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Timber Bolt Joint Designer to AS 1720.1's banner

Timber Bolt Joint Designer to AS 1720.1

Verified by the CalcTree engineering team on August 21, 2024

This calculator designs timber bolt joint connections. It checks the capacity of bolt joints connecting two timber members, subject to applied shear or tension forces in the bolts.
All calculations are performed in accordance with AS 1720.1-2010.


Calculation

Assumptions

Timber Member Properties

Joint Configuration

Define joint properties

Joint Type and Load Direction



Joint type
:Type 1 - Shear​



Load direction
:Perpendicular to the grain​



Bolt size
:M12​



Washer shape
:Round​



Nd,tb
:27000N​



Minimum washer thickness
:3mm​



Minimum washer length
:55mm​



Bearing area Aw
:750mm2​

Set joint layout


Rows
:3​



Sx
:60 mm​



Min Sx (horiz spacing)
:48mm​



Sx check for spacing
:✅ ​



Columns
:2​



Sy
:60 mm​



Min Sy (vert spacing)
:60mm​



Sy check for spacing
:✅ ​



Total bolts resisting, n
:6​



Min edge distance
:48mm​



Min end distance
:60mm​




Can’t display the image because of an internal error. Our team is looking at the issue.


The plot assumes the x-axis is the axis parallel to the grain.


Modification factors

Design Capacity



Phi
:0.80​


Capacity reduction factor



Q_sk
:9180N​


Characteristic strength per joint



N*
:20 kN​



N_d,j
:33.93kN​



Utilisation
:59%​



Check
:✅ ​


Bolt joint capacity



Explanation

The strength of bolted timber joint connections is largely dependent on the effective timber thickness,

.

Code Parameters and Equations

AS 1720.1 categorises a connection type into either "type 1" or "type 2" for the purpose of design. The code also prescribes minimum dimensions for the bolt set-out.
👉Unlike nails and screws, bolts are fastened on both sides and therefore bolts are only used in "side grain" (not "end grain") applications.

Type 1 Joint

Type 2 Joint

Minimum Spacing, Edge and End Distance



Related Resources

  1. Timber Nailed Joint Designer to AS 1720.1
  2. Timber Screwed Joint Designer to AS 1720.1
  3. Timber Beam Calculator to AS1720.1
  4. Timber Column Calculator to AS1720.1
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