Axial compressive behavior of ultra‐high performance concrete‐filled double skin high‐strength steel tubular short columns

Abstract

In this paper, seven ultra-high performance concrete (UHPC)-filled double skin high-strength steel tubular (UHPCFDST) columns and four UHPC filled high-strength steel tubular (UHPCFST) columns axial compression tests were carried out. The effects of hollow ratio, width-to-thickness ratio of the outer steel tube, and cross-section combination form on the axial compression performance of UHPCFDST were studied, and the failure mode, axial load-strain curve, and strain response were discussed. The results showed that the highstrength steel tube had good compatibility with UHPC, and all specimens finally had serious buckling deformation. The peak load of UHPCFDST specimens decreased with the increase of the hollow ratio, the ductility and toughness were improved. The width-to-thickness ratio of the outer steel tube had the most significant effect on the axial compression performance of the specimens. With the increase of the width-to-thickness of the outer steel tube, the ductility of the specimens tended to increase, and the toughness index first increased and then decreased. Finally, a unified calculation model for the ultimate compressive capacity of UHPCFDST and UHPCFST specimens was proposed, and the predicted value was in good agreement with the experimental value.

Compressive Behavior of Stainless Steel–Concrete–Carbon Steel Double-Skin Tubular (SCCDST) Members Subjected to External Hydraulic Pressure

“…Research on the axial compressive behavior can provide a fundamental reference for their design and construction. Extensive work has been carried out on the axial compressive behavior of conventional CFDSCST members [7,10,11,14,[16][17][18][19][20][21][22][23][24]. Similarly, in order to enhance corrosion resistance, the performance of SCCDST members under concentric compression is gradually being examined [9,12,15,[25][26][27][28][29][30][31].…”

Review of Bond-Slip Behavior between Rebar and UHPC: Analysis of the Proposed Models

“…The thickness of the concrete cover and the bond length are considered to be the primary factors affecting the bond behavior. Many researchers [12][13][14][15][16] had investigated the variations in bond stress with the thickness of the concrete cover and the bond length through pull-out tests and beam-type tests, and the results showed that the ultimate bond strength increased with the relative concrete cover thickness and decreased with the increase in the relative bond length. Deng [17] further studied that the effect of concrete cover thickness weakened if the cover thickness was larger than three times the rebar diameter.…”