Experimental behavior and design method of rectangular concrete-filled tubular columns using Q460 high-strength steel

• Published in: Construction & building materials 2016-10, Vol.125, p.856-872
• Main Authors: Du, Yansheng, Chen, Zhihua, Xiong, Ming-Xiang
• Format: Article
• Language: English
• Subjects: Analysis; Augmentation factor; Concrete; DB 29-57; High-strength steel; New design method; Properties; Rectangular CFT columns; Steel, High strength; Width-to-thickness ratio
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2016.08.057

•New test data for rectangular CFT columns using Q460-grade steel is reported.•A comprehensive database with 241 test results is established.•Augmentation factor is proposed to evaluate the effect of high-steel strength.•A new method of designing rectangular CFT columns is proposed and verified.•Steel strength limitation in DB 29-57 can be safely extended to 460MPa. This paper experimentally and theoretically investigates the behavior of rectangular concrete-filled tubular (CFT) columns using Q460-grade steel. Analysis of concrete contribution ratio (CCR), ductility and strength index (SI) was performed based on the experimental results. Finite element analysis was conducted to predict the behaviors of the test columns and to choose the suitable steel material model for Q460-grade steel. A comprehensive database including this study was established to evaluate the current design approaches for rectangular CFT columns using high steel strength (HSS). Augmentation factor is proposed to evaluate the effect of both the width-to-thickness ratio and the HSS. A new design method was developed and verified to extend the steel strength limitation for designing rectangular CFT columns to 460MPa in DB 29-57 based on this research.