Why do stirrups have thread stirrups and round bars? When are they used?
Your question is actually related to steel and concrete work of a force of synergy in the reinforced concrete structure, steel usually is in tension, in order to ensure the reinforcement force can be well transferred to concrete, so as not to slip, we put the steel processing into whorl ribbed or other rib the shape, its purpose is to increase the adhesion between steel and concrete. Round steel is usually used in lower grade, smaller diameter reinforced steel, mainly because of its low strength, without adding ribs, round bar and concrete bonding between the relay can ensure that its strength is very good play. Therefore, steel bars are mainly used in places where the force is not large and the calculation of the reinforcement is very small.
Oh, the main reason is the force, not only for steel rebar, general structure of round diameter is less than or equal to 10, 12 and above with rebar (hot-rolled ribbed bar)
Hello, you say the problem is not what time, but the design requirements in that place, accept the stirrup size number with different encryption and so on, have a certain standard, the general drawings above have detailed instructions
