Flexural behavior of high strength concrete filled high strength square steel tube: Fid-Bau Portal

Flexural behavior of high strength concrete filled high strength square steel tube

Li, Guochang / Liu, Di / Yang, Zhijian / Zhang, Chunyu

AbstractTo study the mechanical behavior of high-strength concrete filled high-strength square steel tube (HCFHST) under pure bending load, six specimens with different steel ratio were tested. The corresponding nonlinear finite-element models were established to analyze the mechanical properties. The load-displacement curves obtained from the numerical analyses are consistent with the experimental results. In addition, the influences of different materials are analyzed in this paper. The moment-curvature relationship can be divided into three stages: elastic stage, yield stage and hardening stage. And the ultimate bearing capacity increased with the steel ratio, steel yield strength and concrete compressive strength. Moreover, the ultimate bearing capacity of the experiment and finite-element analysis (FEA) model is compared with the requirements of codes: AISC-LRFD (1999), AIJ (1997), EC4 (1994) and GB50936-2014 (2014). The test and FEA result were the most compatible to the calculated result of EC4 (1994). And find the results in this paper is the most compatible to the code EC4 (1994).

Highlights•The test specimens are manufactured with high strength concrete (C100) and high strength steel (Q460).•The effects of steel ratio, yield strength and concrete compressive strength are considered.•The proportion of bear the bearing capacity of each component is studied by finite element analysis.•Different codes are used to calculate the ultimate bearing capacity of the test specimens and FEA models.