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2. Figure Q.2 shows the section of a symmetrical prestressed concrete beam in which the eccentricity...
2. Figure Q.2 shows the section of a symmetrical prestressed concrete beam in which the eccentricity...
2. Figure Q.2 shows the section of a symmetrical prestressed concrete beam in which the eccentricity of the tendons is e mm, the cross-section area is A x 10' (mm2), and the 2d moment of area about x-x axis is Lu 10 (mm). (50%) Figure Q.2 e106.1 mm xx 1611 240 a. Calculate the maximum allowable prestressing force if, at the prestressing stage, the allowable stresses are 1 N/mm2 tension and 20 N/mn2 compression. What applied moment can then be...
e = 108.3 mm A = 10 Ixx = 162.2 2. Figure Q.2 shows the section of a symmetrical prestressed concrete beam in which the eccentricity of the tendons is e mm, the cross-section area is A x 10 (mm',...
e = 108.3 mm
A = 10
Ixx = 162.2
2. Figure Q.2 shows the section of a symmetrical prestressed concrete beam in which the eccentricity of the tendons is e mm, the cross-section area is A x 10 (mm', and the 2d moment of area about x-x axis is Iux x 10' (mm). (50%) Figure Q.2 240 Calculate the maximum allowable prestressing force if, at the prestressing stage, the allowable stresses are 1 N/mm2 tension and 20 N/mn2 compression....
plz make sure..... EXAMPLE 4.1 Consider a concrete beam of rectangular section, 150 mm wide by...
plz make sure.....
EXAMPLE 4.1 Consider a concrete beam of rectangular section, 150 mm wide by 300 mm deep, prestressed by 4 high-tensile wires of 5 mm diameter stressed to 1200 N/mmº. The wires are located at an eccentricity of 50 mm. The stresses developed at the soffit of the beam will be examined by considering the nominal concrete and 'equivalent concrete section. Prestressing force = (1200 x 80) = 96,000 N. For the nominal concrete section, A = 45,000...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables,...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables, each with a cross sectional area of 50mm², initial stress of 1200N/mm². Calculate the stress in concrete at level of steel? 2. A pre tensioned concrete beam 100mm wide and 300mm deep, initial force of 150kN at an eccentricity of 50mm, moment of inertia is 225*10mm, initial stress in steel is 400N/mm², modular ratio is 8. Estimate the percentage loss? 3. A pretensioned concrete...
3) (35 pts) A L-beam has the cross section shown. A moment M acts about the...
3) (35 pts) A L-beam has the cross section shown. A moment M acts about the x-axis which passes through the centroid of the section. Determine the angle the neutral axis makes with respect to axis. Sketch it on the cross section. Given the design flexural stress limit is 100 MPa, determine the maximum allowable moment which can be applied. You only need to evaluate the stresses at points A, B. Helpful hint: Remember to change the sign of your...
FIGURE Q2 shows cross-section of a rectangular doubly reinforced concrete beam. The concrete grade, fck is...
FIGURE Q2 shows cross-section of a rectangular doubly reinforced concrete beam. The concrete grade, fck is 20 N/mm2 and the steel grade, fyk is 500 N/mm2. Evaluate whether the beam has been designed as under reinforced section AND also determine if the section is able to resist an applied moment of 75 kN.m. [10 marks] 30 mm T 3H10 300 mm 5H12 30 mm 100 mm FIGURE Q2
03(a) A reinforced concrete beam is acted on by a positive bending moment. reinforcement consists of 4 bars of 28 mm diameter. The modulus of elasticity is E 25 GPa for the concrete and E-200 G...
03(a) A reinforced concrete beam is acted on by a positive bending moment. reinforcement consists of 4 bars of 28 mm diameter. The modulus of elasticity is E 25 GPa for the concrete and E-200 GPa for the steel. The allowable stresses for the concrete and steel are ơ.-9.2 MPa and ơ.-135 MPa, respectively. Determine the maximum permissible positive bending moment. (10 marks) 625 mm 4 bars 28 mm -300 mm Figure Q3(a) 03(b) A simply supported beam that is...
Problem 2 A reinforced concrete beam (see fig.) is acted on by a positive bending moment...
Problem 2 A reinforced concrete beam (see fig.) is acted on by a positive bending moment of M - 160 kNm. Steel reinforcement consists of 4 bars of 28-mm diameter. The modulus of elasticity for the concrete is E = 25 GPa while that of the steel is E, = 200 GPa. (a) Find the maximum stresses in steel and concrete. (b) If allowable stresses for concrete and steel are = 9.2 MPa and 0 -135 MPa, respectively, what is...
1. A cross section of a RC beam is described in a below figure. Three No....
1. A cross section of a RC beam is described in a below figure. Three No. 29 reinforcing bars are located at the bottom of the section. The area of a #29 reinforcing bar is 645 mm2 while the yield strength of the steel bar is 420 MPa. The tensile strength of concrete is 2.7 MPa, and the compressive strength of concrete is 21 MPa. In addition, n= E/Eis selected as 8. (1) Compute the maximum compressive and tensile stresses...
Q. 2 For the beam section shown in Figure Q. 2 (a), determine: (25 marks) (a)...
Q. 2 For the beam section shown in Figure Q. 2 (a), determine: (25 marks) (a) The depth to the neutral axis of bending. (3 marks) (b) The second moment of area of the section about that neutral axis. (5 marks) If section is to be used as a beam with an overhang shown in Figure Q. 2 (b), determine: (c) The maximum tensile and compressive bending stresses that develop in the beam. (10 marks) (d) The maximum shear stress...
2. Figure Q.2 shows the section of a symmetrical prestressed concrete beam in which the eccentricity of the tendons is e mm, the cross-section area is A x 10' (mm2), and the 2d moment of area about x-x axis is Lu 10 (mm). (50%) Figure Q.2 e106.1 mm xx 1611 240 a. Calculate the maximum allowable prestressing force if, at the prestressing stage, the allowable stresses are 1 N/mm2 tension and 20 N/mn2 compression. What applied moment can then be...
e = 108.3 mm
A = 10
Ixx = 162.2
2. Figure Q.2 shows the section of a symmetrical prestressed concrete beam in which the eccentricity of the tendons is e mm, the cross-section area is A x 10 (mm', and the 2d moment of area about x-x axis is Iux x 10' (mm). (50%) Figure Q.2 240 Calculate the maximum allowable prestressing force if, at the prestressing stage, the allowable stresses are 1 N/mm2 tension and 20 N/mn2 compression....
plz make sure.....
EXAMPLE 4.1 Consider a concrete beam of rectangular section, 150 mm wide by 300 mm deep, prestressed by 4 high-tensile wires of 5 mm diameter stressed to 1200 N/mmº. The wires are located at an eccentricity of 50 mm. The stresses developed at the soffit of the beam will be examined by considering the nominal concrete and 'equivalent concrete section. Prestressing force = (1200 x 80) = 96,000 N. For the nominal concrete section, A = 45,000...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables, each with a cross sectional area of 50mm², initial stress of 1200N/mm². Calculate the stress in concrete at level of steel? 2. A pre tensioned concrete beam 100mm wide and 300mm deep, initial force of 150kN at an eccentricity of 50mm, moment of inertia is 225*10mm, initial stress in steel is 400N/mm², modular ratio is 8. Estimate the percentage loss? 3. A pretensioned concrete...
3) (35 pts) A L-beam has the cross section shown. A moment M acts about the x-axis which passes through the centroid of the section. Determine the angle the neutral axis makes with respect to axis. Sketch it on the cross section. Given the design flexural stress limit is 100 MPa, determine the maximum allowable moment which can be applied. You only need to evaluate the stresses at points A, B. Helpful hint: Remember to change the sign of your...
FIGURE Q2 shows cross-section of a rectangular doubly reinforced concrete beam. The concrete grade, fck is 20 N/mm2 and the steel grade, fyk is 500 N/mm2. Evaluate whether the beam has been designed as under reinforced section AND also determine if the section is able to resist an applied moment of 75 kN.m. [10 marks] 30 mm T 3H10 300 mm 5H12 30 mm 100 mm FIGURE Q2
03(a) A reinforced concrete beam is acted on by a positive bending moment. reinforcement consists of 4 bars of 28 mm diameter. The modulus of elasticity is E 25 GPa for the concrete and E-200 GPa for the steel. The allowable stresses for the concrete and steel are ơ.-9.2 MPa and ơ.-135 MPa, respectively. Determine the maximum permissible positive bending moment. (10 marks) 625 mm 4 bars 28 mm -300 mm Figure Q3(a) 03(b) A simply supported beam that is...
Problem 2 A reinforced concrete beam (see fig.) is acted on by a positive bending moment of M - 160 kNm. Steel reinforcement consists of 4 bars of 28-mm diameter. The modulus of elasticity for the concrete is E = 25 GPa while that of the steel is E, = 200 GPa. (a) Find the maximum stresses in steel and concrete. (b) If allowable stresses for concrete and steel are = 9.2 MPa and 0 -135 MPa, respectively, what is...
1. A cross section of a RC beam is described in a below figure. Three No. 29 reinforcing bars are located at the bottom of the section. The area of a #29 reinforcing bar is 645 mm2 while the yield strength of the steel bar is 420 MPa. The tensile strength of concrete is 2.7 MPa, and the compressive strength of concrete is 21 MPa. In addition, n= E/Eis selected as 8. (1) Compute the maximum compressive and tensile stresses...
Q. 2 For the beam section shown in Figure Q. 2 (a), determine: (25 marks) (a) The depth to the neutral axis of bending. (3 marks) (b) The second moment of area of the section about that neutral axis. (5 marks) If section is to be used as a beam with an overhang shown in Figure Q. 2 (b), determine: (c) The maximum tensile and compressive bending stresses that develop in the beam. (10 marks) (d) The maximum shear stress...
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