A Summary of Results of Simulated Seismic Load Tests on Reinforced Concrete Beam-Column Joints, Beams and Columns With Substandard Reinforcing Details

Multi-level seismic rehabilitation of existing frame systems and subassemblies using FRP composites

“…Extensive experimental-analytical investigations on the seismic performance of existing reinforced concrete frame buildings, designed for gravity loads only, as typically found in most seismic-prone countries before the introduction of adequate seismic design code provisions in the 1970's, confirmed the expected inherent weaknesses of these systems (Aycardi et al, 1994;Beres et al, 1996, Hakuto et al, 2000, Park, 2002Pampanin et al, 2002;Bing et al, 2002;Calvi et al, 2002a,b). As a consequence of poor reinforcement detailing, lack of transverse reinforcement in the joint region as well as absence of any capacity design principles, brittle failure mechanisms were observed.…”

Development and validation of a metallic haunch seismic retrofit solution for existing under-designed RC frame buildings

“…Recent experimental investigations on the seismic performance of existing reinforced concrete frame buildings, designed for gravity loads only, as typically found in seismic prone coun-3 tries before the introduction of adequate seismic code provisions in the mid-1970s, have confirmed the expected inherent weaknesses of these systems [1][2][3][4][5][6][7], that have been observed in 5 past earthquake events. Because of the poor detailing of the reinforcement, the absence of capacity design philosophy and the use of plain round reinforcing bars, undesirable brittle failure 7 mechanisms are observed at either the local level (i.e.…”

“…The main variations between construction practices in different seismic-prone countries are related 5 to the percentage of column longitudinal reinforcement, which strongly affects the beam-to-column moment capacity ratio (increasing the tendency of developing soft-storey mechanisms), the different 7 anchorage details in lap splice regions or within joint regions, as well as the minimum spacing of the transverse reinforcement in beams and columns, affecting the shear capacity of the framing 9 elements. Other observed differences are related to the use of shallow and wide beams (typical in Mediterranean countries, abandoned in the late 1950s in NZ) instead of deeper beams, as well as 11 to the type of slab (e.g.…”

Cyclic performance of beam–column joints with extended column fixed at base. Part I: experimental investigation

“…Durrani and Wight, 1985;Ghee et al, 1989;Hanson and Conner, 1967;Jirsa, 1974;Paulay et al, 1978;Saatcioglu and Ozcebe, 1989;Soleimani et al, 1979;Uzumeri, 1977) and many of these previous works aimed to study seismically detailed connections designed according to modern seismic design codes. Studies focusing on underdesigned or substandard members are less common (Aycardi et al, 1994;Beres et al, 1992;Bing and Pan, 2007;Dhakal et al, 2005;Hakuto et al, 2000;Kuang and Wong, 2005;Kunnath et al, 1995;Linzhi et al, 2009;Park, 2002;Pessiki et al, 1990;Supaviriyakit et al, 2007). There are some salient characteristics of under-designed RC frames.…”