Experimental studies on axial load performance of high-strength concrete short columns

Abstract

This paper presents the results of an experimental investigation into the axial load performance of steel-reinforced high-strength concrete short columns. The performance of a total of ten specimens is investigated, including the failure pattern, load-strain response, compressive strength and ductility. The parameters considered in this study are stirrup and structural steel arrangements. The definition of effective strength is developed to measure the compressive strength of columns due to the sudden drop of strength at peak. The ductility of columns is characterised by the ratio of after-peak and before-peak area under the curve of the axial load plotted against axial strain. Based on the experimental research, it is found that stirrups affect ductility and residual strength of columns, but not the peak strength. Structural steel influences the peak and residual strength and ductility of columns. Ductility of columns is approximately proportional to the effective confinement index if stirrups yield after peak. The effect of structural steel on ductility is more obvious when the effective confinement index is larger.

Seismic behaviour of steel-reinforced ultra-high-strength concrete composite frame: Experimental study

“…It is a critical region in high-rise buildings that were often subjected to inelastic response under severe seismic loading. As reported (Jia et al, 2013; Liu and Jia, 2017; Zhu et al, 2013), the research results indicated that encasing structural steel and high-strength stirrups into the ultra-high-strength concrete columns can significantly increase the curvature ductility of sections and axial compression capacity.…”

Experimental study on the seismic behavior of steel-reinforced ultra-high-strength concrete frame joints with cyclic loads

“…Ultra-high-strength concrete is generally defined as having a 28-day uniaxial compressive strength in excess of 100 MPa for the standard 150 mm × 150 mm test specimens (Pu et al, 2002). In comparison to ordinary-strength concrete, the ultra-high-strength concrete exhibits superior compressive and tensile mechanical behaviors and exceptional durability properties and economic efficiency (Zhu et al, 2014). Hence, the ultra-high-strength concrete has been extensively utilized in hybrid structures.…”

Non-linear Analysis of Slender High Strength Concrete Column

“…Interest in a deeper knowledge on the behavior of these complex structural elements has currently increased. Recently lab tests have been carried out not only on NSC slender columns [6] but also on HSC short [7] and slender columns [8,9]. Results of work of Barrera et al [10] confirm that reduced axial load decreases for an increase of the concrete strength and slenderness of the specimen.…”