RESEARCH ARTICLE
. 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.. Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Vietnam.. Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam.. School of Civil engineering, Islamic Azad University, Tehran 1987745815, Iran.. School of Civil Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran
Received: 2020-08-25
Accepted: 2020-10-20
Available online: 2020-10-20
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 load-deflection 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.
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