Enhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced Concrete
Abstract The knee beam–column joint is a critical location in a Reinforced Concrete (RC) structure particularly when subjected to earthquake vibrations. The current structural design codes dictate the use of high amounts of steel reinforcements in the frame joint to manage large strain demands in se...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
SpringerOpen
2021-04-01
|
Series: | International Journal of Concrete Structures and Materials |
Subjects: | |
Online Access: | https://doi.org/10.1186/s40069-021-00457-w |
id |
doaj-4ea2c1d4331b43b5bef5af04b2c5dc11 |
---|---|
record_format |
Article |
spelling |
doaj-4ea2c1d4331b43b5bef5af04b2c5dc112021-04-04T11:25:01ZengSpringerOpenInternational Journal of Concrete Structures and Materials1976-04852234-13152021-04-0115112810.1186/s40069-021-00457-wEnhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced ConcreteS. M. Iqbal S. Zainal0Farzad Hejazi1Raizal S. M. Rashid2Department of Civil Engineering, Universiti Putra MalaysiaDepartment of Civil Engineering, Universiti Putra MalaysiaDepartment of Civil Engineering, Universiti Putra MalaysiaAbstract The knee beam–column joint is a critical location in a Reinforced Concrete (RC) structure particularly when subjected to earthquake vibrations. The current structural design codes dictate the use of high amounts of steel reinforcements in the frame joint to manage large strain demands in seismic-prone regions. However, these codes could result in the congestion of steel reinforcements in the limited joint area which can consequently produce numerous construction complications. This study aims to improve the structural performance of Knee Joint (KJ) by reducing the load induced to the embedded steel reinforcements during seismic vibrations. Hence, this study attempted to develop a Hybrid Fiber Reinforced Concrete (HyFRC) by combining multiple synthetic fibers to be introduced onto KJ. Six KJ specimens were cast using five developed HyFRC materials and one Control specimen to be experimentally tested under lateral cyclic loading. The results indicated significant improvements for the HyFRC KJ specimens particularly in energy dissipation capacity, stiffness degradation rate, displacement ductility toughness, steel reinforcement strain and hysteretic behavior. A total of six Finite Element (FE) KJ models were developed using the HyFRC materials to verify the results from the experimental testing. The accuracy of the proposed FE models resulted in average percentage differences of 25.89% for peak load, 3.45% for peak load displacement and 0.18% for maximum displacements from the experimental data. In conclusion, this study developed HyFRC materials that are beneficial in providing cost-efficient alternatives to Reinforced Concrete (RC) KJ structures in areas with low to moderate level of seismic risks.https://doi.org/10.1186/s40069-021-00457-wFORTA FibersSynthetic FibersHybrid Fiber Reinforced ConcreteFiber Reinforced ConcreteKnee JointBeam–Column |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
S. M. Iqbal S. Zainal Farzad Hejazi Raizal S. M. Rashid |
spellingShingle |
S. M. Iqbal S. Zainal Farzad Hejazi Raizal S. M. Rashid Enhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced Concrete International Journal of Concrete Structures and Materials FORTA Fibers Synthetic Fibers Hybrid Fiber Reinforced Concrete Fiber Reinforced Concrete Knee Joint Beam–Column |
author_facet |
S. M. Iqbal S. Zainal Farzad Hejazi Raizal S. M. Rashid |
author_sort |
S. M. Iqbal S. Zainal |
title |
Enhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced Concrete |
title_short |
Enhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced Concrete |
title_full |
Enhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced Concrete |
title_fullStr |
Enhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced Concrete |
title_full_unstemmed |
Enhancing the Performance of Knee Beam–Column Joint Using Hybrid Fibers Reinforced Concrete |
title_sort |
enhancing the performance of knee beam–column joint using hybrid fibers reinforced concrete |
publisher |
SpringerOpen |
series |
International Journal of Concrete Structures and Materials |
issn |
1976-0485 2234-1315 |
publishDate |
2021-04-01 |
description |
Abstract The knee beam–column joint is a critical location in a Reinforced Concrete (RC) structure particularly when subjected to earthquake vibrations. The current structural design codes dictate the use of high amounts of steel reinforcements in the frame joint to manage large strain demands in seismic-prone regions. However, these codes could result in the congestion of steel reinforcements in the limited joint area which can consequently produce numerous construction complications. This study aims to improve the structural performance of Knee Joint (KJ) by reducing the load induced to the embedded steel reinforcements during seismic vibrations. Hence, this study attempted to develop a Hybrid Fiber Reinforced Concrete (HyFRC) by combining multiple synthetic fibers to be introduced onto KJ. Six KJ specimens were cast using five developed HyFRC materials and one Control specimen to be experimentally tested under lateral cyclic loading. The results indicated significant improvements for the HyFRC KJ specimens particularly in energy dissipation capacity, stiffness degradation rate, displacement ductility toughness, steel reinforcement strain and hysteretic behavior. A total of six Finite Element (FE) KJ models were developed using the HyFRC materials to verify the results from the experimental testing. The accuracy of the proposed FE models resulted in average percentage differences of 25.89% for peak load, 3.45% for peak load displacement and 0.18% for maximum displacements from the experimental data. In conclusion, this study developed HyFRC materials that are beneficial in providing cost-efficient alternatives to Reinforced Concrete (RC) KJ structures in areas with low to moderate level of seismic risks. |
topic |
FORTA Fibers Synthetic Fibers Hybrid Fiber Reinforced Concrete Fiber Reinforced Concrete Knee Joint Beam–Column |
url |
https://doi.org/10.1186/s40069-021-00457-w |
work_keys_str_mv |
AT smiqbalszainal enhancingtheperformanceofkneebeamcolumnjointusinghybridfibersreinforcedconcrete AT farzadhejazi enhancingtheperformanceofkneebeamcolumnjointusinghybridfibersreinforcedconcrete AT raizalsmrashid enhancingtheperformanceofkneebeamcolumnjointusinghybridfibersreinforcedconcrete |
_version_ |
1721542717704503296 |