Axial behavior of concrete-filled double-skin tubular stub columns incorporating PVC pipes

• Main Authors: Javed, M.F., Rafiq, H., Khan, M.A., Aslam, F., Musarat, M.A., Vatin, N.I.
• Format: Article
• Published: MDPI 2021
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120040201&doi=10.3390%2fcryst11121434&partnerID=40&md5=43c22789c5bffc97ef178d74bf3c97bc; http://eprints.utp.edu.my/29626/

This experimental study presents concrete-filled double-skin tubular columns and demon-strates their expected advantages. These columns consist of an outer steel tube, an inner steel tube, and concrete sandwiched between two tubes. The influence of the outer-to-inner tube dimension ratio, outer tube to thickness ratio, and type of inner tube material (steel, PVC pipe) on the ultimate axial capacity of concrete-filled double-skin tubular columns is studied. It is found that the yield strength of the inner tube does not significantly affect the ultimate axial capacity of concrete-filled double-skin tubular composites. With the replacement of the inner tube of steel with a PVC pipe, on average, less than 10 strength is reduced, irrespective of size and dimensions of the steel tube. Hence, the cost of a project can be reduced by replacing inner steel tubes with a PVC pipes. Finally, the experimental results are compared with the existing design methods presented in AISC 360-16 (2016), GB51367 (2019), and EC4 (2004). It is found from the comparison that GB51367 (2019) gives better results, followed by AISC (2016) and EC4 (2004). © 2021 by the authors. Licensee MDPI, Basel, Switzerland.