October 29, 2020

Interaction of Shear Forces Acting Along Orthogonal Axes in Concrete

Recent tests and analytical results for concrete columns have indicated that considering shear along each centroidal axis independently can be unconservative. Therefore current versions of RISA-3D, RISAFloor and RISAFoundation have included the consideration for the interaction of shear forces acting along orthogonal axes per ACI 318-19 equation 22.5.1.11.

When Vu/ΦVn > 0.5 in both orthogonal directions, a new expandable section of the Detail Report will appear for the interaction equation.

RISA-3D

RISAFoundation

Tags: RISA-3D, RISAFloor, Concrete, RISAFoundation, New, v15, v19, v13

December 16, 2015 | RISA-3D, RISAFloor, Concrete, RISAFoundation, New

Concrete Design per ACI 318-14 Concrete Code now Available

The new ACI 318-14 code has been implemented into RISA-3D v14, RISAFloor v10, and RISAFoundation v8. To select this code for your design, simply choose them from the Codes tab of the Model Settings: One of the main changes for the 2014 ACI code is a change to the minimum flexural reinforcement for elevated slabs (RISAFloor ES) and mat slabs (RISAFoundation). Please see ACI 318-14 Sections 7.6.1 and 8.6.1 (and Chapter 13’s references to Chapter 7 and Chapter 8) for more information…

December 16, 2016 | RISA-3D, RISAFloor, RISAFoundation, New, Modeling

Viewing Coordinates in Cursor Display

In RISA-3D, RISAFloor, and RISAFoundation the cursor now provides additional information regarding the cursor coordinates. As you move your cursor around on your screen, a box adjacent to your cursor will appear and populate with the coordinates of the cursor. The mouse coordinates that are displayed are the coordinates of the grid point or joint that is nearest to the cursor. These are the same coordinates displayed in the Status Bar. If you would like to view the coordinates using your cursor then you can toggle this new feature by going to File-Application Settings and on the General tab check click the check box to Show current location coordinates next to cursor…

October 30, 2020 | RISA-3D, RISAFloor, RISA-2D, Concrete, RISAFoundation, New, Updated Shear Contribution for Concrete (Vc) per A, Interaction of Shear Forces Acting Along Orthogona, RISAFloorES

Concrete Design according to ACI 318-19 Now Available

The new ACI 318-19 concrete code has been implemented into RISA-3D v19, RISAFloor v15, RISAFoundation v13 and RISA-2D v19. To select this code for your design, simply choose them from the Codes tab of the Model Settings: A summary of the major changes that have been incorporated include: The expansion of permissible applications for high-strength reinforcement. As a result, many requirements for strength and ductility have been adjusted. Some of these requirements include but are not limited to the the strength reduction factor, the maximum/minimum flexural reinforcement limit, and the axial compressive strength of columns. The calculation for the shear contribution of concrete (Vc) in accordance with Table 22.5.5.1.The calculation of Vc must consider axial load (Nu) and/or the flexural reinforcement ratio (ρw) when Av > Av,min. A new size effect modification factor (λs) must be considered when Av < Av,min. The consideration for the interaction of biaxial shear forces in members when Vu/ΦVn > 0.5 in both orthogonal directions. New equations for the allowable compressive strength of concrete piles based on the type of pile. Additional slab reinforcement requirements at critical sections for punching shear. Refer to the articles linked below for more information on effects that ACI 318-19…