EXPLAIN (flexural strength requirement for beams) a. Sectional Strength b. Equilibrium and Strain Compatibility c. Design Assumptions for Concrete
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- What is the magnitude of the compressive force on the left plumb in kN? F1 the steel and the left column concrete are bonded, what is the deformation due to applied load? part 3 is picturedGive the relationship between the compressive, tensile and flexural stress of concrete in terms of percentage of strength.Which of the following statements is true for design properties of non pre-stressed steel reinforcement as per NSCP 2015? *Can choose more than one. A. For non-prestressed bars and wires, fy shall be Es times steel strain for any value of strain. B. For tensile steel strains greater than that corresponding to fy, stress shall be Es times steel strain. C. For non-prestressed bars and wires, the stress beyond fy shall be Es times steel strain. D. For tensile steel strains greater than that corresponding to fy, stress shall be considered independent of strain and equal to fy.
- o Why the, tensile strengths of concrete are of the order of 10 and 15%of the compressive' strength..draw the stress-strain curve of concrete in compressionQ4: For the RC beam section shown in figure below, find the location of neutral axis (N.A) and the stresses in concrete & steel reinforcement at tension and compression side. If concrete modulus of rupture (tensile strength) equals 10% of f'c, is it expected to crack at tension side? As (30 25 mm) = 1500 mm² f'c = 30 N/mm² fy = 420 N/mm² Es = 200000 N/mm² Ec= 20000 N/mm² 500 450 250
- The structural efficiency in managing bending, shear and for steel vs concreteThe preliminary design is important because: O A. The designer calculates the required reinforcement amounts in this stage. O B. This stage provides the final dimensions of elements regardless of the design forces. O C. All of the reasons mentioned. D. The size of structural elements determines the stiffness needed for the structural analysis.| Choose the most appropriate answer for the following: 3. Which one of the following is not categorized as a long-term loss of pre-stress in a pre-stressed concrete member? Loss due to elastic shortening b. Loss due to creep c. Loss due to shrinkage а. d. Loss due to relaxation of steel 4. One of the following is not correct for pre-stressed concrete: a. Reducing cracks in the concrete b. High strength of concrete and steel c. Costy d. Suitable for long span and those carrying heavy loads. 5. Cross ties are used if the distance between a bar and the corner bar is greater than... 100 inches b. 100 cm c. 150 inches d. 150 mm а.
- CASE:A rectangular beam has the dimensions (see Fig.1) b = 15 in.,h = 30 in., and d = 27.37 in. and is reinforced with three No.9 bars. The concrete compressive strength fc' is 4000 psi, and the tensile strength in bending (modulus of rupture) is 475 psi. The yield point of the steel fy is 60,000 psi, the stress-strain curves of the materials being those of Fig.2. Determine the stresses caused by a bending moment M = 45 ft-kips.Question1:Check this case, would the concrete of the beam crack? Please calculate the strengths of those two materials in this beam.Question2:Suppose the beam under this case is subject to a bending moment M = 110 ft-kips (rather than45ft-kips as previously). Calculate the relevant properties and stresses.Question3:Determine the nominal moment Mn at which the beam of this case will fail. Question4:Have a comparison of the calculation results with those of three questions.Concrete has no tensile strength. True FalseGenerally, compressive strength normally considers in all stages in our designs. Explain and state other engineering strength that needed to be taken care of in the process of design. Comment on how it affects reinforce concrete structure.