This paper presents possibilities for anti-seismic improvement of traditional timber\ncarpentry joints. It is known that the structural response of historical roof frameworks is highly\ndependent on the behavior of their joints, particularly, their capacity for rotation and energy\ndissipation. Any strengthening, or retrofitting, approach must take into account conservation\nrequirements, usually expressed as conditions involving minimal intervention. Several retrofitting\nmethods were tested on replicas of historical halved joints within various national and international\nresearch projects. The joints were produced with traditional hand tools, and made using aged\nmaterial taken from a demolished building. The paper presents two approaches, each utilizing\ndifferent retrofitting technologies that avoid completely dismantling the joint and consequently\nconserve frame integrity. The energy dissipation capacity is increased by inserting mild steel nails\naround a wooden pin, and connecting the two parts of the halved joint. In the second case, two thin\nplates made of a material with a high friction coefficient are inserted into the joint and fastened to the\nwooden elements. This is done by removing the wooden connecting pin and slightly opening a slot\nfor the plates between the halved parts. In addition, the paper presents an application for disc brake\nplates, as well as thin plates made of oak.
Loading....