SIA 265:2021 — Timber structures

SIA 265 is the Swiss standard for the design of load-bearing timber structures, published by the Swiss Society of Engineers and Architects (SIA). It covers the design values of timber and wood-based materials, the verification of members and connections, the fire situation and serviceability. It is used together with SIA 260 (basis of structural design) and SIA 261 (actions on structures). The current edition is SIA 265:2021.

Edition: SIA 265:2021
Title in other languages: Constructions en bois · Holzbau

Modules that apply SIA 265

Bearing at a support
Compression perpendicular to the grain at a support, at the ultimate limit state.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.3.2.1, § 4.2.2.2, § 4.2.2.3

Plan: Free
Bearing at a support — fire situation
Compression perpendicular to the grain at a support in the fire situation, with the charred contact surface.
Clauses checked: § 3.2.1.3, § 3.3.2.1, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5

Plan: Basic
Beam in biaxial bending
Bending about both axes of a rectangular timber or glulam beam, with lateral torsional buckling, at the ultimate limit state.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.4.2.2, § 3.4.2.3, § 4.2.3.1, § 4.2.9.1, § 4.2.9.2, § 4.2.9.3, § 5.7.2.2, Annex B

Plan: Free
Beam in biaxial bending — fire situation
Bending about both axes on the charred residual section, with lateral torsional buckling, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.4.2.2, § 4.2.3.1, § 4.2.9.2, § 4.2.9.3, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5, Annex B

Plan: Basic
Bar in compression
Axial compression with buckling about both axes, at the ultimate limit state.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.4.2.2, § 4.2.2.1, § 4.2.8.1, § 4.2.8.2, § 4.2.8.3, § 4.2.8.4, Annex B

Plan: Free
Column in compression — fire situation
Axial compression with buckling on the charred residual section, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.4.2.2, § 4.2.8.2, § 4.2.8.4, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5, Annex B

Plan: Basic
Bar in compression and biaxial bending
Axial compression with bending about both axes: cross-section in the stabilised zone, buckling in the unstabilised zone.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.4.2.2, § 3.4.2.3, § 4.2.2.1, § 4.2.4.2, § 4.2.8.2, § 4.2.8.3, § 4.2.8.4, § 4.2.8.5, § 4.2.9.1, § 4.2.9.2, § 4.2.9.3, § 5.7.2.2, Annex B

Plan: Free
Compression and biaxial bending — fire situation
Axial compression with bending about both axes on the charred residual section, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.4.2.2, § 4.2.4.2, § 4.2.8.2, § 4.2.8.4, § 4.2.8.5, § 4.2.9.3, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5, Annex B

Plan: Basic
Bar in tension
Axial tension parallel to the grain on the net section, at the ultimate limit state.
Clauses checked: § 2.2.2, § 2.2.6, § 3.2.1.3, § 3.4.2.2, § 4.2.1.1, § 6.1.1.8

Plan: Free
Bar in tension — fire situation
Axial tension on the charred residual section, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.4.2.2, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5

Plan: Basic
Beam in simple bending
Bending about y-y of a rectangular timber or glulam beam, with lateral torsional buckling, at the ultimate limit state.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.3.2.1, § 3.4.2.3, § 4.2.9, § 4.2.9.1, § 4.2.9.2, § 4.2.9.3, § 5.7.2.2, Annex B

Plan: Free
Beam in simple bending — fire situation
Bending about y-y on the charred residual section, with lateral torsional buckling, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.3.2.1, § 4.2.9, § 4.2.9.2, § 4.2.9.3, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5, Annex B

Plan: Basic
Beam in shear
Shear stress, interaction with stress across the grain and notched supports, at the ultimate limit state.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.3.2.1, § 3.4.2.2, § 4.2.3, § 4.2.5.1, § 4.2.7.1, § 4.2.7.2, § 5.2.2, § 5.2.2.1, § 5.2.2.2, § 5.7.2.2

Plan: Free
Beam in shear — fire situation
Shear on the charred residual section and its interaction with stress across the grain, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.3.2.1, § 3.4.2.2, § 4.2.7.1, § 4.2.7.2, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5, § 5.2.2, § 5.2.2.1, § 5.2.2.2

Plan: Basic
Beam in torsion
Torsion alone and combined with shear, at the ultimate limit state.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.3.2.1, § 3.4.2.2, § 4.2.3, § 4.2.5.2, § 4.2.5.3, § 5.7.2.2

Plan: Free
Beam in torsion — fire situation
Torsion, alone or with shear, on the charred residual section, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.3.2.1, § 3.4.2.2, § 4.2.5.3, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5

Plan: Basic
Bar in tension and biaxial bending
Axial tension with bending about both axes, with lateral torsional buckling, at the ultimate limit state.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.4.2.2, § 3.4.2.3, § 4.2.1.1, § 4.2.4.1, § 4.2.9.1, § 4.2.9.2, § 4.2.9.3, § 5.7.2.2, § 6.1.1.8, Annex B

Plan: Free
Bar in tension and biaxial bending — fire situation
Axial tension with bending about both axes on the charred residual section, in the fire situation.
Clauses checked: § 3.2.1.3, § 3.4.2.2, § 4.2.4.1, § 4.2.9.2, § 4.2.9.3, § 4.5.2.2, § 4.5.2.3, § 4.5.2.5, Annex B

Plan: Basic
Beam deflection — serviceability
Instantaneous and long-term deflection of a beam with creep, against the limits of SIA 260 annex A.
Clauses checked: § 3.2.1.3, § 3.2.2.2

Plan: Free
Column displacement — serviceability
Horizontal displacement of walls, frames and columns with creep, against SIA 260 annex A table 4.
Clauses checked: § 3.2.1.3, § 3.2.2.2

Plan: Free
Compression reinforcement of a bearing
A bearing reinforced with fully threaded screws or rods: timber and screws together, then the timber at the screw tips.
Clauses checked: § 2.2.6, § 3.2.1.3, § 3.3.2.1

Plan: Pro
Reinforcement of a curved or tapered beam
Glued-in rods, screws or bonded plates taking tension across the grain in curved, pitched-cambered and arched beams.
Clauses checked: § 2.2.6, § 3.2.1.3, § 5.1.3, § 6.4

Plan: Pro

The norm itself is published by SIA and is not reproduced here. Each module cites the clauses it applies, so every step can be checked against your own copy of SIA 265.