Determination of rectangular stress block parameters for high performance concrete

Öztekin, Ertekin; Pul, Selim; Hüsem, Metin

doi:10.1016/s0141-0296(02)00172-4

Cited by 32 publications

(17 citation statements)

References 5 publications

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“…The method to establish rectangular stress-block parameters based on analytical stress-strain curves was developed in previous studies for Portland concrete [30,33,40,43].…”

Section: Analytical Stress-strain Curves For Geopolymer Concretementioning

confidence: 99%

“…The moment capacity of 15 heat cured fly-ash based GPC beams reported in the previous studies [16,17] is calculated with the proposed rectangular stress-block parameters from Eqs. (43), (45) and (46). The results are compared with calculations based on ACI 318-11 standard [28] and the other stress-block parameters of aforementioned studies [31,32] (summarized in Table 2).…”

Section: Flexural Capacity Of Beamsmentioning

confidence: 99%

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Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Tran

Pham

2019

Structures

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Although there has been a numerous quantity of studies investigating the mechanical properties of geopolymer concrete (GPC), parameters for designing GPC structures are still not systematically investigated and carefully justified. ACI rectangular stress-block parameters is able to predict well the strength of conventional concrete structures but their applicability for GPC is questionable. This study aims to establish new sets of rectangular stress-block parameters for GPC with a broad range of the compressive strength up to 66 MPa. The proposed rectangular stress-block parameters in this study are based on two analytical concrete stress-strain models and measured curves from previous studies of GPC materials. The results from this study show that the use of ACI recommendations for concrete structure in designing GPC beams is still acceptable with high accuracy. However, the axial load-carrying capacity of GPC columns computed by ACI parameters deviate significantly from the experimental results while the proposed parameters provide a good correlation with these experimental data. The significant difference is mainly due to the modification of k 3 , which is the ratio of concrete strength in real structures to standard cylinder samples. This study suggests that the assumption of k 3 =0.9 in previous studies for conventional Portland concrete is not suitable for use in deriving the stress-block parameters of GPC. In some cases, this ratio should be reduced to 0.7 depending on the curing condition.

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“…The method to establish rectangular stress-block parameters based on analytical stress-strain curves was developed in previous studies for Portland concrete [30,33,40,43].…”

Section: Analytical Stress-strain Curves For Geopolymer Concretementioning

confidence: 99%

Section: Flexural Capacity Of Beamsmentioning

confidence: 99%

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Tran

Pham

2019

Structures

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“…Nesse tipo de estrutura, os blocos de concreto empregados nos primeiros pavimentos geralmente possuem resistências acima de 12 MPa. De acordo com vários autores, entre eles Oztekin, Pul e Husem [1] e Poon e Lam [2], para atingirem essa resistência, os blocos devem possuir alta compacidade e porosidade superficial reduzida, fato que pode dificultar a aderência com a argamassa de assentamento.…”

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Influência do tipo de argamassa e suas propriedades do estado fresco nas propriedades mecânicas de alvenarias estruturais de blocos de concreto para edifícios altos

2015

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RESUMO O uso da alvenaria estrutural de blocos de concreto na construção de edifícios altos tem aumentado nos últimos anos em função da economia e racionalização que proporciona aos empreendimentos. Nessa busca pela otimização dos processos, o emprego de novos materiais, como as argamassas industrializadas, tem aumentado significativamente. Essas argamassas geralmente possuem aditivos na sua constituição, e apresentam vantagens de utilização, pois reduzem a responsabilidade de dosagem em obra, facilitam a gestão do canteiro e agilizam o processo de mistura e aplicação. Entretanto, em função da presença de aditivos, estudos indicam que essas argamassas, quando usadas para assentamento de blocos para alvenaria estrutural de resistências elevadas, podem não apresentar aderência adequada ao bloco, além de diminuir drasticamente o fator de eficiência e mudar o mecanismo de ruptura da alvenaria, que passa a ser por esmagamento da junta. Diante disso, foi estudado o desempenho de argamassas industrializadas ofertadas no mercado bem como traços de argamassas mistas empregados no Brasil para alvenarias estruturais de blocos de concreto de elevada resistência à compressão (16 Mpa), para construção de edifícios altos em alvenaria estrutural. A análise baseou-se na resistência à compressão, aderência e mecanismo de ruptura de prismas. Com base nas propriedades desejadas para argamassas empregadas em alvenaria estrutural de edifícios altos, o estudo concluiu que as argamassas mais comumente utilizadas no Brasil, não possuem a capacidade de gerar alvenarias com desempenho totalmente satisfatório.

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“…Although HSC offers many advantages over conventional concrete, as the strength of concrete increases some of its characteristics and engineering properties become different from those of normal-strength concrete (NSC) (ACI, 1992;Rashid et al, 2002). These differences in material properties may have important consequences in terms of the structural behavior and design of HSC members (Oztekin et al, 2003). This concrete, with very high compressive strength, can result in less ductile responses of the structural members.…”

Section: Introductionmentioning

confidence: 99%

Herpetofauna of the vicinity of Akşehir and Eber (Konya, Afyon), Turkey

Cihan¹,

Tok²

2014

Turk J Zool

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In continuous concrete beams, ductility allows redistribution of moment between the negative and positive moment zones. Although many in situ reinforced high strength concrete (RHSC) beams are of continuous construction, there has been very little research on such beams with external reinforcement. Due to premature debonding failures and the linear stress-strain characteristics of fiber reinforced polymer (FRP) up to failure, the ductility of plated members and their ability to redistribute moment is less than that of unplated RC beams.The present study examined the responses of RHSC continuous beams, in terms of enhancement of moment and load capacity, moment redistribution, and different types of ductility. Thickness of carbon FRP (CFRP) sheets, strengthening of both the hogging and sagging region, and end anchorage technique were the main parameters investigated.Various monitoring devices were used to monitor the loading history of the beams. Increasing the number of CFRP sheet layers increased ultimate strength, and decreased ductility, moment redistribution, and ultimate strain on CFRP sheets. Additionally, using end anchorage increased ultimate strength and moment redistribution. The moment enhancement ratio of the strengthened beams was significantly higher than the ultimate load enhancement ratio in the same beam. The proposed equation for converting the energy ductility index to the displacement ductility index provided accurate results.

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Determination of rectangular stress block parameters for high performance concrete

Cited by 32 publications

References 5 publications

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Rectangular Stress-block Parameters for Fly-ash and Slag Based Geopolymer Concrete

Influência do tipo de argamassa e suas propriedades do estado fresco nas propriedades mecânicas de alvenarias estruturais de blocos de concreto para edifícios altos

Herpetofauna of the vicinity of Akşehir and Eber (Konya, Afyon), Turkey

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