Structural Central

Tools for Structural Engineers

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Bolt Group Tool
Analyze and Design Eccentrically Loaded Bolt Groups

What is the Bolt Group Tool?

Structural Central's Bolt Group Tool is structural engineering software that allows you to quickly generate the calculations required to analyze an eccentrically loaded bolt group used in a structural connection and design the bolts for the required strength.

The calculations consider a load that is oriented in any direction, and use it to determine the shear force in each bolt. This gives you the ratio of the applied load to the maximum bolt reaction (bolt group coefficient), which can then be used to determine the total load-carrying capacity of the bolt group.

▸ Inputs
▸ Drawing
▸ Results Summary
▸ Calculations
Interface Preview
Interface Preview

How does the software work?

INPUT OUTPUT

Bolt Coordinates

Bolt Reactions

Applied Load Location & Direction

Bolt Diameter & Material

Bolt Group Capacity

What can the Bolt Group Tool do?

Bolt Group Tool Features

Elastic and Inelastic Methods

The two most common analysis methods for bolted connections are included, so you can select whichever method applies to your design. The procedures for both of these methods are as described in Part 7 of the Steel Construction Manual produced by the American Institute of Steel Construction (AISC).

Analyze or Design

The calculations automatically adjust, based on your input, to be just for analysis or also design. The ratio of the applied load to the maximum bolt reaction is always determined, but if you also provide the design load, the minimum bolt diameter will be found. Alternatively, you can provide the bolt diameter, and then the stresses in the bolts will be calculated instead.

Design Code

Calculate bolt capacities per the Specification for Structural Steel Buildings (ANSI/AISC 360) which is the Referenced Standard for steel design of the International Building Code (IBC).

Design Criteria

Determine the strength of the bolts using Load and Resistance Factor Design (LRFD) or Allowable Strength Design (ASD), loaded in single or double shear.

The shear strength of the bolts will use the preferred material specification (ASTM F3125 Grade A325) by default, or you can select another common specification, or just set the nominal shear stress, Fnv, directly.

Factored or Unfactored Loads

The applied load can be entered as either a single load or as multiple loads with different load types (Dead, Live, Wind, etc). Multiple loads will be combined automatically using the LRFD or ASD load combinations provided by Chapter 16 of the International Building Code.

Instant Results

The inelastic method, or instantaneous center of rotation method, is normally an iterative procedure that requires guessing many points of rotation until equilibrium is met. The Bolt Group Tool includes an algorithm for identifying this location automatically, so you don't have to.

What do the calculations look like?

Bolt Group Calculation

How much does it cost?

It is free to sign up for Structural Central, which will allow you to access all of the tools. In the future, some features will be limited to users with paid licenses such as saving and printing.

How do I get started?

Click the sign up button below, confirm your email address, and then start generating structural engineering calculations!

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