The Investigation on Mechanical Performances of High-Strength Steel Reinforced Concrete Composite Short Columns under Axial Load

Abstract

At present, the existing standards (AISC360-16, EN1994-1-1:2004, and JGJ138-2016) lack relevant provisions for steel-reinforced concrete (SRC) composite columns with high-strength steel. To investigate the axial compressive mechanical performance of short high-strength steel-reinforced concrete (HSSRC) columns, the axial load test was conducted on 12 short composite columns with high-strength steel and ordinary steel. The influences of steel strength, steel ratio, and the section form of steel on the failure modes, bearing capacity, and ductility of the specimens were studied. Afterward, the experimental data were compared with the existing calculation results. The results show: compared with the specimens with Q235 steel, the bearing capacity of the specimens with Q460 steel increases by 7.8–15.3%, the bearing capacity of the specimens with Q690 steel increases by 13.2–24.1%, but the ductility coefficient increases by 15.2–202.4%; with the increase of steel ratio, the bearing capacity and ductility of specimens are significantly improved. A change of the steel cross-section could influence the ductility of SRC columns more than their bearing capacity. Moreover, the calculation results show that present standards could not predict the bearing capacity of HSSRC columns. Therefore, a modified method for determining the effective strength of steel equipped in HSSRC columns was proposed. The results of the ABAQUS simulation also showed that the addition of steel fibers could significantly improve the bearing capacity of Q690 HSSRC columns. The research results provide a reference for engineering practices.

Nonlinear analysis of square steel‐reinforced concrete‐filled steel tubular short columns considering local buckling

“…This is because the highstrength concrete employed in constructing these columns has brittle nature. [1][2][3] In addition, the construction process of high-strength SRC columns and beam-column connections, which requires the use of formwork, is time-consuming and challenging. 4 Moreover, the formwork must be meticulously constructed and maintained to ensure that the concrete is properly placed and cured, which significantly increases construction costs.…”

“…Despite their numerous benefits, previous studies have indicated that high‐strength SRC columns exhibit poor ductility. This is because the high‐strength concrete employed in constructing these columns has brittle nature 1–3 . In addition, the construction process of high‐strength SRC columns and beam‐column connections, which requires the use of formwork, is time‐consuming and challenging 4 .…”

Modeling and Calculation of Improved Centrifuged Reinforced Concrete Columns with Variotropic Structure

“…Many works are devoted to the study of the behavior of concrete and reinforced concrete columns under axial loading [29][30][31][32]. At the same time, numerical simulation methods [33][34][35], experimental methods [31], and complex methods are widely used to confirm the created models [29,30,[36][37][38][39][40][41][42]. The material of the columns is also quite diverse in these studies.…”

“…The material of the columns is also quite diverse in these studies. This can be ordinary reinforced concrete [29,30,32], high-strength concrete [31], high-strength steel-reinforced concrete [30,36], reinforced concrete from steel pipes with concrete filling [33][34][35]38,40,41], other types of concrete (fiber-reinforced, geopolymer [39], fiberglass [37], and others with various formulation solutions). Differences in existing studies also lie in the size of the columns.…”

“…Differences in existing studies also lie in the size of the columns. The objects of simulation and experimental study were both full-sized [35] and short [36] columns. In addition, mechanical [36] and operational [37] characteristics of columns under the action of axial load were calculated.…”