EN 1380:2009 – Timber structures – Test methods – Load bearing nails, screws, dowels and bolts

1 Scope
This European Standard specifies test methods for determining the strength and deformation characteristics of laterally loaded connections with nail, screws, dowels and bolts in load-bearing timber structures.
The methods assess connections with members of timber (solid timber or glued laminated timber) or wood-based products or metal plates (but not punched metal plate fasteners) in the combination proposed for use in service.
The methods are used to determine load-slip characteristics and maximum load of connections where various angles between the applied force and the timber grain direction, or the main direction of the wood-based products,respectively, are possible.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 322, Wood-based panels — Determination of moisture content
EN 323, Wood-based panels — Determination of density
EN 13183-2, Moisture content of a piece of sawn timber — Part 2: Estimation by electrical resistance method
EN 14080, Timber structures — Glued laminated timber — Requirements
EN 14081-1, Timber structures — Strength graded structural timber with rectangular cross section — Part 1:General requirements
EN 14358, Timber structures — Calculation of characteristic 5-percentile values and acceptance criteria for a sample
EN 14592, Timber structures — Dowel-type fasteners — Requirements
EN 26891:1991, Timber structures — Joints made with mechanical fasteners — General principles for the determination of strength and deformation characteristics (ISO 6891:1983)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
deformation of the connection
mean value of the measurements of the relative displacements of the members
3.2
dowel type fasteners
elements such as nails, screws, dowels and bolts as defined by EN 14592
4 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
b width of member cross-section, in millimetres
F load, in newtons
t member thickness, in millimetres
5 Requirements
5.1 Timber
The timber (solid timber or glued laminated timber) shall satisfy the requirements of EN 14080, EN 14081-1 and shall be selected in accordance with either of the methods given in EN 28970.
For each test piece, the individual members to be joined shall be selected to ensure a test piece of balanced density.
For a group of similar test pieces, separate planks shall be used for each test piece.
NOTE The members should be free from major defects, which could lead to premature failure in the area away from the fasteners.
5.2 Wood-based products
The specification of the wood based products shall be established. The products used for the individual members of the test pieces shall be representative of the class or range of product to which they belong and the relevant properties shall be declared.
One unique grade shall be used to make the test pieces. For each test piece, the individual members in the connection shall be selected from separate pieces of material.
EN 1380:2009 – Timber structures – Test methods – Load bearing nails, screws, dowels and bolts