functions
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Q: -160 40 160 Dimensions 40 in mm 40 -160- –160-
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1. Caused by what is the shear force?
2. The shear force is resisted by what reinforcement?
3. In which area does the shearing force usually occur in the beam?
4. What are the functions of stirrup reinforcement?
5. What conditions must be met if the stirrups are used to resist shear forces?
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- What is the shear strength reduction factor, ϕ, for a beam with tied transverse reinforcement and net tensile strain, εt=0.00346 in the longitudinal tension reinforcement (Grade 60)?Designers typically specify longitudinal reinforcement on all four sides of a square column cross section for which of the following reasons? Check all that apply. a. Bending moments can act about two section axes, not just one b.There is less chance for steel placement mistakes during construction c. There is additional axial strength compared to a design with longitudinal steel on only two sidesHow does the strength changes in multiple axis load?
- A singly reinforced beam will be provided with the reinforcing bars corresponding to 90% of the maximum reinforcement ratio specified in the ACI Code for a tension-controlled (i.e., underreinforced) design. The materials used have the following properties: ??′ = 4000 psi, ?? = 80000 psi, ?? = 0.002 Estimated the steel area ?? Sketch the stress and strain distributions in the beam cross-section. The diagrams should show the location of the neutral axis and the compressive/tensile forces acting on the cross-section Calculate the nominal moment strength ?? and the design moment strength ??? [in kips-ft] Briefly explain how the formula of moment calculation can be derived Assume that the design moment strength is less than the factored moment. Hence, compression rebars will be added. The effective depth is ?′ = 1.5′′. Determine the steel area of compression rebars ??′ so that the compression bars yield at the flexural failure Based on ??′ determined in part d calculate the nominal…Calculate the required reinforcement bar and cutting length of stirrups for a simply supported beam as shown in Figure 1. The beam detailed and reinforcement specifications are given below. Use clear cover = 20 mm. Ø8 mm mild steel @ 150 mm Ø16 mm Clear cover 400 mm Ø20 mm 3.5 m 250 mm Figure 1Designers typically specify longitudinal reinforcement on all four sides of a square column cross section for which of the following reasons? Check all that apply. Bending moments can act about two section axes, not just one O There is less chance for steel placement mistakes during construction There is additional axial strength compared to a design with longitudinal steel on only two sides
- Explain briefly the concept behind limiting the amount of tension steel reinforcement in a reinforced concrete element.Although we design for flexure separately from shear, both flexure and axial force can have an impact on shear design. Is this statement correct? Explain ? Concrete reaching its maximum design strain rather than the steel reaching its yield strain is what always initiates flexural failure, regardless whether the section is under-reinforced, over- reinforced, or has a balanced reinforcement ratio. Is this a correct statement? justify your answer using a neat sketch. An under-reinforced beam section is safer than an over-reinforced one. Is this a correct statement? justify your answer using a neat sketch 6.A 200 mm × 220 mm timber post is subject to an unknown axial compressive load(F) that is eccentric to both principal axes as shown below. If the axial stress is2.4 MPa then:(a) What is the compressive load?(b) What are the applied moments in the x and y directions?(c) What are the moments of inertia in the x and y directions.(d) At what corner does the maximum stress occur? State whether it is tensile or compressive?` (e) Calculate the maximum stress at the corne
- What are the strengths and limitations of steel bars as a concrete reinforcement? (Please explain thoroughly)a. What are the factors responsible for the shear failure of a concrete beam without shear reinforcement? Explain briefly. b. Consider a concrete beam where there is no shear reinforcement provided in the concrete. Do you think, the shear force in the beam can still be resisted? Discuss briefly.Explain the how to calculate the pitch of the helical reinforcement.
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