Target reliability for bridges with consideration of ultimate limit state

Ghasemi, Seyed Hooman; Nowak, Andrzej S.

doi:10.1016/j.engstruct.2017.09.012

Cited by 48 publications

(26 citation statements)

References 16 publications

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“…Разработаны также поисковые схемы и для стальных стержневых конструкций [73,76,77]. При этом особое внимание уделяется мостовым сооружениям [76,77], для которых кроме минимизации стоимости «в деле» на основе вероятностной модели надежности рассматривается и минимизация так называемой стоимости разрушений при наступлении отказа, оценка срока службы конструкции и устанавливается «коэффициент важности сооружения», определяющий по существу его уровень ответственности C вопросами надежности в оптимальном проектировании связан и учет рисков аварийных ситуаций [83,78]. Для различных типов конструкции разработаны схемы поиска оптимальных решений с учетом как материальных [79,80], так и социальных [82] потерь.…”

Section: основная часть обзораunclassified

Review of modern optimization methods for bearing systems of buildings аnd structures

Tamrazyan

Alekseytsev

2020

Vestnik MGSU

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Introduction. A review of modern approaches to the search for design solutions, optimal by various criteria, for load-bearing construction structures is given. The paper discloses problems of finding solutions on discrete sets of variable parameters reflecting modern approaches to design considering the available range of materials and products. It also formulated the goals of the literary review, its relevance to modern socio-economic conditions, and a brief historical digest reflecting the stages of development of search methods. The focus of the review is on new metaheuristic approaches that are used in world practice to optimize the load-bearing systems. Materials and methods. The methods of searching for relevant literature in international scientific databases are described. The selection of sources was based on the international Web of Science databases by publishing house Thomson Reuters, Scopus, EI Compendex by Elsevier publishing house which, had well-developed tools for thematic search as well as guaranteeing the legitimacy and quality of the literature. Results. The article classified the modern methods of searching for optimal design solutions by several criteria. Those included the metaheuristic approach type, number of optimization goals, methods of considering constraints, presentation of varying parameters, consideration of life cycle stages, survivability, reliability, facility safety levels, and accident risks. A series of the most promising optimization methods based on the mathematical formalization of physical processes, as well as combined iterative strategies, are described. Attention is also paid to some gradient approaches and methods of mathematical programming. Conclusions. The paper has shown that to meet modern requirements for building load-bearing structures, including safety criteria, minimizing costs during the life cycle, reliability, survivability, and other properties, the methods similar to biological processes in wildlife are most widely spread. These methods have a relatively fast adaptability to solve a broad class of problems in construction. Analysis of the reviewed sources showed that the far-reaching methods for solving problems of construction design optimization are stochastic methods using discrete sets of design parameters that reflect features of building structure design.

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Section: основная часть обзораunclassified

Review of modern optimization methods for bearing systems of buildings аnd structures

Tamrazyan

Alekseytsev

2020

Vestnik MGSU

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“…Comparisons with current satisfactory design practice [72]; b. Human safety criteria [7,59]; c. Economic optimization focused on life-cycle costs of representative structures -for instance buildings [4,5], bridges [73,74], or tunnels [75] or a series of structures under systematic replacements over a long period [76,81]. EN 1990 [1] recommends the target reliability index β for the two reference periods -1 and 50 years; see example for medium consequences of failure in Table 1.…”

Section: Target Reliabilitymentioning

confidence: 99%

Calibrating Partial Factors – Methodology, Input Data and Case Study of Steel Structures

Nadolski

Rózsás

Sýkora

2019

Period. Polytech. Civil Eng.

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Partial factors are commonly based on expert judgements and on calibration to previous design formats. This inevitably results in unbalanced structural reliability for different types of construction materials, loads and limit states. Probabilistic calibration makes it possible to account for plentiful requirements on structural performance, environmental conditions, production and execution quality etc. In the light of ongoing revisions of Eurocodes and the development of National Annexes, the study overviews the methodology of probabilistic calibration, provides input data for models of basic variables and illustrates the application by a case study. It appears that the partial factors recommended in the current standards provide for a lower reliability level than that indicated in EN 1990. Different values should be considered for the partial factors for imposed, wind and snow loads, appreciating the distinct nature of uncertainties in their load effects.

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“…The representative results of this numerical study is depicted in Figs. 24,25,26,27,28,29,30,31,32,33, 34, and 35. Fig.…”

Section: Appendixmentioning

confidence: 99%

“…It is worth to be noted that the safety measures of buildings in terms of structural reliability and probabilistic point of view were studied in different researches. However, this perspective of analysis was not considered in the current study [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Structural damage detection of reinforced concrete shear walls subject to consequent earthquakes

2019

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Structural health monitoring is a procedure to provide accurate and immediate information on the condition and efficiency of structures. There is a variety of damage factors and the unpredictability of future damage, is essential for the application of structural health monitoring. Structural health monitoring and damage detection in early stages is one of the most fascinating topics that had been paid attention because the majority of damages can be repaired and reformed by initial evaluation, consequently the spread of damage to the structures, building collapse and rising of costs can be prevented. Detection of concrete shear wall damages are designed to withstand the lateral load on the structure is critical. Since failures and malfunctions of shear walls can lead to serious damage or even progressive dilapidation of concrete structures, any change in stiffness and frequency can clearly demonstrate the occurrence of the damage. In this article, with non-linear time history analysis, the finite element model of structures with concrete shear walls subject to four earthquakes have been extracted and applying Fourier and wavelet transform, the damage of shear walls is detected. The results of displacement, base shear and hysteresis curves for experimental and numerical programs indicate a good agreement which guarantee the precision of the damage detection procedure.

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Target reliability for bridges with consideration of ultimate limit state

Cited by 48 publications

References 16 publications

Review of modern optimization methods for bearing systems of buildings аnd structures

Review of modern optimization methods for bearing systems of buildings аnd structures

Calibrating Partial Factors – Methodology, Input Data and Case Study of Steel Structures

Structural damage detection of reinforced concrete shear walls subject to consequent earthquakes

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