Simulated seismic loading on reinforced concrete beam/column connections

Abstract

Laboratory tests to investigate the seismic behaviour of five reinforced concrete external beamlcolumn connection specimens, by subjecting the beams to a series of slow load reversals, are described. The first three tests were undertaken as an extension of a static (non‐seismic) test programme and were primarily carried out for the purposes of rig development. The two further test specimens contained additional links in the connection zone to make them representative of current seismic practice in the U.S.A. These two specimens were subjected to a series of slow load reversals specifically intended to simulate seismic effects. With the first three specimens, complete destruction of the connection zone was achieved after only four or five cycles; the last two specimens withstood ten and twelve cycles respectively. One of these latter specimens failed due to the development of a plastic hinge at the beaml column junction, the other by plastic hinges forming in the column above and below the beam. Detailed information regarding the form of the reinforcement strain distributions developed during these tests is presented, data being obtained using reinforcement internally strain gauged with electric resistance strain gauges. Each specimen contained around 230 such gauges.

Finite Element Analysis of Beam – Column Joints Reinforced with GFRP Reinforcements

“…Table 5 shows the experimental database used in this study. The database comprises the results obtained in our laboratory and the other researchers like Ortiz [31], Kordina [32], Scott [33], Scott & Hamill [34], Taylor [35], and Parker & Bullman [36]. The specimen forms included in the database are shown in Figure 24 (a, b, c) shows the notations used in this study The theoretical expressions for the exterior beam-column joint reinforced with GFRP reinforcements.…”

Estudo teórico-experimental do comportamento de nós de pórtico de concreto armado submetidos a ações cíclicas

“…No caso de ligações submetidas a carregamentos monotônicos, foram analisados os dados experimentais de 27 ligações, apresentados em VOLLUM & NEWMAN (1999) e referentes aos ensaios conduzidos por ORTIZ (1997), KORDINA (1984), TAYLOR (1974), SCOTT (1996), SCOTT & HAMIL (1998) e WILSON (1998).…”

“…Na tentativa de perceber a real a influência da força normal, foram analisados resultados experimentais de 48 ligações viga-pilar de extremidade, no caso de ações cíclicas, referentes aos ensaios de HANSON & CONNOR (1967), HANSON (1971), LEE et al (1977), EHSANI & WIGHT (1985), ALAMEDDINE & EHSANI (1991), KAKU & ASAKUSA (1991) e FUJII & MORITA (1991. No caso de ações monotônicas, foram analisados os resultados de 28 ligações viga-pilar de extremidade ensaiadas por ORTIZ (1997), KORDINA (1984), TAYLOR (1974), SCOTT (1996), SCOTT & HAMIL (1998) e WILSON (1998).…”