Compressive behavior of concrete-filled square stainless steel tube stub columns

Peng Dai, Lu Yang, Jie Wang, Keyang Ning and Yi Gang

Abstract

Concrete-filled square stainless steel tubes (CFSSST), which possess relatively large flexural stiffness, high corrosion resistance and require simple joint configurations and low maintenance cost, have a great potential in constructional applications. Despite that the use of stainless steel may result in high initial cost compared to their conventional carbon steel counterparts, the whole-life cost of CFSSST is however considered to be lower, which offers a competitive choice in engineering practice. In this paper, a comprehensive experimental and numerical program on 24 CFSSST stub column specimens, including 3 austenitic and 3 duplex stainless steel square hollow section (SHS) stub columns and 9 austenitic and 9 duplex CFSSST stub columns, has been carried out. Finite element (FE) models were developed to be used in parametric analysis to investigate the influence of the tube thickness and concrete strength on the ultimate capacities more accurately. Comparisons of the experimental and numerical results with the predictions made by design guides ACI 318, ANSI/AISC 360, Eurocode 4 and GB 50936 have been performed. It was found that these design methods generally give conservative predictions to the ultimate capacities of CFSSST stub columns. Improved calculation methods, developed based on the Continuous Strength Method, have been proposed to provide more accurate estimations of the ultimate resistances of CFSSST stub columns. The suitability of these proposals has been validated by comparison with the test results, where a good agreement between the predictions and the test results have been achieved.

Key Words

compressive behavior; concrete-filled square stainless steel tubes; Continuous Strength Method; parametric study; stub column tests

Address

Peng Dai:1)The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China 2)Beijing Engineering Research Centre of High-rise and Large-span Prestressed Steel Structures, Beijing University of Technology, Beijing 100124, China Lu Yang:1)The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China 2)Beijing Engineering Research Centre of High-rise and Large-span Prestressed Steel Structures, Beijing University of Technology, Beijing 100124, China Jie Wang:Department of Architecture and Civil Engineering, University of Bath, Bath BA2 7AY, U.K. Keyang Ning:1)The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China 2)Beijing Engineering Research Centre of High-rise and Large-span Prestressed Steel Structures, Beijing University of Technology, Beijing 100124, China Yi Gang:1)The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China 2)Beijing Engineering Research Centre of High-rise and Large-span Prestressed Steel Structures, Beijing University of Technology, Beijing 100124, China

← Back to Volume 42, No. 1