Acta Univ. Agric. Silvic. Mendelianae Brun. 2008, 56, 143-150
Published online 2014-11-08

Finite-element model of tread of stair with loadbearing bolts

Radek Pospíšil, Zdeňka Havířová

Ústav základního zpracování dřeva, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 3, 613 00 Brno, Česká republika

Stair with load bearing bolts is the special modern type of wooden staircase. This new type of staircase needs a basic verification by valuable standards for using in a different indoor using. Stair with load bearing bolts is combined wooden and metal materials and their mechanical properties in construction.
The goal of this paper is to review wooden tread behaviour as consequence of static load defining by Eurocode 5, implemented in Czech standards. Static load is exactly defined in different load values and the loading places. The three different loading place dimensions are defined by Eurocode 5 too.
The wooden tread mechanical behaviour is modelled by FEM software ANSYS 11.0. The numerical simulation offers the distribution of specific magnitudes in the numerical model. The analysis is broken into three parts: geometric model, material model and finite element model. The geometric mo­del is created via script by Ansys Parametric Design Language. This method allows using parametric creation. Material model is defined like linear elastic material model for nine independent values.
The defined evaluative criteria begin to ultimative limit state and serviability limit state. The Euro­code 5 for this case defined the minimum load value and the maximum deflection value in vertical direction. The last selected is Hoffman’s failure criterion used to identify the possible crash places. Hoffman’s failure criterion is appropriate for orthotropic material like wood. The loading places must simulate the real constructional tread using.


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