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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Experimental Fire Resistance Test of Timber Structure
 Žajdlík, Tomáš ; Šuhajda, Karel
Wooden materials have many advantages for their use in buildings. There are many limitations for their use as with other materials. It's because of the mechanical-physical properties of natural wood. With the use of the wooden structure of the building, the fire load is increased and the requirements for the fire safety solution are stricter. The combustible load-bearing structure influences the design of the building in terms of its function, layout solution, structural materials, and fire safety equipment. The data of the behaviour of wooden materials in the event of fire are necessary for the correct design a timber structure with the required fire resistance. This paper is focused on experimental testing of timber structures exposed to extreme situations such as the effects of fire.
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The effect of chemical degradation of surface layers on mechanical properties of wood
 Drdácký, Miloš ; Kloiber, Michal ; Frankl, Jiří ; Bryscejn, Jan ; Tippner, J.
The aim of the research was the determination of the effect of chemical degradation on the surface layers of wooden constructional elements and their mechanical properties and also the depth which the damage reaches. The degradation of wood surface layers was caused by chemical reactions of some compounds contained within fire-prevention coatings applied repeatedly on wooden constructions of historic buildings in the past. These include e.g. ammonium sulphate and ammonium phosphate. This paper presents experimental procedures and results obtained through measuring of mechanical properties in the damaged layer of fibrillated wood and in wood without damage. The observed properties were wood compressive and tensile strength and wood hardness. The results proved a loss in cohesion and changes in mechanical properties only in a thin surface layer.
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Chemical corrosion wood
 Holan, J. ; Kloiber, Michal
Chemical corrosion of wood is caused by acids, bases, and salts. Primary manifestations are changes color, next stage is defiberation of wood surface (into a few centimeters). It causes decrease of mechanical properties. Damaged structures (i.e. roof frame) are not capable enough to bear required loads and there is a threat of crash down. Improper use of preservatives on wood can induced process of corrosion what is apparent on some Czech monuments.
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