The three strips areheld together by two rivets of 5 mm diameter each.2.1 Make a neat detailed sketch of the assembly.2.2 If the three strips are fastened together at 15 0C, determine the shear stress set up inthe rivets when the temperature is raised to 21 0C.Note: The resistance of a rivet in double shear may be taken as 1.75 times the resistancein single shear.(For steel: E = 200 GPa and α = 11×10 -6/ 0C)(For aluminium: E = 70 GPa and α = 22×10-6/0C)
A rectangular pretensioned beam has concentric prestress force of 1000 KN. The beam is 300 x 500 mm in dimension and M20 grade of concrete is used with creep coefficient of 1.6 and residual shrinkage strain of 3 x10-4. Ast = 500 sq.mm. Find the following: a. Loss due to elastic shortening use Est = 200 GPa and Ec = 5700(Fc)^1/2 b. Loss due to creep c. Loss due to shrinkage d. Total loss of prestress