Analysis of mechanical performance of steel reinforced reactive powder concrete columns under large eccentric loading

Abstract

In order to study the mechanical performance of steel reactive powder concrete (RPC) columns under large eccentric loading, large-scale eccentric compression tests were carried out using full-scale test pieces. Six steel RPC columns with section size of 300 mm×350 mm and height of 3 000 mm were fabricated for large-capacity bearing capacity performance tests. The force process and failure modes were observed, and the ultimate bearing capacity, lateral deflection and section strain were obtained. The test results show that the composite structure has high bearing capacity and good deformation capacity, and the compression zone of RPC basically conforms to the assumption of flat section. The ultimate bearing capacity of the column increases with the increase of steel ratio and decreases with the increase of eccentricity. Based on the assumption of flat section, the calculation formula of the ultimate bearing capacity of the full-scale steel reinforced RPC column is established by considering the contribution of the tensile stress of the RPC in the tension zone of section, which can be used as a reference for engineering design.