ENGINEERING – TRUCTURAL ENGINEERING — TEEL CALCULATOR
Connection Eccentricity
A precise tool.
What is the Connection Eccentricity & How does it work?
In an eccentric bolted connection the line of action of the applied load does not pass through the centre of the bolt group, creating a moment that must be resisted by the bolts. This moment is transferred to the bolts as an additional shear component, increasing the demand on each fastener.
The instantaneous centre of rotation for the connection is located at the geometric centre of the bolt pattern. The eccentricity (e) is measured as the perpendicular distance from the line of action of the resultant load to this centre. The eccentricity factor (phi) is used to combine the direct shear and the moment‑induced shear into a single demand per bolt.
The design check compares the combined demand with the shear capacity of a single bolt, which is based on the bolt’s net tensile area and the material yield stress. If the utilization is less than 100 % the connection is considered adequate.
\phi = \frac{e}{r}
\phi = eccentricity factor (ratio of eccentricity to bolt‑group radius)
Parameters
Result
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Frequently Asked Questions
What is eccentricity in a bolted connection?
Eccentricity is the perpendicular distance from the line of action of the applied load to the geometric center of the bolt pattern.
How does eccentricity affect the bolts in a connection?
Eccentricity creates an additional moment that is transferred to the bolts as shear, increasing the demand on each fastener.
Where is the instantaneous center of rotation located in a bolted connection?
The instantaneous center of rotation for the connection is at the geometric center of the bolt pattern.
How do you measure eccentricity in a bolted connection?
Eccentricity is measured as the perpendicular distance from the line of action of the applied load to the center of the bolt group.
What factors influence the calculation of eccentricity?
The calculation of eccentricity depends on the geometry of the bolt pattern and the position of the applied load relative to this pattern.
Why is it important to consider eccentricity in engineering calculations?
Considering eccentricity is crucial because it affects the distribution of loads among bolts, potentially leading to higher stresses and potential failure if not accounted for.
Results are for informational purposes only and do not constitute professional advice.