February 4, 2021

WEBINAR: ACI 318-19 Code Updates in RISA & ADAPT

RISA-3D v19, ADAPT-Builder v20, RISAFloor v15 and RISAFoundation v13 have all been updated to ensure that users can take advantage of designs conforming to the latest standards according to code provisions found in ACI 318-19: Building Code Requirements for Structural Concrete. This webinar will focus on major updates to the code and how these changes impact concrete design in both RISA and ADAPT software products.

About the various important updates to the ACI 318-19 concrete code
How ACI 318-19 code updates are incorporated in RISA-3D for concrete columns and beams
How ACI 318-19 code updates are incorporated in ADAPT-Builder and RISAFloor ES for concrete slabs

The cost of the webinar is $30. To register, click the button below.

PDH Credits: 1.0 PDH credit will be sent to all attendees based on the email address used to register for the webinar. PDH credits cannot be sent to multiple people based on a single registration. If you wish to view the webinar as a group, please have each person in the group register individually and then after the webinar, email info@risa.com with a list of all group attendees. PDH credits will be sent out to these people as long as there is a corresponding registration.

Tags: Webinar, ADAPT, RISA, Concrete, New

June 20, 2019 | RISA-3D, Diaphragms, New, Shear Walls

Understanding Wall Panel Forces with Rigid Diaphragms

When modeling building structures using steel or composite steel floors, engineers typically utilize rigid diaphragms to distribute lateral loads (wind and seismic) to lateral load resisting elements such as shear walls, moment frames and braced frames. Rigid diaphragms represent a plane of very high rigidity and distribute load to elements which connect to them solely based on the stiffness of the elements. As a result, elements located within the extents of the diaphragm (such as wall panels) will have their forces “re-distributed” based on the relative stiffness of all the elements of that given level. Internally, this is accomplished by the fact that the rigid diaphragm is represented by rigid links that connect every node within the diaphragm (including those in a wall panel) at the level of the diaphragm. The best way to investigate how a rigid diaphragm is impacting the results on a given wall panel stack is to utilize both the Wall Panel Forces spreadsheet and the Internal Force Summation Tool for Walls. To easily review the results for a given wall stack, first select only the wall that you wish to evaluate the results for. Next, select the Filter Results button from the toolbar to the…

August 18, 2011 | RISA-3D, Loads, RISAFloor, RISA-2D, New

Using Projected Loads in RISA-3D

RISA-3D, RISA-2D and RISAFloor have the capability to project distributed and area loads onto members. Consider the case of snow load on two buildings: one with a flat roof and one with a sloped roof. Ignoring the concept of shedding, if both buildings have the same footprint then they should both have the same total weight of snow applied to them. This is because the snow doesn’t care what the shape of a building is as it falls. The same total amount of snow will fall on a given acre regardless of what’s on it. Below is an image illustrating roof rafters from both the sloped and flat roof beams. In both cases a vertical snow load of 100 lbs/ft has been applied in the global Y direction. Note that the total end reaction on the sloped rafter is 1.41k versus only 1.00k for the flat rafter. This is because the sloped rafter is actually 14.1 ft long, and we have applied the load as 100 lbs per linear foot of rafter. In order to get the correct behavior for snow we need to project the load onto the horizontal plane. The image below shows the same members, but with…

August 21, 2013 | RISA-3D, Plates, New

How can I transition a Plate Mesh from Round to Rectangular?

Transitioning plates from a circular (or elliptical) to a square (or rectangular) shape can be done easily using some of RISA-3D’s automated generation tools. Below is the procedure for transitioning a circle into a square, but it should be clear how this could be accomplished for other similar shapes. On the "Home" tab select "Templates" and then select "Circular Arc" Modify the properties of the circular arc to match the image below and then click "OK" The circle of nodes generated by the template should now look like this: Next generate nodes in a square arrangement at a distance away from the circle equal to the required offset between the two sections. Draw four members forming a square around the circle, as shown in the image below: With only the beams selected, click on the “Modify” tab and select “Global” from the "Move" section Specify an offset distance of 10ft in the Z increment Next, we can subdivide the members: With only the beams selected, click on the “Modify” tab and select “Add Nodes” from the "Members" section Select "Uniform" for the "Spacing Type" and choose "5" for the "Number of Segments" When the nodes have been added, delete the…