Probability-based criteria for structural design

Ellingwood, Bruce R.; Galambos, Theodore V.

doi:10.1016/0167-4730(82)90012-1

Cited by 170 publications

(66 citation statements)

References 9 publications

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“…Results from widely known international works [17,18] indicate that normal distribution is the one that best fits the description of concrete behavior, which was proven after successive fits using Easyfit software. It should be mentioned that in the existence of an efficient control, the strength values are grouped close to the mean and the distribution curve is high and narrow; on the opposite scenario, the strength values spread out and the curve becomes low and wide.…”

Section: W C Santiago | a T Beckmentioning

confidence: 99%

A new study of Brazilian concrete strength conformance

Santiago

Beck²

2017

Rev. IBRACON Estrut. Mater.

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A new study of Brazilian concrete strength conformance Um novo estudo da conformidade da resistência do concreto produzido no Brasil Abstract ResumoThis paper presents a new evaluation of the strength compliance of concretes produced in Brazil. It is based on experimental results of over twenty-seven thousand concrete samples from different parts of the country. Results show that a significant part of Brazilian concrete do not reach the characteristic strength (fck) specified in design, and the percentage of nonconforming samples tend to be higher than 5%. This study also reveals the concrete produced in the South and Midwest regions have less variability than the ones produced in the other regions of the country. These results emphasize the importance of a rigorous control in manufacturing and reception of concretes in order to reduce the nonconforming cases.Keywords: concrete strength compliance, concrete structures, structural safety.Este artigo apresenta uma nova avaliação da conformidade dos concretos atualmente produzidos no Brasil. Ela está pautada em resultados de ensaios de resistência à compressão axial de mais de vinte e sete mil corpos de prova de concretos moldados in loco, no ato de seu recebimento, em diferentes obras do país. Os resultados mostram que parte do concreto produzido no Brasil não alcança a resistência característica (fck) prevista em projeto, e que o percentual de amostras não conformes tende a ser superior a 5%. Este estudo também evidencia que os concretos produzidos nas regiões Sul e Centro-Oeste apresentam menor variabilidade que aqueles produzidos nas demais regiões do país. Estes resultados reforçam a importância de um controle rigoroso na fabricação e no recebimento do concreto visando diminuir a ocorrência de não conformidades.Palavras-chave: conformidade da resistência do concreto, estruturas de concreto, segurança das estruturas.

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Section: W C Santiago | a T Beckmentioning

confidence: 99%

A new study of Brazilian concrete strength conformance

Santiago

Beck²

2017

Rev. IBRACON Estrut. Mater.

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“…The number of points fallen within the domain, divided by the total number of points generated gives an estimate of the probability of failure in accordance with eqn. (1). The unbiased estimator of the probability of failure is given by 1 N Pf =N i~ ~i (4) in which ~i--0, if M(x) > 0, ~i--1, if M(x) < 0, and N is the total number of cycles.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…Probabilistic assessment of structural safety is receiving increased attention and acceptance with the emergence of probability-based design formats such as the load and resistance factor design (LRFD) approach [ 1,2 ]. The review of reliability analysis techniques presented here, with a detailed example of wind effects on structures, is intended to stimulate more interest and to initiate further applications of reliability concepts in this field.…”

Section: Introductionmentioning

confidence: 99%

Reliability analysis of wind-sensitive structures

Kareem

1990

Journal of Wind Engineering and Industrial Aerodynamics

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SummaryThe theoretical background of practical structural reliability methods encompassing numerical integration, approximate methods and simulation techniques is reviewed in the context of windexcited structures. Their relative merits, shortcomings and limitations are addressed from the standpoint of their accuracy and computational efficiency. Quantitative reliability estimates of a concrete chimney are made, using different analysis procedures. Multiple potential failure modes are represented by the exceeding of the ultimate moment capacity at any level of the chimney height. The general bounds on the system failure probability are expressed in terms of the failure probability of the individual modes. The narrower bounds are established based on the existing theory by taking into account not only the failure probability of the individual modes, but also the joint failure probabilities in any two modes. Based on the findings of this study, it is suggested that the advanced first-order second-moment approximation and the simulation methods, which combine the Monte Carlo technique with variance reduction techniques, may provide accurate results for practical reliability analysis of wind-excited structures.

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“…C LS depends mainly on the probability of failure of the structure based on the limit states functions of the story drifts. X 5 μ CSS friction coefficients 0.11 0.1 Lognormal [55] X 6 DL Dead load 1.05 × DL n * = 3675 kg/m 0.1 Normal [56] X 7 LL Live load 1 × LL n * = 1,500 kg/m 0.25 Extreme Value [56] X 8 E C Modulus of elasticity of concrete 1.12 × E C = 28 GPa 0.13 Lognormal [54] X 9 -Input ground motion --Randomly generated in agreement with Section 3 *DL n and LL n denote the nominal dead and live loads.…”

Section: Reliability-based Design Optimization Problemmentioning

confidence: 99%

Novel procedure for reliability-based cost optimization of seismically isolated structures for the protection of critical equipment: A case study using single curved surface sliders

Moeindarbari

Taghikhany

2017

Struct Control Health Monit

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SummaryThe optimized reliability-based design of seismic isolated structures requires a consideration of the failure probability of the system, in addition to the optimization objectives. The stochastic nature of a given system (e.g., the probable input ground motion) must therefore be properly included in the analysis model. To address this challenge, a novel procedure is developed and examined on a 3-story isolated concrete building model, to minimize the total construction cost of the system with regards to protecting sensitive equipment located within the structure.In this procedure, the structure performance and reliability were first evaluated using time-consuming Monte Carlo simulations. We then employed artificial neural networks as a response surface to facilitate the prediction of the failure probability for the supposed structure. To simulate seismic excitations, we generated artificial ground motion combining random high-frequency and long-period components.Also, a newly developed sensitivity analysis method was used to identify the critical uncertain parameters of the system. Finally, by using a simulated annealing algorithm, we determined the optimal design variables of the structure and isolation system for a range of desired probabilities of failure.The optimal results indicate that, for different target failure probability ranges, some design variables are more significant than others. KEYWORDS base isolation, critical equipment protection, neural network, reliability based cost optimization, sensitivity analysis, spectral non-stationarity

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Probability-based criteria for structural design

Cited by 170 publications

References 9 publications

A new study of Brazilian concrete strength conformance

A new study of Brazilian concrete strength conformance

Reliability analysis of wind-sensitive structures

Novel procedure for reliability-based cost optimization of seismically isolated structures for the protection of critical equipment: A case study using single curved surface sliders

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