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Realization of the wood-framed buildings in Europe and in the Nord America are discussed in the introduction to presented paper. Current directions in realizations of single family, multifamily and the other purpose the wood-framed buildings are outlined in paper. Paper describes formation of structural building elements industrially constructed and then dispatched to site. Next part of the paper presents analytical models applied in analysis of internal forces in structure. Numerical model is based on the assumptions of the finite element method. Paper contains exampled application of numerical model in 3D analysis of modular element built-in as the lower segment of multistorey and multifamily building. Summary and conclusions are ending the paper. [ABSTRACT FROM AUTHOR]

Lightweight roof and wall structural systems are widely used for cladding of steel portal frames. It is a well-known fact, that assembled systems of profiled sheeting and purlins show significant stiffness to in-plane loads, which action is referred to as stressed skin effect. This research aimed to investigate the influencing parameters of stressed skin effect in those nonstandard diaphragm constructions, in which seam fasteners are omitted. The focus of this paper is on the results of an experimental test programme, that investigated the stiffness of nonstandard, 3.00 × 3.00 m sized diaphragm configurations for in-plane static load. The experimental results are compared against analytical results derived from calculated shear flexibilities according to current ECCS formulae. Upon experimental test results, a verified and validated numerical model is developed, and the range of experimental tests is extended by numerical simulations. The conclusions of numerical analyses demonstrated, that the effect of purlin section height and thickness is not followed by current ECCS provisions. The intended purpose of the research is to develop the current ECCS stressed skin design formulae to incorporate nonstandard diaphragm constructions, which are commonly used in industrial practice in Europe. The innovative feature of formulae improvement is to comprise the effect of those parameters, which are influencing shear flexibility and are not addressed in the current ECCS design methodology. Upon experimental, analytical and numerical results a modification is presented to current formulae of shear flexibility, which gives a better approach in nonstandard cases. • Experimental panel test series was conducted in order to examine the stiffening effect of commonly installed diaphragm configurations. • The main objective of the research is to examine nonstandard diaphragm constructions, in which seam fasteners are omitted. • To date no international study was performed to examine the stiffening effect of nonstandard steel diaphragms. • Upon experimental results a FE model was developed and verified, and an extended parametric study was carried out. • Based on these results a proposal is made in order to amend current ECCS formulae to incorporate nonstandard diaphragms. [ABSTRACT FROM AUTHOR]