Artículo de revista
Confinement behavior of rectangular reinforced concrete prisms simulating wall boundary elements
Fecha
2017Registro en:
Journal of Structural Engineering (United States), Volumen 143, Issue 4, 2017
07339445
10.1061/(ASCE)ST.1943-541X.0001682
Autor
Welt, Travis S.
Massone Sánchez, Leonardo
Lafave, James M.
Lehman, Dawn E.
McCabe, Steven L.
Polanco, Pablo
Institución
Resumen
Observations following recent earthquakes, and from structural testing, indicate numerous brittle compression failures in rein-forced concrete seismic-resisting walls. This is unexpected, as most seismic-resisting walls are designed to be tension-controlled. The prob-lematic compressive response led to two independent studies, each individually aimed at identifying design and loading parameters that affectthe seismic deformability of the compression regions (or boundary elements) of seismic-resisting walls. These experimental studies arecombined here for a more complete understanding. Both studies used axially loaded, rectangular reinforced concrete specimens that simulateseismic-resisting wall boundary elements. The rectangular prisms were tested under cyclic axial loading or monotonic compression, with afocus on the following parameters: boundary element detailing classification, detailing of transverse reinforcement, maximum tensile strainpreceding compressive demand, and cross-sectional aspect ratio. Test results indicate that expected strength and deformation capacity can beoverestimated unless a rectangular hoop restrains every longitudinal reinforcing bar; use of crossties does not guarantee stability of thelongitudinal reinforcement. Tensile strains of 2 and 5%, imposed prior to reaching the compressive capacity, resulted in compression strengthreductions of 20 and 50%, respectively, indicating that load-history can also be important.