Flexural Ductility of Lightweight-Aggregate Concrete Beams

Bernardo, Luís; Nepomuceno, Miguel; Pinto, Hugo Alexandre Silva

doi:10.3846/13923730.2014.914094

Cited by 18 publications

(42 citation statements)

References 11 publications

(32 reference statements)

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“…Such combination provides ductility for RC LWAC members. This was previously confirmed with experiments on beams under flexure which were built with LWAC (Liu et al in 2006 [5], Bernardo et al in 2016 [6,7]). However, such studies have also shown that some important differences exist between the performance of RC LWAC and RC NWAC beams.…”

Section: Introductionsupporting

confidence: 55%

“…For this reason, studies specially focused on the flexural behavior of RC LWAC beams continue to be reported in the literature, such as the ones from Liu et al in 2006 [5], Jung et al in 2007 [4] and Sin et al in 2010 [8]. A more detailed literature review can be found in [6]. As a consequence, proposals for the extension of design codes to RC LWAC beams have been reported and the work is still ongoing.…”

Section: Introductionmentioning

confidence: 99%

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Neutral Axis Depth versus Ductility and Plastic Rotation Capacity on Bending in Lightweight-Aggregate Concrete Beams

2019

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This article presents an experimental study on the evolution of the neutral axis depth at failure in the critical section with the flexural ductility and plastic rotation capacity of reinforced concrete (RC) lightweight-aggregate concrete (LWAC) beams. For this, the results of a previous experimental program involving RC LWAC beams tested in flexure until failure are used. The variable studies were the concrete compressive strength (between 22.0 and 60.4 MPa and dry density between 1651 and 1953 kg/m3) and the longitudinal tensile reinforcement ratio (between 0.13% and 2.69%). The flexural ductility and the plastic rotation capacity of the RC LWAC beams are characterized by a ductility index and a plastic trend parameter, respectively. The influence of the variable studies, as well as the relation of the flexural ductility and plastic rotation capacity with the values for the neutral axis depth at failure are analyzed and discussed. Some conclusions are drawn which can be useful for the design of RC LWAC beams for flexure. In particular, it is shown that the practical rule of limiting the neutral axis depth at failure to ensure ductile behavior, as used in normal-weight aggregate concrete beams, is also valid for RC LWAC beams.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Neutral Axis Depth versus Ductility and Plastic Rotation Capacity on Bending in Lightweight-Aggregate Concrete Beams

2019

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“…The database consists of data from 51 lightweight aggregate concrete flexural elements obtained from five different test programs reported by Carmo et al [15], Sin et al [14], Bernardo et al [38], Wu et al [39], and Vakhshouri [30]. The main characteristics of the flexural elements are given in Tables 1 and 2.…”

Section: Database Of Experimental Results and Accuracy Analysis Of Prmentioning

confidence: 99%

“…It is important to note that EC2 and ACI code methods produced predictions that were too stiff. [14]; (e and f) Bernardo et al [38]; (g) Wu et al [39]; and (h) Vakhshouri [30]. [14]; (e,f) Bernardo et al [38]; (g) Wu et al [39]; and (h) Vakhshouri [30].…”

Section: Database Of Experimental Results and Accuracy Analysis Of Prmentioning

confidence: 99%

“…[14]; (e and f) Bernardo et al [38]; (g) Wu et al [39]; and (h) Vakhshouri [30]. [14]; (e,f) Bernardo et al [38]; (g) Wu et al [39]; and (h) Vakhshouri [30]. Figure 5 shows the scatter of the normalized curvature predictions for ranges of material and geometrical parameters such as reinforcement percentage ρ R , concrete density ρ, compressive strength of concrete, f lcm , and shrinkage deformation ε shr .…”

Section: Database Of Experimental Results and Accuracy Analysis Of Prmentioning

confidence: 99%

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Deformation Analysis of Reinforced Beams Made of Lightweight Aggregate Concrete

Bačinskas

Rumsys²,

Соколов

et al. 2019

Materials

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In the present trend of constructing taller and longer structures, the application of lightweight aggregate concrete is becoming an increasingly important advanced solution in the modern construction industry. In engineering practice, the analysis of lightweight concrete elements is performed using the same algorithms that are applied for normal concrete elements. As an alternative to traditional engineering methods, nonlinear numerical algorithms based on constitutive material models may be used. The paper presents a comparative analysis of curvature calculations for flexural lightweight concrete elements, incorporating analytical code methods EN 1992-1 and ACI 318-19, as well as a numerical analysis using the constitutive model of cracked tensile lightweight concrete recently proposed by the authors. To evaluate the adequacy of the theoretical predictions, experimental data of 51 lightweight concrete beams of five different programs reported in the literature were collected. A comparison of theoretical and experimental results showed that the most accurate predictions are obtained using numerical analysis and the constitutive model proposed by the authors. In the future, the latter algorithm can be used as a reliable tool for improving the design standard methods or numerical modeling of lightweight concrete elements subjected to short-term loading.

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Flexural capacity and ductility of lightweight concrete T‐beams

Yang

Hwang

Song

2020

Structural Concrete

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The present study aims to estimate the flexural capacity and ductility of lightweight concrete T‐beams prepared using the expanded bottom ash and dredged soil granules (LWAC‐BS beams). Eight full‐scale beams were prepared under the main parameters including the unit weight and compressive strength of concrete and amount of longitudinal tensile reinforcement. The moment capacities and displacement ductility ratios measured for the present specimens were compared with those compiled from normal‐weight concrete (NWC) beams and lightweight concrete beams made using the expanded clay and fly ash granules (LWAC‐CF beams) with respect to the longitudinal reinforcement index (ωs). The coefficients for the equivalent rectangular stress block to assess the ultimate moment capacity of LWAC beams were formulated from the actual stress–strain curve of the concrete. The test results showed that the effect of the type of artificially expanded lightweight granules on the normalized cracking and ultimate moment capacities of LWAC beams was insignificant, whereas LWAC‐BS beams exhibited lower displacement ductility ratios than LWAC‐CF beams at the same ωs value. The maximum amount of longitudinal tensile reinforcement specified in ACI 318‐14 provision for preventing brittle failure of the beam needs to be lowered for LWAC beams. When determining the coefficients of the equivalent stress block for LWAC members, the concrete unit weight deserves consideration as a primary factor together with the compressive strength of the concrete.

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Flexural Ductility of Lightweight-Aggregate Concrete Beams

Cited by 18 publications

References 11 publications

Neutral Axis Depth versus Ductility and Plastic Rotation Capacity on Bending in Lightweight-Aggregate Concrete Beams

Neutral Axis Depth versus Ductility and Plastic Rotation Capacity on Bending in Lightweight-Aggregate Concrete Beams

Deformation Analysis of Reinforced Beams Made of Lightweight Aggregate Concrete

Flexural capacity and ductility of lightweight concrete T‐beams

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