Numerical modelling of the behaviour of protected and unprotected wooden members under fire

Sufficient knowledge of the behaviour of wood under fire is necessary for the most effective, the most economical, but still safe design of timber structures. The subsequent numerical modelling leads to new computational methods with higher accuracy. This paper is focused on protected and unprotected wooden members, on the contribution of wooden constructions to fire resistance using calcium-silicate boards. On the basis of the fire test results, the comparison of the fire test results with a numerical model in ANSYS was carried out

THE BEHAVIOUR OF SPECIAL OSB BOARDS UNDER FIRE CONDITIONS, The influence of OSB board´s fire coating on the fire resistance of light timber frame assemblies

The paper is focused on the influence of fire resistant coatings used on OSB boards on the fire resistance of entire light timber frame wall assemblies. Two fire tests were performed in the fire test laboratory of PAVUS, a.s. in Veselí nad Lužnicí. The fire tests were performed on a load bearing wall. The wall dimensions were 3.0 (depth) x 3.0 (height) m. According to EN 1995-1-2, the calculation for fire paints and coatings is not possible. The aim of the paper is the determination of the influence of this type of coating on the OSB board’s charring rate, the determination of the start of charring of a timber stud and the fire resistance of the whole construction

MONITORING AND PROTECTION OF TIMBER-CONCRETE BRIDGES

The majority of timber bridges for ordinary road traffic are often made as timber-concrete composite structures. Concrete slab is something like as umbrella for timber. The reason for problems in timber-concrete bridges is nearly always poor detailing for durability and neglected maintenance. Mainly all aspects of timber protection and maintenance should therefore be considered even during the planning phase of bridge. Paper deals with evaluation of timber properties, system of opto-fiber sensors for monitoring and diagnostics of mechanical stress of timber-concrete bridges, and degradation of timber due to UV radiation, atmospheric conditions and biological agents after application of photocatalytic materials on surface

Navrhování prostorových přípojů dřevostaveb za pomoci kování

There is a significant possibility of improving the load bearing capacities calculated according to the existing Standards of spatial connections with thin walled metal nailing plates. The reason is that the design of these connecting elements has inadequate support in the existing Standards and Technical Reports. The improvement can make them more consistent with the results from tests. Therefore, research has been called to improve this state of the art. The paper presents the whole experimental study of angle brackets which consists of full-scale experiments, numerical models of the connections, current analytical calculation approaches and proposals how to improve them

Metal Work Used in Timber Engineering

There is a significant possibility to increase load bearing capacities of thin walled three-dimensional nailing plates by optimization. Nevertheless design of three-dimen sional nailing plates has an inadequate support in Standards. It is the subject of the Author’s research to improve this state by developing optimization method based on 3D FEM calculation method assisted by testing. This paper is focused on the process of optimization. The paper describes the progress of the experiments, their evaluation and analysis of the results in Abaqus FEM software.

Metal Work Used in Timber Engineering

There is a significant possibility to increase load bearing capacities of thin walled three-dimensional nailing plates by optimization. Nevertheless design of three-dimen sional nailing plates has an inadequate support in Standards. It is the subject of the Author’s research to improve this state by developing optimization method based on 3D FEM calculation method assisted by testing. This paper is focused on the process of optimization. The paper describes the progress of the experiments, their evaluation and analysis of the results in Abaqus FEM software.

Design of Three-Dimensional Nailing Plates

The timber connections using thin-walled metal elements gradually supplant traditional carpentry joints. Their main advantage is that they do not weaken the connected timber elements. Other advantages include the possibility of in-situ implementing and possibility of direct connection of timber elements to steel and concrete structures. The main disadvantage of designing timber connections using thin-walled metal elements is an insufficient support in European Standards. Because of it, it is not possible to design these elements competitively. The aim of this work is to design and investigate metal works used in timber engineering with connectors placed closer to each other than according to the raster from Eurocode 5. This design is based on Annex D of Eurocode0, which allows designing based on experiments

Metal work used in timber engineering

There is a significant possibility of improving the load bearing capacities calculated according to the existingStandards of spatial connections with thin walled metal nailing plates. The reason is that the design of these connectingelements has inadequate support in the existing Standards. The improvement can make them more consistent with theresults from tests. Therefore, research has been called to improve this state of the art. The paper presents an experimentalstudy on two versions of angle brackets where the results from full scale experiments are compared to different calculationprocedures.It is a content of DVD in the book of Abstracts:SEJKOT, P. a KUKLÍK, P. Metal Work Used in Timber Engineering. In: SALENKOVICH, A., ed. WCTE 2014 Book of Abstracts Volume II. The 2014 World Conference on Timber Engineering. Quebec City, 10.08.2014 - 14.08.2014. Quebec: Universite Laval. 2014, s. 51-52. ISBN 978-0-86488-560-9.</p