Tips & Tricks

November 19, 2024

How to Run a Basic Dynamic Eigensolution in RISA-3D?

Welcome to a high-level walkthrough of dynamic analysis in RISA-3D! This guide introduces essential aspects of modeling dynamics, focusing on natural frequencies, mode shapes, and the impact of dynamic behavior on structural integrity. The Dynamics Scenario Imagine we’re tasked with evaluating the stability of a cantilevered pedestrian bridge that spans over a city street. The bridge is connected to a building on one side and features decorative panels and a lightweight canopy. The concern? Wind gusts and foot traffic could cause the bridge to vibrate. Our goal is to understand its dynamic properties—natural frequencies and mode shapes—and assess whether it can handle these dynamic forces without compromising structural stability. We start by setting up dynamic mass for each load case: Canopy Load: Applied uniformly along the length of the bridge to account for wind effects. Pedestrian Load: Simulated at intervals along the span to reflect walking traffic. Decorative Panels: Modeled with specific weights on each side. Once mass and stiffness are set, RISA-3D enables us to simulate how the structure behaves dynamically, revealing which parts might be sensitive to specific frequencies or forces. Running the Eigensolution Analysis In RISA-3D, we use an eigensolution to identify: Natural Frequencies (intrinsic vibration rates…

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User Defined Reinforcement
October 7, 2017

User Defined Reinforcement

RISAFloor ES v12 now includes the ability to manually define user reinforcement in concrete slabs.

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Eurocode Steel Design According to EN1993-1-1:2014 now Available
October 4, 2017

Eurocode Steel Design According to EN1993-1-1:2014 now Available

You can now set the L-Torque length for the EN1993-1-1:2014 code in RISA-3D and RISAFloor. In previous versions of the Eurocode, RISAFloor and RISA-3D used the full member length as the torque length when calculating torsional buckling. Now, per EN1993-1-1:2014 Section 13.3.2, we’ve added the...

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Detach an Integrated RISAConnection Model
October 3, 2017

Detach an Integrated RISAConnection Model

RISAFloor, RISA-3D, and Revit can export connection rule and loading information to streamline the design process for a project with numerous connections. This process helps to quickly create connections with the member shape, geometry, and loading information from the original program.

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Custom Loading in Integrated RISAConnection Model
September 15, 2017

Custom Loading in Integrated RISAConnection Model

RISAConnection v7.0.1 includes the option for customized loading in an integrated RISAConnection model. If you have used RISA-3D or RISAFloor to export connection rules for design in RISAConnection, they also exported over the forces per the solved load combinations.

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Enhanced Live Load Reduction
September 14, 2017

Enhanced Live Load Reduction

The consideration of Live Load reduction is a feature that has been in RISAFloor from the very beginning. However, recent changes to the interface make it significantly easier for you to understand how live load reduction is affecting the design forces in your structure.

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Vertical Slab and Beam Offsets
September 13, 2017

Vertical Slab and Beam Offsets

In RISAFoundation, you can add a vertical offset for slabs or beams. Traditionally, RISA uses centerline analysis which aligns all elements at their centerline. This is a common structural analysis assumption as the loads will get transferred to the centerline even if there is difference in the...

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