National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Creep of oak dowel: various loading and environmental conditions
Hasníková, Hana ; Kunecký, Jiří ; Hataj, M.
For research of timber joints, the crucial role in force distribution inside the joint is played by distribution and variability of stiffness of the dowels. Not only the instant stiffness, but the one that we can encounter after some longer period. Also, this value and its statistical distribution is influenced by many other factors, however, humidity and temperature are in timber (oak) dowels of utmost importance. In the work results of a creep experiment made using a special testing rig is presented. It has been found, that biggest changes in creep behavior are in case if very humid conditions are present, and, also, that cycling the temperature in high humidity conditions can produce about 104% of the original instantaneous displacement. The result is not surprising, however, new insights are made thanks to relatively high number of samples and ability to produce some statistics. Another outcome is relation of dowel stiffness in time to the level of applied stress, which is quantified in the article.
The research of wooden dowel-type connectors
Kunecký, Jiří ; Hasníková, Hana ; Hataj, M. ; Milch, J. ; Tyrová, M. ; Suchomelová, P.
The carpentry joints, some of them secured by wooden connectors, are part of historical timber roof structures. Originally, a wooden dowel rather secured the position of timber elements in a joint than transferring loads (e.g. dovetail joints). But in some joints it can also transfer the forces between the structural members, therefore its behaviour influences the stiffness and load-bearing capacity of the whole structure directly. This type of connectors can be used nowadays as well; while reconstructions, a new timber building construction, or manufacturing individual structural timber elements (e.g. panels). Current technical standards do not prescribe a suitable computing procedure for the joints with wooden connectors. Moreover, a complex failure criteria for various fibre directions are missing. The article introduces an ongoing project, whose ambition is to cover the knowledge gap.

Interested in being notified about new results for this query?
Subscribe to the RSS feed.