Title: Seismic Retrofit with Continuous Slurry-Infiltrated Mat Concrete Jackets

Author(s): Erdem Dogan and Neven Krstulovic-Opara

Publication: Structural Journal

Volume: 100

Issue: 6

Appears on pages(s): 713-722

Keywords: composite concrete; fiber-reinforced concrete; seismic.

DOI: 10.14359/12837

Date: 11/1/2003

Abstract:
Older concrete frame structures constructed in seismic areas are usually nonductile and, thus, they are identified as hazardous based on current codes. Extensive efforts have been made to develop adequate seismic retrofitting techniques. Developed techniques, however, have not yet taken advantage of high-performance fiber-reinforced concretes (HPFRCs), which can lead to a very high increase in the ability of the structure to dissipate energy—a feature particularly desirable for earthquake-resistant design. The paper presents a novel seismic retrofit technique developed using two types of HPFRCs: slurry-infiltrated fiber concrete (SIFCON) and slurry-infiltrated mat concrete (SIMCON). Continuous SIMCON jackets were used to increase confinement of column lap splices and the joint region, as well as to increase the flexural column capacity. A combination of concrete replacement with SIFCON at the beam bottom facing the joint and SIMCON jacketing of the region was used to improve the anchorage of the discontinuous bottom beam reinforcement. In this exploratory study, a limited number of variables was investigated. Additional experimental and analytical data are needed to fully demonstrate the developed HPFRC-based retrofit method.