Effect of using Waste Rubber as Partial Replacement of Coarse Aggregate on Torsional Strength of Square Reinforced Concrete Beam

This study proposes a artificial neural network with genetic algorithm (GA-ANN) for predicting the torsional strength of reinforced concrete beam. Genetic algorithm is used to the optimal network structure and parameters. A database of the torsional failure of reinforced concrete beams with a rectangular section subjected to pure torsion was obtained from existing literature for analysis. This study compare the predictions of the GA-ANN model with the ACI 318 code used for analyzing the torsional strength of reinforced concrete beam. The results show that the proposed model provides reasonable predictions of the ultimate torsional strength of reinforced concrete beams and offers superior torsion accuracy compared to that of the ACI 318-89 equation.

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Shear behavior analysis and capacity prediction for the steel fiber reinforced concrete beam with recycled fine aggregate and recycled coarse aggregate

Structures ◽

10.1016/j.istruc.2021.12.075 ◽

2022 ◽

Vol 37 ◽

pp. 44-55

Author(s):

Danying Gao ◽

Weiwei Zhu ◽

Dong Fang ◽

Jiyu Tang ◽

Haitang Zhu

Keyword(s):

Reinforced Concrete ◽

Concrete Beam ◽

Coarse Aggregate ◽

Steel Fiber ◽

Reinforced Concrete Beam ◽

Fiber Reinforced Concrete ◽

Fine Aggregate ◽

Steel Fiber Reinforced Concrete ◽

Recycled Fine Aggregate ◽

Capacity Prediction

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Seismic Behaviour of Exterior Reinforced Concrete Beam-Column Joints in High Performance Concrete Using Metakaolin and Partial Replacement with Quarry Dust

ISRN Materials Science ◽

10.1155/2014/361962 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11 ◽

Cited By ~ 1

Author(s):

G. R. Vijay Shankar ◽

D. Suji

Keyword(s):

Reinforced Concrete ◽

Cyclic Loading ◽

High Performance ◽

Concrete Beam ◽

High Performance Concrete ◽

Concrete Structures ◽

Reinforced Concrete Beam ◽

Partial Replacement ◽

Displacement Curve ◽

Reinforced Concrete Structures

Recent earthquakes have demonstrated that most of the reinforced concrete structures were severely damaged; the beam-column joints, being the lateral and vertical load resisting members in reinforced concrete structures, are particularly vulnerable to failures during earthquakes. The existing reinforced concrete beam-column joints are not designed as per code IS13920:1993. Investigation of high performance concrete (HPC) joints with conventional concrete (CC) joints (exterior beam-column) was performed by comparing various reinforcement detailing schemes. Ten specimens were considered in this investigation and the results were compared: four specimens with CC (with and without seismic detailing), four specimens with HPC (with and without seismic detailing), and two specimens with HPC at confinement joint. The test was conducted for lateral load displacement, hysteresis loop, load ratio, percent of initial stiffness versus displacement curve, total energy dissipation, strain in beam main bars, and crack pattern. The results reveal that HPC with seismic detailing will be better compared with other reinforcements details under cyclic loading and reverse cyclic loading.

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Cyclic behavior of concrete-filled steel tubular column–reinforced concrete beam frames incorporating 100% recycled concrete aggregates

Advances in Structural Engineering ◽

10.1177/1369433218755521 ◽

2018 ◽

Vol 21 (12) ◽

pp. 1802-1814 ◽

Cited By ~ 3

Author(s):

Jun-Tao Li ◽

Zong-Ping Chen ◽

Jin-Jun Xu ◽

Cheng-Gui Jing ◽

Jian-Yang Xue

Keyword(s):

Reinforced Concrete ◽

Concrete Beam ◽

Coarse Aggregate ◽

Reinforced Concrete Beam ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Aggregate Concrete ◽

Coarse Aggregates ◽

Aggregate Content ◽

Beam Frame

Concrete-filled steel tubular structural members can be recognized as an effective mean to improve the mechanical behavior in terms of strength, stiffness, ductility, and energy dissipation for the initial recycle aggregate concrete deficiencies compared with natural aggregate concrete. A small-scale model of square concrete-filled steel tubular column–reinforced concrete beam frame realized employing 100% recycled coarse aggregates was tested under combined axial loads and cyclic reversed lateral flexure. The failure modes, plastic hinges sequence, hysteresis loop, skeleton curve, stiffness degeneration, energy dissipation capacity, and ductility of the frame were presented and analyzed in detail. The structural behavior of square concrete-filled steel tubular column–reinforced concrete beam frame with 100% recycled coarse aggregates was compared with circular concrete-filled steel tubular column–reinforced concrete beam frame made with 100% recycled coarse aggregates. A fiber-based program model for the nonlinear analysis of concrete-filled steel tubular column–reinforced concrete beam frames incorporating recycled coarse aggregates was developed using SeismoStruct, to highlight the effect of recycled coarse aggregate content on mechanical behavior of recycled aggregate concrete and the confinement effect provided by outer tubes on core concrete. The analysis results show that the numerical model can well simulate and predict the seismic behavior of concrete-filled steel tubular column–reinforced concrete beam frames with 100% recycled coarse aggregate content. Both experimental and numerical results demonstrate that concrete-filled steel tubular column–reinforced concrete beam frames with large content of recycled coarse aggregates have a receivable seismic performance, and it is feasible to apply and popularize recycled aggregate concrete into concrete-filled steel tubular structures in seismic regions.

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Structural Behaviour Fly ash and Ferrochrome ash Based Geopolymer Concrete with Recycled Aggregate

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d9513.118419 ◽

2019 ◽

Vol 8 (4) ◽

pp. 9329-9335

Keyword(s):

Reinforced Concrete ◽

Fly Ash ◽

Carbon Footprint ◽

Concrete Beam ◽

Coarse Aggregate ◽

Reinforced Concrete Beam ◽

Recycled Aggregate ◽

Recycled Aggregates ◽

Geopolymer Concrete ◽

Structural Behaviour

Recycled aggregates are the construction demolition wastes which can be used in concrete industry to reduce the carbon footprint of the environment. This paper deals with the structural behaviour of reinforced concrete beam made with different percentages of recycled aggregate as coarse aggregate on a novel geopolymer concrete consist of fly ash and ferrochrome ash as binder. Structural behaviour of RCC beam with 10% and 20% recycled aggregate in geopolymer concrete are studied and compared to the 100% natural coarse aggregate. Experimental results revealed that the up to 10% replacement of recycled aggregate can achieve strength equal to control concrete and it can be the recommended percentage of RCA for concrete industry.

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Stiffness Revising to Recycled Course Aggregate Reinforced Concrete Beams under Short-Term Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.168-170.1443 ◽

2010 ◽

Vol 168-170 ◽

pp. 1443-1448

Author(s):

Wen Hui Bai

Keyword(s):

Experimental Data ◽

Reinforced Concrete ◽

Concrete Beam ◽

Coarse Aggregate ◽

Reinforced Concrete Beam ◽

Engineering Practice ◽

Short Term ◽

Replacement Ratio ◽

Percentage Reinforcement ◽

Recycled Coarse Aggregate

This paper mainly studies the deflection under short-term loading of recycled course aggregate reinforced concrete beam is calculated by using of the formula of short-dated rigidity in code for design of concrete structures. According to testing the flexural performance of 6 recycled course aggregate beams with the same section size, different replacement ratio of recycled coarse aggregate of 0%, 50%, 70%, 100% respectively and different percentage reinforcement of 0.68%, 0.89%, 1.13% respectively, analyzes relation between deflection and replacement ratio of recycled coarse aggregate, deflection and percentage reinforcement, compare measured value and calculated value using of current codes and make statistical analysis this data . By regressing and analyzing the experimental data from literature, supplied short-dated rigidity modified formula of recycled course aggregate beam. The calculation results are in good agreement with the experimental data. The formula of short-dated rigidity can accurately calculate deflection under short-term loading of recycled course aggregate reinforced concrete beam, and can be referenced in engineering practice and correlative regulations.

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