Nail metal connector plate - experimental determination of load-bearing capacity of timber member connections

U radu je prikazano eksperimentalno određivanje nosivosti spojeva ostvarenih čavlastim metalnim spojnicama, koji predstavljaju novo mehaničko spojno sredstvo u drvenim konstrukcijama, čija bi primjena trebala eliminirati nedostatke koje imaju standardni tipovi metalnih spojnica, koje se proizvode perforacijom lima i izvlačenjem zubi izvan ravnine lima. Cilj provedenih eksperimentalnih ispitivanja je bio da se utvrdi nosivost spojeva ostvarenih čavlastim metalnim spojnicama, u skladu s odredbama Eurokoda 5. Eksperimentalno ispitivanje je provedeno na više uzoraka, opterećivanjem uzoraka do dostizanja granične nosivosti spoja izvedenog čavlastim metalnim spojnicama. Diskusija rezultata ispitivanja je obuhvatila analizu granične nosivosti spoja za različite vrijednosti pomicanja spoja, usporedbu dobivenih rezultata s karakterističnom nosivošću standardnih tipova metalnih spojnica i računskom nosivošću čavla po teoriji granične nosivosti. U zaključku je dan komentar o utvrđenim graničnim nosivostima ostvarenih spojeva i zauzet je stav po pitanju dobivenih rezultata, u svrhu unaprijeđenja primjene metalnih spojnica u suvremenim sustavima drvenih konstrukcija.This paper demonstrates the results of experimental determination of load-bearing capacity of structural timber member connections realized by nail metal connector plates which represent a new type of mechanical fasteners in load-bearing timber structures. The application of this type of metal connector should eliminate weakness of the standard metal connector plates produced by sheet perforating and pulling the teeth perpendicular to a sheet plane. The aim of the conducted experimental study was to determine the load-bearing capacity of connections realized by nail metal connector plates, in accordance with the provisions of Eurocode 5. Experimental testing was conducted by loading of multiple samples up to the limit bearing capacity of connection realized by nail metal connector plate. Discussion of the test results included the analysis of the limit bearing capacity of connection for different values of connection displacements, comparison of the obtained results with characteristic load-bearing capacity of standard type of metal connectors and with load-bearing capacity of nails calculated in accordance with limit state theory. Review of the determined limit bearing capacities of realized connections was given in the conclusion, together with the comment on test results, for the purpose of improving the application of metal connectors in modern systems of timber structures