## Introduction

This calculator allows the user to analyse and check each bolt within a bolt group to ensure compliance with the Australian Standard AS 4100. The user defines the bolt group geometry by inputting the number of rows and columns of bolts. Using user input loads, the calculator then checks the shear force and tension (pull-out) force in each bolt.
A typical connection with a bolt group is a beam to column bolted connection.
❗This calculation has been written in accordance with AS 4100.

## Calculation

### Bolt Properties

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:8.8
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Bolt category / tightening method
:S
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:1
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Length of lap splice
:0mm
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Slip factor
:100
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### Bolt Group Geometry

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Number of rows in bolt group
:4
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Spacing between rows
:50mm
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Number of columns in bolt group
:2
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Spacing between columns
:50mm
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Width of baseplate
:100mm
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Depth of baseplate
:200mm
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F*x
:100kN
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F*y
:200kN
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ey, F*x eccentricity,
:0.1m
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ex, F*y eccentricity
:0.2m
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M*z (kNm)
:30
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Note, ex & ey are the force eccentricities from the weld group centroid. Refer to Output --> Weld Group Geometry for the coordinates of the weld group centroid in order to determine your ex and ey.
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V*o
:100kN
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e, V*o eccentricity
:0.3m
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### Bolt Properties

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Bolt type
:8.8/S
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Capacity reduction factor, ϕ
:0.8
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Reduction factor for lap connections, kr
:1.0
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Minimum tensile strength of a single bolt, fuf
:830MPa
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### Bolt Group Geometry

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Total number of bolts
:8
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Location of the Instantaneous Centre of Rotation (ICR):
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x coordinate of bolt group centroid (mm)
:25.0mm
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x coordinate of bolt group centroid (mm)
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y coordinate of bolt group centroid (mm)
:75mm
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y coordinate of bolt group centroid (mm)
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Second moment of areas:
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I_x (mm4)
:25000
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I_y (mm4)
:5000
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I_p (mm4)
:30000
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In-Plane Resultant Forces:
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Resultant applied in-plane moment, M*1 (kNm)
:60.0
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Out-of-Plane Resultant Forces:
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Resultant applied out-of-plane moment, M*o (kNm)
:30.0
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### ⬆️Design Checks

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Critical shear force applied on the bolt group, V*f
:180kN
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Critical tearout force applied on the bolt group, N*tf
:45kN
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Minimum required bolt
:M30
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Evaluation of each bolt in the bolt group:
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 ​ 139.75​ 45​ ​ ​ ​ ​ SAFE​ SAFE​ 2​ ​ 45.07​ 15​ ​ SAFE​ SAFE​ SAFE​ SAFE​ SAFE​ 3​ ​ 67.31​ -15​ ​ ​ SAFE​ SAFE​ SAFE​ SAFE​ 4​ ​ 164.41​ -45​ ​ ​ ​ ​ SAFE​ SAFE​ 5​ ​ 156.62​ 45​ ​ ​ ​ ​ SAFE​ SAFE​ 6​ ​ 83.85​ 15​ ​ ​ SAFE​ SAFE​ SAFE​ SAFE​ 7​ ​ 97.63​ -15​ ​ ​ ​ SAFE​ SAFE​ SAFE​ 8​ ​ 178.97​ -45​ ​ ​ ​ ​ SAFE​ SAFE​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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## Explanation

Connections in building structures use a minimum of two bolts and often more than eight bolts. The bolts used in a connection form a bolt group. A bolt group may be acted on by loads and bending moments in the plane of the bolt group (in-plane) or at right angles to it (out-of-plane loading).
See below for tabulated bolt data and information about the analysis of bolt groups.

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