Shear design in columns is based on the shear force envelope with the option to include or exclude axial force influence on concrete shear capacity.įor concrete design, compressive and tensile axial loads have positive and negative signs respectively. Slenderness effects are considered for both non-sway (braced) and sway (unbraced) frames.

The capacity ratio is computed for each column based on capacity interaction surfaces and axial force-biaxial bending in each load combination. The program generates EXACT (not approximate or empirical) P-Mx-My interaction surfaces for all sections according to user-specified design criteria. So Vu will not be greater than ϕλ sqrt(f'c)b w d in a design produced by ENERCALC, therefore Av,min is NOT required.The concrete column module designs concrete rectangular or circular columns against axial, uniaxial or biaxial bending as well as shear based on ACI 318-02/05/08/11/14 Code Provisions. The discussion points out that the shear strength of concrete depends on the relationship between Av,provided and Av,min.įortunately, section 9.6.3.1 (minimum shear reinforcement for nonprestressed beams) helps to clarify this issue by referring not to ϕVc, but explicitly to ϕλ sqrt(f'c)b w d.ĮNERCALC enforces expression (a) from Table 22.5.5.1. However in ACI 318-19, there is a lot of discussion about the shear strength of concrete as specified in 22.5.5.1. In ACI 318-14, the shear strength of concrete is specified in 22.5.5.1, and it has nothing to do with the relationship between Av,provided and Av,min. How is ENERCALC conforming to the new Av,min requirements for shear strength in ACI 318-19?ĪCI 318-14 says that a minimum area of shear reinforcing is required whenever Vu > phiVc/2.ĪCI 318-19 says essentially the same thing by saying Av,min, shall be provided in all regions where Vu > ϕλ sqrt(f'c)b w d.īoth of these imply that Av,min is NOT required when Vu is below the corresponding strength limit from each code. These requirements are presented in ACI 318-19 Table 9.7.6.2.2, and ENERCALC SEL reports the maximum permissible transverse spacing on Calculations > MVD Summary > Design Shear. One item is the concept of maximum permissible spacing of stirrup legs in the transverse direction (across the width of the beam). What's this maximum permissible spacing of stirrup legs in the transverse direction in ACI 318-19?ĪCI 318-19 introduced some new requirements for shear design.

Enercalc concrete beam cracked section