Performance of fixed beam without interacting bars
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RESEARCH ARTICLE
Performance of fixed beam without interacting bars Aydin SHISHEGARANa, Behnam KARAMIb, Timon RABCZUKc,d* , Arshia SHISHEGARANe, Mohammad Ali NAGHSHf, Mohammreza MOHAMMAD KHANIa a
School of Civil Engineering, Iran University of Science and Technology, Tehran 13114-16846, Iran International Institute of Earthquake Engineering and Seismology, Tehran 19537-14453, Iran c Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Vietnam d Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam e School of Civil engineering, Islamic Azad University, Tehran 1987745815, Iran f School of Civil Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran b
*
Corresponding author. E-mail: [email protected]
© Higher Education Press 2020
ABSTRACT Increasing the bending capacity of reinforced concrete (RC) elements is one of important topics in structure engineering. The goal of this study is to develop a transferred stress system (TSS) on longitudinal reinforcement bars for increasing the bending capacity of RC frames. The study is divided into two parts, i.e., experimental tests and nonlinear FE analysis. The experiments were carried out to determine the load-deflection curves and crack patterns of the ordinary and TSS fixed frame. The FE models were developed for simulating the fixed frames. The obtained loaddeflection results and the observed cracks from the FE analysis and experimental tests are compared to evaluate the validation of the FE nonlinear models. Based on the validated FE models, the stress distribution on the ordinary and TSS bars were evaluated. We found the load carrying capacity and ductility of TSS fixed beam are 29.39% and 23.69% higher compared to those of the ordinary fixed beams. The crack expansion occurs on the ordinary fixed beam, although there are several crack openings at mid-span of the TSS fixed beam. The crack distribution was changed in the TSS fixed frame. The TSS fixed beam is proposed to employ in RC frame instead of ordinary RC beam for improving the performance of RC frame. KEYWORDS distribution
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transferred stress system, bending capacity, crack opening, crack propagation, FE nonlinear model, stress
Introduction
Finding ways to increase the bending capacity and ductility of reinforced concrete (RC) beams has been of major interest in structural engineering. Several studies have focused on fiber-reinforced polymers (FRP), epoxy bonding the steel plates, and post and pre-tensioning. Several new materials and systems have been proposed to improve the bending capacity and ductility of RC beams. Some studies have focused on employing additional materials after building the RC beam to improve its performance [1– 7]. Although materials can be added after building the RC beam, methods before building the RC beam are important Article history: Received Dec 2, 2019; Accepted Jan 16, 2020
as they exhibit the possibility for designing frames with higher span [1,8]. Elmessalami et al. [9] evaluated columns and beams c
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