Abstract
To provide references for the use of fabricated thin-walled cold-formed steel tubular lightweight concrete columns, the axial compression tests were conducted on single-limb and double-limb specimens. The results were compared with hollow specimens to analyze the effects of the cross-sectional size of the members, wall thickness, and steel ratio of the sections on the axial load-bearing capacity of the specimens. The test results show the following: 1) under the axial load, the typical damage of the specimens is local buckling of the steel tube and local crushing of the concrete. 2) The ultimate bearing capacity of the double-limb specimen is the highest. For the specimen with the sectional height-width ratio of 1.43, the ultimate bearing capacity of the double-limb specimen is 275.71% higher than that of the hollow steel tubular column and 241.49% that of single-limb specimens. 3) Based on the material superposition strength theory, the calculating method of the axial load-bearing capacity of thin-walled cold-formed steel tubular lightweight concrete columns was proposed and verified by comparing with the test results, which provides the design guidance for such members.
Highlights
Compared with the traditional reinforced concrete structure, the fabricated thin-walled cold-formed steel tubular lightweight concrete columns have the advantages of high bearing capacity, ready construction, and good economic efficiency (Cai, 2003)
When the load was close to the ultimate bearing capacity of the single-limb specimen, the sealing steel plate buckled between the tapping screws at the upper end of the specimen
The main factors affecting the bearing capacity and ductility performance of the combined columns were investigated through the axial compression load test on 12 fabricated thin-walled cold-formed steel tubular lightweight concrete columns
Summary
Compared with the traditional reinforced concrete structure, the fabricated thin-walled cold-formed steel tubular lightweight concrete columns have the advantages of high bearing capacity, ready construction, and good economic efficiency (Cai, 2003). The steel tube and concrete work together in the fabricated thin-walled cold-formed steel tubular lightweight concrete columns, which can effectively delay the buckling of the steel tube wall, enhance the ductility and load-bearing capacity of the members, and make the structures have good seismic performance. Skalomenos et al (2016) conducted horizontal load tests on circular thin-walled steel tube concrete columns and found that the yield strength of the steel had a significant effect on the ductility and horizontal bearing capacity of the specimens. Li (2017) conducted the axial compression experiment of high-strength concrete-filled cold-formed steel tube columns and obtained the calculation formula of the bearing capacity. The main factors affecting the bearing capacity of the members were analyzed, and the calculation method for the bearing capacity of the members was proposed, which would provide support for the application of such members
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
