Time-dependent behaviour of steel tubular columns filled with recycled coarse aggregate concrete

Geng, Yun; Wang, Yuyin; Chen, Jie

doi:10.1016/j.jcsr.2016.04.009

Cited by 47 publications

(13 citation statements)

References 32 publications

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“…Many researchers have tried to modify the expressions available in the literature for creep prediction to take into account the presence of recycled aggregates [8,9,15,[17][18][19][20][21][22][23]. The parameters adopted by each work for the proposed modifications are summarized in Appendix A Table A3.…”

Section: Creep Prediction Modelsmentioning

confidence: 99%

“…The proposed modification improved the prediction of experimental results obtained by the authors, but it has not been verified with other results. Geng et al [21,23] used the basic definition of creep coefficient (Equation ( 1)) and Neville's model and modified them to account for RCA. The proposed modification takes into account the water absorption and the density of RCA as well as the microstructural modifications related to RCA incorporation in concrete.…”

Section: Creep Prediction Modelsmentioning

confidence: 99%

“…Other studies will be presented and analyzed thereafter, but the common point between all the works is that the authors have tried to model the creep behavior of RAC based on their results by admitting the validity of analytical models for NAC [9,[18][19][20][21][22][23]. In addition, some authors propose modifications with factors that are often difficult to measure [8,9,23].…”

Section: Introductionmentioning

confidence: 99%

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Towards a New Analytical Creep Model for Cement-Based Concrete Using Design Standards Approach

2021

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Creep properties are determined in design standards by measuring the creep coefficient, noted φ, as a function of time, t, and the age of the concrete at loading, t0. The work aims to study the validity of the analytical models proposed in the most used international standards and to check the possibility of their extension to estimate the creep of recycled aggregates concrete (RAC). A database was built from experimental results available in bibliographic references including 121 creep curves divided into 73 curves for natural aggregates concrete (NAC) and 48 curves for RAC. The comparison between the experimental and predicted values showed a significant dispersion for NAC and RAC. For the remediation of this dispersion, a new analytical model was developed for NAC. The parameters being the conventional creep coefficient, φ0, the power of the ageing function, named α, and βh, which accounts for the relative humidity and the compressive strength in the ageing function, were identified by inverse analysis. It was found that the power of the ageing function is 0.44 and not 0.3, as fixed by Eurocode 2 (EC2). Moreover, new expressions were proposed for φ0 and βh. The presence of recycled aggregates was considered through the equivalent replacement ratio.

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Section: Creep Prediction Modelsmentioning

confidence: 99%

Section: Creep Prediction Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Towards a New Analytical Creep Model for Cement-Based Concrete Using Design Standards Approach

2021

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“…A lot of scientists devote their scientific works to this problem. We can see the parts of this theme in the works of F. Bencardino [1]; Green concrete production with ceramic wastes and laterite [2]; Strength and ductility characteristics of reinforcing steel bars milled from scrap metals [3]; Evaluation of the flexural behavior of composite beam with inverted-T steel girder and steel fiber reinforced ultra high performance concrete slab [4]; Predicting the post-cracking behavior of normal-and highstrength steel-fiber-reinforced concrete beams [5]; High-volume natural volcanic pozzolan and limestone powder as partial replacements for portland cement in self-compacting and sustainable concrete [6]; Improving degradation resistance of sisal fiber in concrete through fiber surface treatment [7]; Experimental investigations of size effect in reinforced concrete beams failing by shear [8]; Utilization of coal-and biomass-fired ash in the production of self-consolidating concrete [9]; Theoretical and experimental study on mechanical properties and flexural strength of fly ash-geopolymer concrete [10]; A review of waste products utilized as supplements to Portland cement in concrete [11]; Benefits of using blended waste coarse lightweight aggregates in structural lightweight aggregate concrete [12]; Evaluation of various treatment methods for enhancing the physical and morphological properties of coarse recycled concrete aggregate [13]; Time-dependent behaviour of steel tubular columns filled with recycled coarse aggregate concrete [14]; Investigation of using recycled powder from waste of clay bricks and cement solids in reactive powder concrete [15]; Eco-friendly concretes with reduced water and cement contents -Mix design principles and laboratory tests [16]; Recycling lead-based paint contaminated deconstructed masonry materials as aggregate for Portland cement concrete-…”

Section: Literature Reviewmentioning

confidence: 99%

Ecologically Safe and Techno Economically Efficient Reinforced Concrete Constructions of Equal Resistance

Mailyan

2016

MATEC Web Conf.

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Abstract.Creation of reinforced concrete constructions of ideally equal resistance is practically impossible, however maximum approximation to such solution should become the main purpose of constructions designing, since it provides for minimal materials consumption. Changing of total cross section of pre-stressed reinforcement along the span with the purpose of approximation to elements of equal resistance is possible during creation of stepped section of the element. In particular, the suggested solution allows to closely approximate the ideal beam of equal resistance, at which with decrease of external moment the height of element's cross-section and the area of cross-section of extrastrong pre-stressed reinforcement are also decreased. In accordance with the existing reinforced concrete construction with the same class of concrete, reinforcement steel and load the suggested one due to more advanced profile is the most economic -the consumption of steel, concrete and weight of the beam are lower in it. This increases the ecological safety of constructions, as well.

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“…Test results indicated that the seismic behaviors of the RCFST columns were similar to those of the corresponding ordinary CFST columns, and it was feasible to apply these RCFST columns in seismic areas. Geng et al [21] carried out an experiment on the time-dependent behavior of RCFST columns. Tests results revealed that the total deformation of RCFST columns could increase by up to 50% after five months subjected to sustained loading, which was 22% higher than that of the ordinary CFST columns.…”

Section: Introductionmentioning

confidence: 99%

Stiffness Analysis of Recycled Self‐Compacting Concrete‐Filled Circular Steel Tubular Columns under Eccentric Compression

Fang

et al. 2019

Advances in Civil Engineering

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In this study, twenty-one recycled self-compacting concrete-filled circular steel tubular (RSCFCST) columns are designed and tested under eccentric compression. The studied parameters including the replacement ratio of the recycled coarse aggregate (RCA), strength grade of concrete, eccentricity, and length-diameter ratio L/D of specimens are considered. The load-stiffness curves of the specimens are obtained by observing the whole process of loading, and the effects of various parameters on the stiffness of the specimens are analyzed. Test results demonstrate that the RSCFCST short columns L/D≤4 under eccentric compression exhibit drum-like bending failures, while the RSCFCST long columns L/D>4 under eccentric compression experience the global flexural buckling failure modes. With the replacement ratio of RCA, the length-diameter ratio or eccentricity increases, and the bearing capacity of specimens under eccentric compression decreases. However, the increase in the strength grade of concrete increases the bearing capacity. The stiffness of the RSCFCST columns under eccentric compression gradually increases as the strength grade of concrete increases, while the eccentricity had an adverse effect on stiffness of specimen. With the increase of load, the increase of the length-diameter ratio would accelerate the stiffness degradation of specimen. The effect of the replacement ratio of RCA on stiffness of specimen in the elastic stage is not obvious. A validated FE model is employed to conduct parametric studies to widen the available test results. Additionally, an analytical model for predicting the effective stiffness of the RSCFCST columns under eccentric compression is proposed based on the moment magnifier method, and verification of this method is performed using the test data and FE analysis.

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Time-dependent behaviour of steel tubular columns filled with recycled coarse aggregate concrete

Cited by 47 publications

References 32 publications

Towards a New Analytical Creep Model for Cement-Based Concrete Using Design Standards Approach

Towards a New Analytical Creep Model for Cement-Based Concrete Using Design Standards Approach

Ecologically Safe and Techno Economically Efficient Reinforced Concrete Constructions of Equal Resistance

Stiffness Analysis of Recycled Self‐Compacting Concrete‐Filled Circular Steel Tubular Columns under Eccentric Compression

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