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.
Highlights
With the rapid development of high-rise and long-span buildings, ordinary construction materials do not meet the requirements of modern buildings
To investigate the influence of steel strength, steel ratio, and the section form of steel on the axial compressive bearing capacity of high-strength steel-reinforced concrete (HSSRC) composite short columns, 12 specimens equipped with Q235, Q460, and Q690 were tested
Compared with the specimens equipped with Q235 steel, when the steel grades were Q460 and Q690, the maximum increase in the bearing capacity of the specimens was 15.3% and 19.0%, respec
Summary
With the rapid development of high-rise and long-span buildings, ordinary construction materials do not meet the requirements of modern buildings. Since the 1990s, high-strength materials have increasingly been applied because their use in high-rise buildings can reduce the section size of structural elements and can reduce the use of building materials while saving building space. It is more economical and environmentally friendly. Compared with the normal reinforced concrete columns, steel-reinforced concrete (SRC) columns have better structural performance, which can effectively reduce the cross-sectional size of structural columns and obtain larger building space. The application of high-strength steel to SRC columns aims to improve the bearing capacity of the member without increasing or reducing the sectional area of the vertical member [20,21,22]. Design approaches from standards, including AISC360-16 [40], EN1994-1-1: 2004 [41], and JGJ1382016 [42], are based on the related research results of ordinary steel; the scope of application needs to be verified
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