Sunday, October 10, 2021

AISC Bolt Group Coefficient Calculator: Now An Android App

A special announcement.

The Eccentrically Loaded Bolt Group Coefficient Calculator that you used to see and read on this blog is now an Android App, available at Google Play Store.

The 'App' has become a Structural Connection Designer's handy tool when designing bolted steel connections using the Instantaneous Center of Rotation Method. It replaces the lookup tables provided by the American Institute of Steel Construction in its AISC Manual for calculating the bolt group coefficient.


Without any tool, designing eccentrically loaded bolted connections using the Instantaneous Center of Rotation Method is quite laborious and time-consuming. It involves determining the bolt group coefficient that requires an intensive iteration since its mathematical formulation is not a closed-form solution. In an attempt to simplify the process, the American Institute of Steel Construction (the AISC), in its AISC Manual, provided lookup tables to determine the bolt group coefficients through interpolation. The coefficients made the design much easier and faster. The tables, however, have inherent limitations as far as variations in Load Angle, Load Eccentricity, and Bolt Geometry are concerned. The tables, generally, do not address these variations.

I created this app with one purpose: to address and compensate for those limitations.

Below, I created a demo video to give you a glimpse of the app and how to use it, at least partially. But just a warning: the video is very raw. You may hear in the background some unnecessary sounds like clucking chickens and shouting of children playing. Please pardon me for this. As of this writing, I do not have video editing software.


You can download the AISC Bolt Group Coefficient Calculator for free from the apps store link below:

As a bonus, you can also download the AISC Structural Steel Shapes, another android app that I also wrote. It is a simple AISC Structural Shape Database viewer and an excellent tool for detailers and structural designers. Download it here for free:

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