The paper presents current trends in the development of the wood-framed structures. Authors describe the evolution of the technology of implementation, the production process of precast elements of buildings as well as selected realization on the site of these kinds of structures. The attention has been paid to the effect of implementation phases on construction and erecting technology of the wood-framed structures. The paper draws attention to the importance and enhancement of structural analysis of structures in individual phases of building realization.

The aim of the paper is to present the state of the building erected in the OWT technology. The construction of the building has not been completed due to the financial problems of the late 90's of the XX century. As a result of the long-term environmental impact, the object was degraded due to the lack of a flat roof and windows. The impact of precipitation, wind and biological corrosion led to significant degradation and deterioration of structural elements and joints. The paper will present examples of damage caused by environmental impacts. Examples of damage of wall and floor elements as well the deeply corroded steel plate joints will be presented. Highly grown lichens, mosses or mold will be also presented as the examples of biological interactions onto the surface of constructional elements. Structural elements have been tested in a nondestructive manner using sclerometer tests. The results will be described and the conclusions will be presented. The analyzed object presents in an interesting manner that environmental influences could destructively affect the construction of precast RC structural elements, which constitute a significant percentage of the Polish construction market.

Timber structure especially light-wood framed structures depending on semi-rigid behaviour of its work have got lower spatial stiffness than theoretical model with full-fixed joints. Semi-rigid behaviour of the joints is a function of material and structural stiffness. Joints deformation are the results of material properties of wood as well as internal force redistribution onto individual elements intersected in analyzed joint. The force distribution between individual components depends on the direction of the grain in analyzed parts of the structure. Joints deformation as the result of its semi-rigid characteristics cause the reduction of the stiffness so the values of the displacements rise. Increase of the displacement allows possibility to exceed the limits imposed by the requirements of Serviceability Limit State. The exceeding of the safe values causes the structure lost its function due to the safety and comfortable use. The paper will present main concepts connected with non-linear and semi-rigid behavior of the joints as well the models and static schemes of joints work in the light-wood framed structures. The experimental researches were conducted in Bialystok University of Technology. The experiments were carried out on the specimen in micro-scale 1:3. The translational stiffness k and rotational stiffness κ were analyzed. The researches were conducted for stud-to-bottom plate joint as well floor joist-to-top plate of wall joint in the floor to wall connection. There were observed dependencies between the loads applied to the joint and the translational and rotational deformation of the connection. Selected results of these experimental tests present the behavior of the analyzed joints and expose its semi-rigid manner of work. For single-span beam with semi-rigid joints the calculation formulas presenting the change of extreme values of the displacement in relationship to the translational and rotational stiffness of the support joints is presented. The paper will be summarized by conclusions coming from the carried out analyses.