Experimental and numerical investigations of recycled aggregate concrete-filled stainless steel tube stub columns under combined compression and bending. (1st September 2022)

• Record Type: Journal Article
• Authors: Zhong, Yukai; Zhao, Ou; Young, Ben
• Is Part Of: Engineering structures. Volume 266(2022)
• Publication Date: 2022-09-01
• Subjects: Combined compression and bending -- Design codes -- Eccentric compression tests -- Material testing -- Numerical modelling -- Recycled aggregate concrete-filled stainless steel tube; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2022.114502
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: The structural behavior and capacity of RACFSST stub columns under combined loading are studied. Twelve eccentric compression tests on RACFSST stub columns are conducted. The evolution of neutral axis in RACFSST composite section as well as the confinement effect are discussed. FE models are developed to validate against the test results and then used to conduct parametric studies. The relevant design codes are assessed against the test and FE data. Abstract: This paper reports experimental and numerical investigations into the behaviour and resistance of recycled aggregate concrete-filled stainless steel tube stub columns under combined compression and bending. Eccentric compression tests were conducted on twelve stub column specimens fabricated from austenitic stainless steel tubes with two cross-section sizes and concretes with three recycled coarse aggregate replacement ratios (0%, 35% and 70%). The test results, including the failure loads, load–mid-height lateral deflection curves, evolution of neutral axis and confinement effect, were discussed in detail. The testing programme was followed by a numerical modelling programme, where finite element models were developed and validated against the test results and then used to perform parametric studies to generate further numerical data over a wide range of cross-section dimensions and loading combinations. Given that there are no existing design codes for recycled aggregate concrete–stainless steel composite structures, the relevant codified design rules for natural aggregate concrete filled-carbon steel tube stub columns under combined compression and bending, as set out in the European code, American specification and Australian/New Zealand standard, were evaluated for their applicability to recycled aggregate concrete filled-stainless steel tube stub columns, based on the test and numerical data. The evaluation results revealed that the European code and Australian/New Zealand standard generally provide an acceptable level of design accuracy, while the American specification yields unduly conservative failure load predictions.