Cyclic tests on R/C frame retrofitted with K-bracing and shear-link dissipator
Older buildings, designed without considering earthquake provisions, constitute a significant hazard in many cities of southern Europe. Such buildings, commonly constructed as RC frames with brick-masonry infilled walls, are mostly retrofitted by strengthening either the RC columns or the infilled panels or both. However, strengthening walls may lead to an overloading of the existing foundation under future earthquakes. An alternative strengthening solution to be considered is the introduction of ductile steel eccentrically braced assemblies with vertical shear links replacing at each floor level one or more of the infilled panels. In this case, overloading of the foundation can be minimised and a substantial increase in the ductility and drift capacity can be achieved. In fact, cyclic shear-strain hardening of the link increases the lateral resistance of the link under increasing lateral displacements and thus compensates for the loss of resistance of the infilled walls under cyclic deterioration. The design concept is illustrated by a design example and experimental test results support the system feasibility.
Bibliographic Reference: EUR 20136 EN (2001), pp.71. Euro: Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail: email@example.com
Record Number: 200214440 / Last updated on: 2002-02-20
Original language: en
Available languages: en