July 30, 2020

Introducing Integrated Design: Seamlessly Linking Architecture and…

Learn how Graphisoft and RISA are working together to leverage model information created by the architect to create a more seamless workflow, while minimizing the duplication that is typical of today's design process:

Feature	ADAPT-PT/RC	ADAPT-Builder
Preliminary Sizing	X	X

Tags: RISA, New, BIM, Archicad

May 15, 2013 | RISA-3D, Plates, New, Deflection

How can I find the deflection of plates?

Below is a model of a flat concrete slab made of plates. In order to ensure adequate serviceability of the slab, you may need to check the deflection of the slab between columns. However, RISA-3D only reports Member and Joint Deflections. There is no such thing as a “Plate Deflection”. If you would like to plot the deflection between columns you can use a dummy member. Open the Section Sets spreadsheet and go to the General tab. There you can create a dummy member defined as a rectangular 1” x 1” beam. Next, draw the dummy member in your model along the line which you would like the deflection plotted. Because this member has such a small area and moment of inertia its stiffness will have a negligible impact on the model’s results. Because it is a Physical Member it will automatically connect to all of the plate corners which it passes (see Plate-Member Interaction) Link: Plate-Member Interaction After solving you can look at a detail report for the member to see a detailed deflection diagram…

November 13, 2019 | RISA-3D, v18, New, Printing, Graphics, Snapshot

Improved Graphics and Report Printing

RISA-3D's new report printing interface helps you quickly organize and print reports. Easily include spreadsheet output, detailed reports and graphics in…

April 7, 2020 | RISA-3D, Concrete, New, Shear Walls

Understanding Out-of-Plane Shear Capacity of Concrete Wall Panels

When designing concrete shear walls for lateral loading, RISA-3D includes design checks for both in-plane and out-of-plane shear. In the condition where a concrete wall is under both axial tension and out-of-plane shear, the out-of-plane shear limit state for a specific region within the concrete wall detailed report includes the details shown below: This limit state may cause users to ask the question: “why is the a phi*Vns term listed when no out-of-plane shear reinforcement is present?” The answer is that when calculating the out-of-plane shear capacity of the concrete wall, RISA-3D considers Shear Friction developed at the crack interface. ACI 318 code defines shear friction as the shear transfer across any given plane, such as an existing or potential crack, an interface between dissimilar materials, or an interface between two concretes cast at different times. In this case, the existing/potential cracks condition applies. When axial tension and out-of-plane shear are applied to the concrete wall, cracks will form across the wall thickness as explained by the simplified force diagram shown below: The shear sliding at the crack generates tensile forces Fs in rebar. In return, these tensile forces, Fs cause compression forces, Fc at the concrete crack interface. The…