For the singly-reinforced section (Section A), compute the area
of steel corresponding to balanced conditions, As(bal).
Homework Answers
Answer: Area of Steel for the given singly reinforced section is 6113.7688 mm²
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For the singly-reinforced section (Section A), compute the area
of steel corresponding to balanced conditions, As(bal)....
Reinforced concrete 2 For the section in Problem i) determine the area of steel such that...
Reinforced concrete
2 For the section in Problem i) determine the area of steel such that the depth of the equivalent rectangular concrete stress distribution (block) is 4", and ii) determine the nominal moment strength and capacity if the steel area is 25% higher than balanced steel condition. Assume d 23.5", f.-3,000 psi, and f 60,000 psi. Hole 5-88 8 16
For the same singly-reinforced (reinforcement in tension only) concrete section used in Homework 3, we want...
For the same singly-reinforced (reinforcement in tension only) concrete section used in Homework 3, we want to investigate the impact of using a parabolic semi-segment for the shape of the concrete stress-strain curve in the determination of the ultimate capacity of the beam. Note that steel stress-strain behavior will be modeled using elasto-plastic model. The properties of the materials are s"-4500 psi for the concrete and Jy -60 ksi for the reinforcement. Using this type of behavior leads to the...
10. A beam cross-section is limited to the size shown below. Determine the required area of...
10. A beam cross-section is limited to the size shown below. Determine the required area of reinforcement for service load moments Mp-430 ft-kip and M 175 ft-ki ksi. Note that the beam self weight is already included in the dead load moment. Assume that c 0.6c for the singly-reinforced part of the section (for your initial guess). Hint: first calculate the nominal moment resisted by the concrete section without compression steel. Check the strength only p.f -4,000 psi and f,-60...
Problem 2. A concrete beam is reinforced by three steel rebars placed as shown. The modulus...
Problem 2. A concrete beam is reinforced by three steel rebars placed as shown. The modulus of elasticity is 3x106 psi for concrete and 29x106 psi for steel. Find the tensile stress in rebars and maximum compressive stress in concrete under an external bending moment of (a) 80 kip.in and (b) 240 kip.in. Given the compressive strength of concrete fe' = 3 ksi and yield stress of rebars fy = 60 ksi, discuss the state of crack in concrete and...
Determine for the doubly reinforced cross section. Assume Grade 60 steel with f, 3,500 psi. Be...
Determine for the doubly reinforced cross section. Assume Grade 60 steel with f, 3,500 psi. Be sure to check the strain in the tension steel. 3" 3" 4#6 10" 32" 8" 4" 4" 8#9 1I
2. A singly reinforced rectangular section having a cross-section b 300 mm and d = 600...
2. A singly reinforced rectangular section having a cross-section b 300 mm and d = 600 mm is reinforced by 10 N32 bars. Assuming f: = 32 MPa, compute the reliable moment capacity of the section (i.e. OMU).
HELP! Problem 6 Development Length (30 pts.) The required reinforcement steel area "As" for the lightweight reinforced concrete beam of figure 3 is 2.88 si. The No. 8 top bars are uncoated. C...
HELP!
Problem 6 Development Length (30 pts.) The required reinforcement steel area "As" for the lightweight reinforced concrete beam of figure 3 is 2.88 si. The No. 8 top bars are uncoated. Compute the development length (d), İffy 60,000 psi and fc 3.500 psi. a) Use the simplified equation Table 8-1) b) Use the ACI Equation 25.4.2.3a (Equation 8-10) c) Use the ACI Equation 25.4.2.3a with Ktr 0 (Equation 8-10) 18 3" 3@4 123 3" 448 bars 3.14 in2 26...
Problem 2 Determine the nominal moment capacity for the reinforced concrete beam shown. The beam ...
Problem 2 Determine the nominal moment capacity for the reinforced concrete beam shown. The beam cross section has a width 10 inch and a depth 20 inch. The beam is reinforced with a tension steel reinforcement of 3#8 with an area of steel # 2.37 inch Assume grade 60 steel with a yield strss, Fy 60 ksi d 20 3#8 2.37/ 2 As B-10"
Problem 2 Determine the nominal moment capacity for the reinforced concrete beam shown. The beam cross...
2. (35 points) Initially assuming that the moment arm is 0.9d, determine the area of steel...
2. (35 points) Initially assuming that the moment arm is 0.9d, determine the area of steel required for the beam shown to support a nominal moment of My = 270 kip. ft. After selecting the bars, show that the flexural capacity of the section is sufficient. Use fy = 60 000 psi, and f' = 4500 psi. 18 in 15 in
2. A redwood timber member w/ a 20 inch square cross section is reinforced w/ an ASTM structural ...
2. A redwood timber member w/ a 20 inch square cross section is
reinforced w/ an ASTM structural steel Angle (L6 x 6 x 1) at each
corner as shown. The materials are so attached as to act as a
single unit. Compute the total allowable axial compressive load
that may be applied through a rigid cap plate that covers the
entire cross-sectional area. Use dressed dimensions and assume the
materials have the same length. The allowable compressive stress is...
Reinforced concrete
2 For the section in Problem i) determine the area of steel such that the depth of the equivalent rectangular concrete stress distribution (block) is 4", and ii) determine the nominal moment strength and capacity if the steel area is 25% higher than balanced steel condition. Assume d 23.5", f.-3,000 psi, and f 60,000 psi. Hole 5-88 8 16
For the same singly-reinforced (reinforcement in tension only) concrete section used in Homework 3, we want to investigate the impact of using a parabolic semi-segment for the shape of the concrete stress-strain curve in the determination of the ultimate capacity of the beam. Note that steel stress-strain behavior will be modeled using elasto-plastic model. The properties of the materials are s"-4500 psi for the concrete and Jy -60 ksi for the reinforcement. Using this type of behavior leads to the...
10. A beam cross-section is limited to the size shown below. Determine the required area of reinforcement for service load moments Mp-430 ft-kip and M 175 ft-ki ksi. Note that the beam self weight is already included in the dead load moment. Assume that c 0.6c for the singly-reinforced part of the section (for your initial guess). Hint: first calculate the nominal moment resisted by the concrete section without compression steel. Check the strength only p.f -4,000 psi and f,-60...
Problem 2. A concrete beam is reinforced by three steel rebars placed as shown. The modulus of elasticity is 3x106 psi for concrete and 29x106 psi for steel. Find the tensile stress in rebars and maximum compressive stress in concrete under an external bending moment of (a) 80 kip.in and (b) 240 kip.in. Given the compressive strength of concrete fe' = 3 ksi and yield stress of rebars fy = 60 ksi, discuss the state of crack in concrete and...
Determine for the doubly reinforced cross section. Assume Grade 60 steel with f, 3,500 psi. Be sure to check the strain in the tension steel. 3" 3" 4#6 10" 32" 8" 4" 4" 8#9 1I
2. A singly reinforced rectangular section having a cross-section b 300 mm and d = 600 mm is reinforced by 10 N32 bars. Assuming f: = 32 MPa, compute the reliable moment capacity of the section (i.e. OMU).
HELP!
Problem 6 Development Length (30 pts.) The required reinforcement steel area "As" for the lightweight reinforced concrete beam of figure 3 is 2.88 si. The No. 8 top bars are uncoated. Compute the development length (d), İffy 60,000 psi and fc 3.500 psi. a) Use the simplified equation Table 8-1) b) Use the ACI Equation 25.4.2.3a (Equation 8-10) c) Use the ACI Equation 25.4.2.3a with Ktr 0 (Equation 8-10) 18 3" 3@4 123 3" 448 bars 3.14 in2 26...
Problem 2 Determine the nominal moment capacity for the reinforced concrete beam shown. The beam cross section has a width 10 inch and a depth 20 inch. The beam is reinforced with a tension steel reinforcement of 3#8 with an area of steel # 2.37 inch Assume grade 60 steel with a yield strss, Fy 60 ksi d 20 3#8 2.37/ 2 As B-10"
Problem 2 Determine the nominal moment capacity for the reinforced concrete beam shown. The beam cross...
2. (35 points) Initially assuming that the moment arm is 0.9d, determine the area of steel required for the beam shown to support a nominal moment of My = 270 kip. ft. After selecting the bars, show that the flexural capacity of the section is sufficient. Use fy = 60 000 psi, and f' = 4500 psi. 18 in 15 in
2. A redwood timber member w/ a 20 inch square cross section is
reinforced w/ an ASTM structural steel Angle (L6 x 6 x 1) at each
corner as shown. The materials are so attached as to act as a
single unit. Compute the total allowable axial compressive load
that may be applied through a rigid cap plate that covers the
entire cross-sectional area. Use dressed dimensions and assume the
materials have the same length. The allowable compressive stress is...
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