What Is Structural Analysis of a Timber Building?

Structural analysis of a timber building is the calculation that shows its load-bearing members are adequate under vertical loads, earthquake, wind and snow. In light-frame buildings the walls are timber shear walls made of studs, chords, blocking and sheathing, and the floors are built from sheathing, joists and blocking. That is why the structural design of a timber house involves checking a large number of line members one by one.

In Türkiye, the basis of timber structure design is the Design, Calculation and Construction Principles for Timber Buildings (ABTHYE), published in Official Gazette No. 32499 of 24 March 2024 and in force since 1 January 2025. Seismic calculations are carried out to TBDY 2018.

StatiCAD brings this whole calculation into one model: timber shear wall and slab grids are generated with a command, the 87 load combinations required by the code for timber buildings are defined automatically, earthquake loads and internal forces are calculated, and every line member is checked to ABTHYE. The roof is built in the same model with wizards, and the results are passed on to reports and drawing sheets.

What StatiCAD Does for Timber Structures

The calculation chain of a timber building, from modelling to reports and drawing sheets.

Timber Shear Wall (Light-Frame Wall)

  • Timber shear wall sheathed on one or both faces: OSB grade, panel thickness and width, fastener spacing and connection stiffness
  • Edge studs, intermediate studs, top and bottom chords and blocking generated automatically with the grid command or entered by hand
  • Automatic calculation of wall shear capacity to TBDY 2018 and reporting of adequacy
  • Hold-down anchor and shear anchor data defined in the wall properties

Timber Slab, Beam and Column

  • Timber slab with slab sheathing, joists and horizontal blocking
  • Joists and blocking generated with the “Create Rib/Grid on Selected Slab” command
  • Stand-alone timber beams and timber columns; timber class selection from the material library (C24, etc.)
  • Analysis options with no diaphragm or with a semi-rigid diaphragm

ABTHYE Member Checks

  • Tension and compression stress checks parallel to the grain
  • Limit state check under bending and the lateral buckling limit state
  • Shear stress, rolling shear stress and the effect of torsional moment
  • Combined effects: bending moment and axial forces
  • Compression check perpendicular to the grain; moisture and size modification factors are taken into account
  • Weak-axis, buckling and torsion checks of every line member, including studs and intermediate beams inside the wall

Loads and Analysis

  • Snow load and wind suction pressure are entered to TS 498; the slabs and sheathing that receive the loads are selected
  • Wind load on exterior walls is calculated automatically from the edge where the wall lies and its angle in plan
  • 87 timber building load combinations, covering vertical, earthquake and snow loads, are defined automatically
  • Earthquake loads and member internal forces are calculated automatically

Timber Slab Vibration (ABTHYE 5.4.2)

  • Timber joist, composite (mechanically connected sheathing or cast concrete layer) and 3- or 5-layer CLT slabs
  • Joist and sheathing values detected from the members within the calculation axis
  • Results in the analysis warnings, the project checklist and a separate report page
  • This check is available in StatiCAD Ultimate

Roof Truss and Purlin Wizards

  • 13 templates including Fink, Howe, Pratt, Warren, king post, trapezoidal, lean-to and arch; dimensioned preview
  • Place trusses in an array in plan with two points; edit a truss you have created in the same window
  • Axes meeting at the joint, automatic hinges and a pinned + roller bearing post support model
  • Automatic purlins between trusses: layout by spacing, count or truss joints, and eave extension at the edges

Roof Wizard and Roof Cladding

  • Hip, gable and gable-end roofs from a roof polygon: rafters, purlins, ridge, hip and valley rafters, posts, struts and fascia in one go
  • Update a saved roof by opening it and changing its settings
  • Automatic meshing of the roof cladding according to the rafter, purlin, ridge and valley elevations
  • Matching the top elevations of posts, walls and shear walls to the beam elevations
  • Checking of roof members with the timber beam and column design

Mixed Structures and Resolving Inadequacies

  • Timber, masonry and reinforced concrete elements in the same project; timber elements can also be defined in masonry and reinforced concrete structural systems
  • Inadequate elements shown in the 3D view, with quick selection and editing
  • Bearing length, lateral buckling length and moisture condition set in the element settings
  • Optional TS 647 beam check (section and deflection); the main design follows ABTHYE

Screenshots from the Program

Ground floor plan of a timber building: timber shear walls and slab joists

Timber shear walls and slab joists in the floor plan.

Wall Properties window, Timber Shear Wall tab: panel sheathing and connections

Panel sheathing, fastener spacing and in-wall members of a timber shear wall.

3D finite element model of a two-storey timber building

3D finite element model with timber shear walls and slab grids.

Roof truss wizard: Howe template and dimensioned preview

Roof truss wizard: 13 templates and a dimensioned preview.

3D preview of a hip roof in the roof wizard window

Roof wizard: hip roof from a roof polygon and 3D preview.

Ground floor formwork plan: timber beams and CLT slab

Timber beams and CLT slab in the ground floor formwork plan.

Go step by step through the two-storey timber building example

How Does It Work?

  1. In Project General Settings, select the timber structure load combinations and enter the snow load and wind suction pressure.
  2. Draw the walls and set the element type to Timber Shear Wall; enter the panel sheathing and the in-wall member sections, then create the grid.
  3. Draw the slabs; create a rib/grid on the selected slab to generate the joists and blocking.
  4. Build the roof with the roof wizard or with the truss and purlin wizards; use the macro to set the roof cladding to the beam elevations.
  5. Run the analysis; find the inadequate elements in the 3D view and edit them.
  6. Produce the reports; save the foundation layout plan, floor and formwork plans and the axis-by-axis side elevations as DXF.

Reports and Drawing Sheets

In the Timber Element Reports group and the drawing section:

  • Timber shear wall design (TBDY 2018 and ABTHYE 2025)
  • Timber element design (ABTHYE 2024)
  • Timber beam design (TS 647, optional)
  • Timber slab vibration (ABTHYE 5.4.2 / 4.8.4.7.1; Ultimate)
  • Foundation layout plan, floor plan and formwork plan
  • Axis-by-axis side elevations of the building; DXF output

Help Documents

Step-by-step usage, worked examples, theoretical basis and verification studies in the Knowledge Base.

Verification and Scope

The timber slab vibration check has been compared with the worked example in the timber structures guide: stiffness, first natural frequency (14.27 Hz), deflection and velocity criterion values match the guide. For composite slabs, connection stiffness, the γ factor and effective bending stiffness have been verified by hand against the guide values and hand calculations, and the slabs in the example project have been verified by hand.

CLT slabs with 7 or more layers and CLT slabs with a concrete layer are outside the scope of the vibration check.

See the comparison tables

Codes and Standards

ABTHYE 2025 TBDY 2018 TS 498 TS 647 (optional)
Which edition? Timber building design is available in the StatiCAD Hybrid, Ultimate, Profesyonel and Standart editions. The slab vibration check is available only in Ultimate. The roof truss, purlin and roof wizards can be used in all editions.

Frequently Asked Questions

Which code is used for structural analysis of a timber building?

Timber members are checked with the strength design principles of ABTHYE, in force since 1 January 2025. The earthquake calculation and the shear capacity of timber shear walls follow TBDY 2018; snow load and wind suction pressure are entered to TS 498. TS 647 is available in the program only as an optional legacy beam check.

Can a timber house structural design be done with StatiCAD?

Yes. The shear walls, slabs, roof and stand-alone beams and columns of a light-frame timber house are built in a single model. After the analysis you get the calculation reports, the foundation layout plan, floor plan, formwork plan and axis-by-axis side elevations.

Can a timber roof be analysed?

Yes. The roof truss wizard builds trusses from 13 templates, the purlin wizard adds purlins between trusses, and the roof wizard generates hip, gable and gable-end roofs from a roof polygon in one go. The members enter the analysis model and are checked with the timber beam and column design.

Is timber slab vibration checked?

Yes, in StatiCAD Ultimate. Timber joist, composite and CLT slabs are checked along the calculation axis to ABTHYE 5.4.2 and 4.8.4.7.1. The check does not change the analysis results; the results are written to the analysis warnings, the project checklist and a separate report page.

Can timber elements be used in reinforced concrete or masonry buildings?

Yes. Timber elements can also be defined within masonry and reinforced concrete structural systems; timber, masonry and reinforced concrete elements are solved together in the same project, and the calculation reports are produced in a single file.

Which StatiCAD editions include the timber structure software?

Timber building design is included in the StatiCAD Hybrid, Ultimate, Profesyonel and Standart editions; it is not in Betonarme, Yığma Pro or Yığma Standart. The slab vibration check is available only in Ultimate. The roof truss, purlin and roof wizards can be used in all editions.

Related Pages

Analyse your timber building with StatiCAD

Download the demo version to try timber shear wall, slab and roof modelling for free, or let us work out the right edition for you together.