(5) The frequently used repair technique of drilling a hole in front of a pre-ex

Question

(5) The frequently used repair technique of drilling a hole in front of a pre-existing crack in a structural beam stops the crack from advancing because (a) it increases the material's fracture toughness (b) it reduces the applied load on the beam (c) it reduces the stress intensity factor (d) it increases the stress intensity factor (e) None of the above (6) Reinforced concrete (a) is a compound (b) is an alloy (c) is a composite (d) is an element (e) is none of the above purpose of steel in a reinforced concrete member can be (a) to provide tensile strength (b) to provide ductility under both tension and compression (c) to provide additional compressive strength (in addition to concrete's capacity) (d) to control cracking of concrete (e) all of the above (7) The (8) The sum of tension (positive) and compression (negative) forces along the axis of a beam (which does not have any prestressing) (a) is greater than zero if the beam is made of reinforced-concrete (b) is zero only if the beam is made of only one material (either concrete or steel) (c) is zero regardless of the material/material combination (d) is less than zero if the beam is made only of steel (e) None of the above (9)Real reinforced concrete beams are always designed to ensure (a) concrete crushes before steel yields (b) steel yields before concrete crushes (c) steel yielding and concrete crushing happens simultaneously (d) steel and concrete do not fail even under infinitely large load (e) none of the above

Explanation / Answer

6) option c is correct that is (RC) is a composite material in which concrete's relatively low tensile strength and ductility are counteracted by the inclusion of reinforcement having higher tensile strength or ductility. 7) option d is correct If a material with high strength in tension, such as steel , is placed in concrete, then the composite material,reinforced concrete resists not only compression but also bending and other direct tensile actions and cracks also. According to chegg rules only 1 question is to be answered

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