Behavior of Plastic-steel Fiber Reinforced Lightweight Aggregate Concrete Columns Subjected to Concentric Axial Loading
- PDF / 4,336,269 Bytes
- 18 Pages / 595.276 x 790.866 pts Page_size
- 96 Downloads / 269 Views
(0123456789().,-volV)(0123456789().,-volV)
RESEARCH PAPER
Behavior of Plastic-steel Fiber Reinforced Lightweight Aggregate Concrete Columns Subjected to Concentric Axial Loading Xu Chen1 • Guohua Xing1 • Jiangang Niu2 • Boquan Liu1 Received: 1 October 2019 / Revised: 14 July 2020 / Accepted: 2 September 2020 Ó Iran University of Science and Technology 2020
Abstract This paper presents the findings of an experimental study on the behavior of plastic-steel fiber (PSF) reinforced lightweight aggregate concrete (LWC) columns under axial compression loading. The experimental variables were concrete compressive strength, main reinforcement percentage, and PSF volumetric ratio. The behavior of the PSF reinforced LWC columns was evaluated in terms of the failure mode, load-bearing capacity, steel reinforcement strain, and ductility. The results showed that the addition of PSFs not only prevented premature spalling of the concrete cover but also strengthened the bond between the LWC and the steel bar. Compared with that of the control specimen, the ductility of the fiberreinforced columns improved significantly. In addition to the experimental program, a numerical investigation based on nonlinear finite element (FE) analysis was performed using ANSYS 10.0. The experimental and numerical results were compared and found to be in satisfactory agreement. Furthermore, an analytical model developed in a previous study was used to predict the load-bearing capacities of the PSF reinforced LWC columns. The compressive strength of concrete, the spacing, and yield strength of transverse reinforcement were considered in the analytical models, and the analytical predictions were in agreement with the experimental results. Keywords Plastic-steel fiber Lightweight aggregate concrete Axial load Ductility Analytical model
1 Introduction Lightweight aggregate concrete (LWC) is used in civil engineering structures, such as large-span bridges, highrise buildings, and oil platforms because of its relatively low density, high strength-weight ratio, and excellent thermal insulation [1, 2]. The main objectives of using & Guohua Xing [email protected] Xu Chen [email protected] Jiangang Niu [email protected] Boquan Liu [email protected] 1
School of Civil Engineering, Chang’an University, 75# Chang’an Road, Xi’an 710064, Shaanxi, China
2
School of Civil Engineering, Inner Mongolia University of Science and Technology, 7# Arding street, Baotou 014010, Inner Mongolia, China
LWC are to reduce the cross-sectional areas of structural members and the dead loads of structures [3, 4]. However, owing to its natural brittleness, LWC typically exhibits low tensile strength and flexural strength [5–7], which affects the durability of LWC structures. As higher strength leads to increased brittleness [8], fiber reinforcement should be considered as an effective method of improving the ductility of LWC [9, 10]. The benefits of applying fiber reinforcement in concrete have been reported in the literature [11–17]. Metallic, synthetic, and na
Data Loading...
