Last modified: 17-04-2018

#### Abstract

The current AISC Specification (AISC 360-16) specifies the material strength limits for concrete-filled steel tube (CFT) columns. According to AISC 360-16, the steel yield stress (*F _{y}*) for CFT columns should not exceed 525 MPa, and the concrete compressive strength (

*f’*) should not exceed 70 MPa. CFT columns are classified as high strength if either

_{c}*F*or

_{y}*f’*exceeds these specified limits, and are classified as conventional strength if both

_{c}*F*and

_{y}*f’*are less than or equal to the limits. Due to lack of adequate research and comprehensive design equations, AISC 360-16 does not endorse the use of high-strength materials for CFT columns. This paper makes a contribution towards addressing this gap using a two-step approach. The first step consists of compiling an experimental database of high-strength rectangular CFT column tests in the literature and evaluating the possibility of extending the current AISC 360-16 design equations to high-strength rectangular CFT columns. The second step consists of developing and benchmarking detailed 3D nonlinear finite element models for predicting the behavior of high-strength CFT columns from the database. The benchmarked models are being used to perform comprehensive parametric studies to address gaps in the database and propose design equations for high-strength rectangular CFT members, which will be part of a future paper.

_{c}