Compressive behaviour of built-up hot-rolled steel hollow and composite sections

Abstract

：In this paper, a new type of steel section is proposed comprising adjacent H-sections linked together by intermediate steel plates welded along their flanges. Experiments on three hot-rolled steel built-up H-sections and five columns infilled with concrete are conducted, with results showing that both variants having much better ductility compared to conventional columns (i.e. hollow section columns and concrete filled steel tube (CFST) columns). Experimental results showed that the bearing capacity of the built-up hot-rolled steel hollow section column improved by 45.1% to 55% after it was filled with concrete, and the yield bearing capacities of the specimens ZC-4 and ZC-5 are 26.6% and 17.1% higher than that of ZC-1, which shows that the increase of material consumption can improve the structural behaviour of the specimen. A finite element software ABAQUS is used for parametric study. The newly developed finite element models were validated against test results in terms of failure modes and load-displacement curves. A total of 482 numerical results, 132 hot-rolled steel built-up section columns and 350 concrete-filled built-up section columns, have been generated. Based on the experimental and numerical results, the compressive behaviours of hot-rolled steel built-up section columns and concrete-filled built-up section columns are studied. A new design method for the compression capacity of these two types of columns is proposed. It is found that the newly proposed design method could provide accurate and consistent predictionsthe mean value of predicted to experimental results are0.963 for hollow section columns (with coefficient of variation being 0.061) and 1.04 for composite section columns (with coefficient of variation being 0.043).

Research on bearing capacity of hot-rolled steel combined short columns under eccentric load

“…As can be seen from Table 3, the yield bearing capacity values of the test and FE results are very close, indicating that the FE model can be used to propose the eccentric yield bearing capacity of the columns. The yield bearing capacity was determined by the yield displacement of the load–displacement curve, and the yield displacement was calculated using the Park method (Tan et al, 2019). It can be concluded from the above analysis that the FE models employed in this article were correct and reasonable, which provided the basis for further parametric analysis.…”

“…The hot-rolled steel combined short column is a steel–concrete composite column combined by welding hot-rolled H-shaped steels (Figure 1(a)) and steel plates (Figure 1(b)) and with infilled concrete (Figure 1(c)) (Tan et al, 2019). This type of cross-section columns has the advantages of both combined columns and assembled columns, such as high bearing capacity, avoiding indoor exposed column and high construction efficiency.…”