Strength of connections in precast concrete structures

Abstract

The available experimental and numerical results of many studies of behavior of reinforced concrete connections for different stages of loading, up to fracture loading, are presented and analyzed in this paper. The problem of beam-column connection (or plate-wall connection) in prefabricated monolithic structures is emphasized. Fracture mechanisms of RC structures, the theoretical basis for their analysis, and the use of fracture mechanics in RC structures were also considered, as well as the mathematical models of prefabricated connections. In order to formulate an adequate mathematical model for calculating the connections, the dominant parameters influencing the behaviour of these connections were analyzed. A failure model for the prefabricated wall - monolithic RC plate connection was formulated. In building the model, the results of implemented experimental and numerical research of prefabricated connection in the MMS system from 2007 were used. Experiences with the implementation of the aforementioned construction system in structures in Tuzla, in the 1980's last century, were additionally used. The proposed mathematical models provide a sufficiently accurate failure assessment of prefabricated reinforced concrete connections.Dostupni eksperimentalni i numericki rezultati mnogih istrazivanja ponasanja armiranobetonskih spojeva za razlicite nivoe opterecenja, sve do opterecenja loma, prezentirani su i analizirani u ovom radu. Istaknut je i problem spojeva greda-stub (ili ploca-zid) u montazno - monolitnim konstrukcijama. Teoretske osnove za analizu mehanizama loma u AB konstrukcijama i koriscenje mehanike loma pri tome sazeto su prikazana. Razmatrani su neki matematicki modeli za opisivanje ponasanja karakteristicnih montaznih veza. Da bi se formulisao adekvatan matematicki model za proracun spojeva analizirani su dominantni parametri koji uticu na ponasanje tih spojeva. Formulisan je otkaz spoja montaznog zida - monolitne AB ploce. Kod formiranja modela korisceni su rezultati sprovedenih eksperimentalnih i numerickih istrazivanja montazne veze MMS sistema iz 2007. godine. Takodje su koriscena iskustva u implementaciji prethodno spomenutog sistema gradnje u Tuzli iz 1980-ih godina proslog veka. Predlozeni matematicki modeli pruzaju dovoljno tacne procene nosivosti montaznih armiranobetonskih spojeva. PR Projekat Ministarstva nauke Republike Srbije, br. TR 36043