Nearly 60 Years of Waiting! New Equations of ACI318-19 for Evaluating Shear Strength of Slender Reinforced Concrete Members
Keywords:
Shear, Reinforced Concrete, Transverse Reinforcements, EIT, ACIAbstract
The design of reinforced concrete members for shear resistance is an important task of a structural engineer, with the aim to prevent the so-called brittle failure. According to ACI318 design guidelines, shear resistance (nominal shear strength, Vn) can be calculated as the sum of the concrete (Vc) and transverse shear reinforcements (Vs), which could develop truss behavior associate with the concrete. ACI318 has clearly defined such design guidelines since 1963. However, the code-specified shear resistance, especially Vc , has continually been investigated and it has been noted that Vc is non-conservative in the following cases: (1) large members without transverse reinforcement and (2) members with low level of longitudinal reinforcement. Based on the aforementioned arguments, this paper summarizes the development of shear strength design in reinforced concrete members, particularly in those without shear reinforcement, which are commonly used in large beams, slabs, or footings. Furthermore, the limitations of the existing design standard and the changes in the current standard (ACI318-19), which would affect the traditional design in Thailand, are also presented.
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