For constructional purposes reinforcement bars or connecting elements (implants) of a stronger material are installed in concrete, plastic, timber or another similar material‐matrix. Structural concepts are being developed where implants are used both as reinforcing and connecting elements. The implants increase the strength and rigidity of structures. However, investigation of functioning of implants and generalisation of data obtained up to now have been premature. Moreover, they do not help us to understand some empiric facts. In the course of the above‐mentioned tests (data concerning the tests were presented in previously published works), steel bars‐implants with one meter thread were screwed and glued into timber and then attempts to extract them were made. During the test, the bars were screwed into holes in the timber filled with glue. The angle at which the implant was screwed through the layers of wood, the type of glue and some other factors were changed. Such characteristics as strength, strain, breakage and the process of deformation were analysed.

Striving for rationality and long-term reliability is seen in different periods of building activities. Application of linear programming methods has enabled to formalise this striving and to elaborate the necessary mathematical models. But later theoretical and practical investigations have disclosed that not always, when optimising in respect of one criterion, it is possible to obtain solutions rational in other aspects, and this stimulated the application of multicriteria optimization methods. It is useful in this case to apply the ideas of the game theory, game problems solving methods already applied in other building design fields. When adapting methods of the game theory to popular needs for truss designing, a criteria set involving II alternatives has been selected. Attempts have been made to find rational truss variants by applying different methods (method of proximity to an ideal point, Wald's and Hurwitz's methods). It has been found when using the method of proximity to an ideal point for rational truss designing that a truss with a sloping brace network and pivoted knots supported by a column and composed of rectangular box shapes is more valuable than other trusses. According to Wald's and Hurvitz's methods, among popular spans of 24 m such a truss is the truss with a lowered bottom chord. Keywords: rational trusses, multicriteria optimisation, methods of Wald and Hurwitz, method of proximity to an ideal point.

Striving for rationality and long-term reliability is seen in different periods of building activities. Application of linear programming methods has enabled to formalise this striving and to elaborate the necessary mathematical models. But later theoretical and practical investigations have disclosed that not always, when optimising in respect of one criterion, it is possible to obtain solutions rational in other aspects, and this stimulated the application of multicriteria optimization methods. It is useful in this case to apply the ideas of the game theory, game problems solving methods already applied in other building design fields. When adapting methods of the game theory to popular needs for truss designing, a criteria set involving 11 alternatives has been selected. Attempts have been made to find rational truss variants by applying different methods (method of proximity to an ideal point, Wald's and Hurwitz's methods). It has been found when using the method of proximity to an ideal point for rational truss designing that a truss with a sloping brace network and pivoted knots supported by a column and composed of rectangular box shapes is more valuable than other trusses. According to Wald's and Hurvitz's methods, among popular spans of 24 m such a truss is the truss with a lowered bottom chord.

Abundance of metal masts and towers, their aging require to pay attention to corrosion phenomena and their after‐affects. Special attention should be paid to the changes of structural elements strength and strain (induced by the environment aggressiveness) and to the phenomena of viability exhaustion of the whole system (dissipation). In these respects more premises for developing the second limit state formation are found first of all in separate mast elements and local chains, later in the whole structure.The article deals with the premises of developing chemical and electromagnetic contamination, its forecast and processes which could result from the above‐mentioned pollution; it also analyses the destructive processes due to the pollution interaction with the material of structural elements as well as the consequences of aggressive contamination. Attention is also paid to the effect of the stress‐strain concentrations around the corroded spots and their influence on the destruction evolution.

Anotacija. Kauno technologijos universitetas, švęsdamas savųjų ištakų jubiliejų, paminėjo ir pirmojo statybos fakulteto kūrėją, inžinierių, profesorių, dekaną, prorektorių Antaną Bistricką. Buvo atkreiptas dėmesys į tai, kad jo, kaip projektuotojo ir konstruktoriaus, veikla nebuvo aptarta mokslinėje spaudoje. Tačiau mokslininko indėlis plėtojant Lietuvoje nuosaikiojo konstruktyvizmo architektūrinio laikotarpio idėjas ir statybos technologiją turėjo didelės įtakos to meto statybai ir architektūrai. Sostinėje ir mažesniuose miestuose bei gyvenvietėse A. Bistrickas suprojektavo sakralinės paskirties statinių, vienuolynų, gyvenamųjų namų, mokymo įstaigų pastatų. Dėmesį traukia jo išskirtinis darbštumas. Dažniausiai jis pateikdavo 3-5 būsimo objekto projekto variantus. Deja, dėl užsakovo išteklių stokos bei dėl prasidėjusio Antrojo pasaulinio karo ne visi pažangūs konstruktoriaus ir architekto užmojai buvo įgyvendinti.