Plastic rotation capacity of high-strength concrete beams

Lopes, Sérgio M.R.; Bernardo, Luís

doi:10.1007/bf02481567

Cited by 29 publications

(28 citation statements)

References 2 publications

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“…) and HSC beams (Pecce and Fabbrocino ; Ko et al . ; Lopes and Bernardo ) by other researchers during static beam tests as well as those predicted by Eurocode 2 (EC2 ) based on UK National Annex. The comparisons of NSC and HSC beams are summarised in Tables and , respectively.…”

Section: Flexural Deformability Analysesmentioning

confidence: 66%

Deformability design of high‐performance concrete beams

2011

Structural Design Tall Build

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SUMMARY The use of high‐performance materials (HPMs) such as high‐strength concrete (HSC) and high‐strength steel (HSS) is becoming more popular in the construction of beams and columns of tall buildings. These HPMs not only increase the stiffness and decrease the strength‐to‐weight ratio, but also provide a more sustainable construction method by minimising the construction materials needed. However, HSC and HSS are more brittle than normal‐strength concrete and steel, respectively. Therefore, it will adversely affect the deformability of concrete beams. To evaluate the pros and cons of adopting HPM in beam design, the author will investigate the flexural strength and deformability of concrete beams made of HPMs. The deformability in this study is expressed in normalised rotation capacity and investigated by a parametric study using nonlinear moment–curvature analysis taking into account the degree of reinforcement, confining pressure, concrete and steel yield strength. From the results, it is evident that the deformability of concrete beams increases as the degree of reinforcement decreases or confining pressure increases. However, the effects of concrete and steel yield strength depend on other factors. For practical design purpose, charts and formulas are produced for designing high‐performance concrete beams to meet with specified flexural strength and deformability requirement. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Flexural Deformability Analysesmentioning

confidence: 66%

Deformability design of high‐performance concrete beams

2011

Structural Design Tall Build

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“…(1) and (6)) by the distance between sections AA and JJ of the test beams (5.35 m - Fig. 1), while / loc is computed multiplying h (Eqs.…”

Section: Crackingmentioning

confidence: 99%

“…1), while / loc is computed multiplying h (Eqs. (1) and (6)) by the assumed length for the failure zone (0.60 m).…”

Section: Crackingmentioning

confidence: 99%

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Plastic analysis and twist capacity of high-strength concrete hollow beams under pure torsion

Bernardo

Lopes

2013

Engineering Structures

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“…Experimental investigations also impose limitations in estimating the plastic rotation capacity. For instance, studies show that experimental results obtained from rotation-deflection behaviour show good agreement with the analysis in elastic regime; but for phase of yielding of reinforcing steel, theoretical results do not agree with the experimental inferences (see, for example, Lopes and Bernardo, 2003).…”

Section: Introductionmentioning

confidence: 99%

Curvature ductility of RC sections based on eurocode: Analytical procedure

et al. 2010

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Correct estimate of curvature ductility of reinforced concrete members has always been an attractive subject of study as it engenders a reliable estimate of capacity of buildings under seismic loads. The majority of the building stock needs structural assessment to certify their safety under revised seismic loads by new codes. Structural assessment of existing buildings, by employing nonlinear analyses tools like pushover, needs an accurate input of moment-curvature relationship for reliable results. In the present study, nonlinear characteristics of constitutive materials are mathematically modelled according to Eurocode, currently in prevalence and analytical predictions of curvature ductility of reinforced concrete sections are presented. Relationships, in explicit form, to estimate the moment-curvature response are proposed, leading to closed form solutions after their verification with those obtained from numerical procedures. The purpose is to estimate curvature ductility under service loads in a simpler closed form manner. The influence of longitudinal tensile and compression steel reinforcement ratios on curvature ductility is also examined and discussed. The spread sheet program used to estimate the moment-curvature relationship, after simplifying the complexities involved in such estimate, predicts in good agreement with the proposed analytical expressions. Avoiding somewhat tedious hand calculations and approximations required in conventional iterative design procedures, the proposed estimate of curvature ductility avoids errors and potentially unsafe design

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Plastic rotation capacity of high-strength concrete beams

Cited by 29 publications

References 2 publications

Deformability design of high‐performance concrete beams

Deformability design of high‐performance concrete beams

Plastic analysis and twist capacity of high-strength concrete hollow beams under pure torsion

Curvature ductility of RC sections based on eurocode: Analytical procedure

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