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

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.

scholarly journals Nonlinear creep in a steel-reinforced concrete beam

2020 ◽  
Vol 17 (5) ◽  
pp. 108-116
Author(s):  
S. O. Chepilko ◽  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Nonlinear Creep ◽  
Short Term ◽  
Nonlinear Integral Equations ◽  
Steel Reinforced Concrete ◽  
Linear Creep ◽  
Resolving System

Problems of taking into account nonlinear creep in steel- reinforced concrete beams are considered basing on the integral equation of viscous-elastic-plasticity of concrete. There has been obtained the resolving system of nonlinear integral equations, a linearization of this system has been carried out, its asymptotic solutions have been written out for the theory of elastic heredity case. The analysis of taking into account nonlinear creep has been performed compared with the linear creep equations and an instantaneous (short-term) loading allowing for concrete’s nonlinear diagram.

Experiment on the Crack and Deflection of Basalt Fiber Reinforced Concrete Beams

2011 ◽  
Vol 243-249 ◽  
pp. 1058-1061
Author(s):  
Jun Wang ◽  
Huan Jun Ye ◽  
Zhi Wei Sun ◽  
Wei Chen
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Basalt Fiber ◽  
Volume Ratio ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Engineering Practice ◽  
Fiber Reinforced

In order to research the influence of basalt fiber on the crack and deflection of the reinforced concrete beams, four basalt fiber reinforced concrete beams with the key parameters of length which were 12mm and 30mm and volume ratio which were 0.1% and 0.2% were designed and made. The test data was obtained through the bending experiment and the comparison with the common reinforced concrete beam. The result shows that it is obvious to control the crack and deflection of the test beams with the increasing of basalt fiber characteristic parameters. The calculation method of the maximum crack width of the basalt fiber reinforced concrete beams were presented based on the method of common concrete beam, which can provide the theoretical basis for the engineering practice.

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

2018 ◽  
Vol 21 (12) ◽  
pp. 1802-1814 ◽  
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.

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

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.

Study of Stiffness Calculation Method on Reinforced Concrete Beam Strengthened with CFRP

2013 ◽  
Vol 744 ◽  
pp. 455-458
Author(s):  
Xue Han ◽  
Zheng Liu ◽  
Xin Xu ◽  
Chao Ge
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Beam Deflection ◽  
Sustained Load ◽  
Deformation Capacity ◽  
Calculation Methods ◽  
Short Term ◽  
Direct Reinforcement

The beam member should not only meet the requirement of carrying capacity but also has the ability to resist deformation. The calculation of beam deflection mainly boils down to the stiffness calculation in the existing calculation theory of deformation capacity. The flexural stiffness of concrete beams after strengthened with CFRP has been improved greatly. Direct reinforcement and sustained load reinforcement short-term stiffness calculation methods of CFRP reinforced concrete in normal service stage are derived in this article, which could be used for strengthening design.

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