NEHRP Clearinghouse

Title
Seismic Strengthening of a Reinforced Concrete Frame Using Structural Steel Bracing.
File
PB87148169.pdf
Author(s)
Jones, E. A.; Jirsa, J. O.
Source
National Science Foundation, Washington, DC. Directorate for Engineering., May 1986, 159 p.
Identifying Number(s)
PMFSEL-86-5
Abstract
A two-thirds scale model of two bays and two stories of the exterior moment resisting frame of a reinforced concrete building was constructed. The test specimen, which had deep spandrel beams and short narrow columns, was strengthened with an exposed structural steel diagonal bracing scheme in order to increase the lateral capacity of the structure for earthquake loads. Construction and fabrication of the strengthening scheme are discussed. The model was subjected to reversed, cyclic loads producing maximum interstory drifts of 1.3 percent. The behavior of the model is discussed, with special emphasis on the load-drift relationships of the frame.
Keywords
Braces; Buildings; Earthquake engineering; Reinforced concrete; Cyclic loads; Buckling