Mislav Stepinac

Glued-in rods in beech laminated veneer lumber

Beech laminated veneer lumber is a new engineered wood product with superior mechanical properties and high density. In order to take advantage of this superior mechanical performance in the case of connections with glued-in rods a series of pull compression tests with different angles to the grain have been performed applying both polyurethane and epoxy resin as adhesives. No influence of the grain angle on the load carrying capacity could be found. In addition, a survey on design rules and their acceptance in practice has been carried out, showing a clear need for further standardization.

Kompozitni sustavi drvo - nosivo staklo u potresnom okruženju

Nosivo staklo u kombinaciji s drvenim okvirom predstavlja kompozitni sustav koji ima predispozicije za dobro ponasanje prilikom potresa, istovremeno je energetski efikasno i isplativo, estetski prihvatljivo te ima dobre nosive karakteristike. U novije vrijeme provedeno je nekoliko istraživanja kompozitnih sustava drvo – nosivo staklo te se prema rezultatima tih ispitivanja mogu odrediti osnovne smjernice daljnjih istraživanja.

Influence of long term load on timber-concrete composite systems

Timber-concrete composite systems represent a very good technical solution both in reconstruction activities and in construction of new buildings. The design of such systems is currently conducted using the γ procedure defined in Eurocode 5. The long-term behaviour of such composites is a highly complex problem depending on the creep, swelling, shrinkage and thermal changes within concrete, creep and moisture content in wood, and creep of the connection itself. The design of composite systems according to current regulations is incomplete in some conditions, and there is ample room for improving the existing European standards and regulations.

Pregled i ocjena stanja postojećih drvenih konstrukcija

Ocjena stanja i kontinuirano praćenje ponašanja postojećih drvenih konstrukcija u posljednje vrijeme sve više dobivaju na značaju. Globalni cilj održivog razvoja u velikoj mjeri usmjeren je na očuvanje postojećih konstrukcija i zaštitu graditeljske baštine. U radu su prikazane metode ocjenjivanja stanja postojećih drvenih konstrukcija. Glavni naglasak stavljen je na prikaz nedestruktivnih i poludestruktivnih metoda za drvene konstrukcije koje su često u uporabi. U radu su navedene metode na konkretnom primjeru ocjene stanja Tehničkog muzeja Nikole Tesle u Zagrebu.Condition assessment and continuous monitoring of the existing timber structures have been gaining in importance in recent times. The global objective of sustainable development has been greatly directed toward preservation of the existing structures and protection of architectural heritage. Methods used for assessing condition of the existing timber structures are presented in the paper. The main emphasis is placed on the presentation of non-destructive and semi-destructive methods for frequently used timber structures. The methods are presented through the example of condition assessment of the Nikola Tesla Technical Museum in Zagreb.

Inspection and condition assessment of existing timber structures

Ocjena stanja i kontinuirano praćenje ponašanja postojećih drvenih konstrukcija u posljednje vrijeme sve više dobivaju na značaju. Globalni cilj održivog razvoja u velikoj mjeri usmjeren je na očuvanje postojećih konstrukcija i zaštitu graditeljske baštine. U radu su prikazane metode ocjenjivanja stanja postojećih drvenih konstrukcija. Glavni naglasak stavljen je na prikaz nedestruktivnih i poludestruktivnih metoda za drvene konstrukcije koje su često u uporabi. U radu su navedene metode na konkretnom primjeru ocjene stanja Tehničkog muzeja Nikole Tesle u Zagrebu.Condition assessment and continuous monitoring of the existing timber structures have been gaining in importance in recent times. The global objective of sustainable development has been greatly directed toward preservation of the existing structures and protection of architectural heritage. Methods used for assessing condition of the existing timber structures are presented in the paper. The main emphasis is placed on the presentation of non-destructive and semi-destructive methods for frequently used timber structures. The methods are presented through the example of condition assessment of the Nikola Tesla Technical Museum in Zagreb.

Timber-structural glass composite systems in earthquake environment

Nosivo staklo u kombinaciji s drvenim okvirom predstavlja kompozitni sustav koji ima predispozicije za dobro ponasanje prilikom potresa, istovremeno je energetski efikasno i isplativo, estetski prihvatljivo te ima dobre nosive karakteristike. U novije vrijeme provedeno je nekoliko istraživanja kompozitnih sustava drvo – nosivo staklo te se prema rezultatima tih ispitivanja mogu odrediti osnovne smjernice daljnjih istraživanja.

Computer-based analysis of spatial frames according to second order theory

Nosivo staklo u kombinaciji s drvenim okvirom predstavlja kompozitni sustav koji ima predispozicije za dobro ponasanje prilikom potresa, istovremeno je energetski efikasno i isplativo, estetski prihvatljivo te ima dobre nosive karakteristike. U novije vrijeme provedeno je nekoliko istraživanja kompozitnih sustava drvo – nosivo staklo te se prema rezultatima tih ispitivanja mogu odrediti osnovne smjernice daljnjih istraživanja.

Learning from Case Studies: Timber Tower of Gospić Cathedral and Traditional Timber Church

The conservation of historical timber structures requires both the knowledge of structural behavior of complete building and behavior of any single element in structure. Because of a poor communication between the institutions involved in the conservation and restoration of buildings and institutions that urgently require renovation of structures, renovation of historic buildings is often performed inappropriately due to engineering and architectural approach. Buildings are frequently subjected to inappropriate interventions, replacements of structural elements, or even worse, they are demolished. First case study in this paper is Cathedral from Gospic city which was subjected to inappropriate reconstruction in 1990s. Second case study is small traditionally constructed timber chapel in village Lijevi Stefanki which represents a valuable monument of rural cultural heritage.

Reconstruction of the Technical Museum in Zagreb

Technical Museum is one of the most visited Museums in Zagreb (capital of Croatia). The museum presents scientific and educational centre in the field of technical sciences. The entire structure of the Museum is constructed as a timber structure and as such represents a rare existing example of the European engineering concept of expo-halls timber structures with large span (85m x 40 m) from the early 20 century. In this article overview of different NDTs that were performed in order to assess the structural performance of elements is given; moisture ratio and ultrasound investigations are carried out in situ in order to investigate timber condition. Based on the detected state of the structure reconstruction measures are presented.