As per ACI 318-14, Clause 11.7.4.1, if longitudinal reinforcement is required for axial strength or if 'Ast' exceeds 0.01*Ag longitudinal reinforcement shall be laterally supported by transverse ties. When I go to Chapter 2, Notation and Terminology, this 'Ast' is referred to as total areas of non-prestressed longitudinal reinforcement. My question: Is this 'Ast' referring to the required area of steel (as per design calculations) or is this 'Ast' the actually provided steel by the EOR?
Context: We are designing a CIP concrete water tank with two layers of reinforcement. In order not to exceed the stress ratio, I just need to provide #5 @ 6" O.C. on each face. For this scenario, I do not need to provide transverse ties as per Cl. 11.7.4.1. However, what we want to do is significantly increase the rebar sizes to keep the stress ratio well below working stress. Also, we want to reduce the spacing of rebars as per ACI 350-20. Consequently, we want to specify #7 @ 4" O.C. on each face, which triggers Cl. 11.7.4.1.
Given this context, do we need to provide transverse ties?
Context: We are designing a CIP concrete water tank with two layers of reinforcement. In order not to exceed the stress ratio, I just need to provide #5 @ 6" O.C. on each face. For this scenario, I do not need to provide transverse ties as per Cl. 11.7.4.1. However, what we want to do is significantly increase the rebar sizes to keep the stress ratio well below working stress. Also, we want to reduce the spacing of rebars as per ACI 350-20. Consequently, we want to specify #7 @ 4" O.C. on each face, which triggers Cl. 11.7.4.1.
Given this context, do we need to provide transverse ties?
