Timber Tension Joint


The HO3+ program can be used to calculate tensile splices in timber construction composed of up to three parts. For multi-part cross-sections, butt straps of solid wood, plywood, OSB or steel are available for selection.

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Discover now more programs from the section Timber & Roof!

  • Softwood of the strength classes C14 to C50
  • Hardwood of the strength classes D18 to D80
  • Glulam of the strength classes GL20c/h to GL32c/h
  • Plywood
  • Oriented strand board (OSB)
Structural system

Timber-to-timber connection:

  • Single-part tension members with exterior butt straps.
  • Two- and three-part tension members with interior and exterior butt straps.


Steel-to-timber connection:

  • Single-part tension members with up to four interior perforated plates or two exterior steel plates.
  • Two- and three-part tension members with interior and exterior butt straps of steel.



Through load case combinations:

  • Selection of the design situation
  • Ductility class
  • Duration of load
  • Design value of the axial force Nd at the cut face of the member, positive as the tensile force in the grain direction away from the node
  • Load case combinations can be disabled if required
  • Dowel pins
  • Fit bolts/bolts
  • Threaded rods
  • Nails
  • Brackets
  • Special dowels

The load-bearing capacity verifications of the fasteners are performed following Johansen’s theory. Suspension effects can be considered, if applicable. Based on the load-bearing capacity, the program determines the required number of fasteners, checks the minimum spacing to be complied with and performs the necessary verifications on the adjoining components in the area of the joint.

It is assumed that the butt straps are arranged symmetrically to the member axis. The loading is supposed to apply mainly in the central area of the member parts. A timber member can consist of three parts maximum.

The weakening of the cross section caused by the fasteners is considered in the verification of the connection area. The additional moment from distortion of the exterior butt straps is considered in a simplified manner in a stress verification with reduced tensile strength.

Document file formats
  • PDF
  • Word
  • Printer

User-defined scope.

Timber construction
  • DIN 1052
  • DIN EN 1995
  • ÖNORM EN 1995
  • NTC EN 1995
  • BS EN 1995
  • PN EN 1995

Support resources