Seismic Optimum Design of Steel Structures Using Gradient-Based and Genetic Algorithm Methods

Âkbari, Jafar; Ayubirad, Mohammad Sadegh

doi:10.1007/s40999-016-0088-0

Cited by 13 publications

(3 citation statements)

References 20 publications

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“…The use of frame buildings in seismic areas is due to their good resistance to seismic effects during earthquakes. It was found that if frame buildings are designed in compliance with the principles of earthquake-resistant construction, then the earthquake resistance of such buildings is beyond doubt [Akbari & Ayubirad, 2017 Steel braces are used in this sort of structural structure to give the rigidity and strength needed to disperse seismic energy. Various bracing arrangements have been recommended in various building regulations throughout the world.…”

Section: Introductionmentioning

confidence: 99%

Failure Risk for Frame Buildings by Certification Results: Probability Assessment

Lapin¹,

Aldakhov²,

Erzhanov³

et al. 2021

cea

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In many situations, the level of safety is established by following the guidelines set forth in rules or regulations. Engineers are accountable for giving quantitative estimates for different factors, particularly failure cost, when extra information is available, such as the owner's needs. By order of the Akimat of the city of Almaty, within 2017-2018, for the first time, a full certification of the housing stock of apartment buildings was carried out. 1847 multi-story frame buildings of various stories entered into the database. Based on the certification results, for the first time, quantitative estimates of the values of the probability of failure and reliability were obtained for frame buildings of various types. The recurrence of earthquakes is taken into account by the current "Seismic zoning map of the Republic of Kazakhstan." The results of assessments of the values of reliability and failure are used for practical recommendations on reducing the risk and expected losses in case of possible earthquakes. A total reinforcement of frame buildings with a first flexible floor (59 buildings) is proposed. The method of amplification should be determined by special research.

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Section: Introductionmentioning

confidence: 99%

Failure Risk for Frame Buildings by Certification Results: Probability Assessment

Lapin¹,

Aldakhov²,

Erzhanov³

et al. 2021

cea

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“…Kermani et al [33] considered ductility in seismic design of steel structures and presented a simple approach to design steel structures for a predetermined ductility. Akbari and Sadegh Ayubirad [34] developed a computer program for optimization of low, intermediate and high rise frames. They compared the results of sequential quadratic programming method with the results of genetic algorithm technique.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the seismic performance of structures designed based on uniform ductility pattern

Jafarieh

Yekrangnia

2021

NMCE

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In seismic design procedure, the idea of considering uniform inelastic behavior for all stories displaces materials from unnecessary locations to stories needed for damage reduction and leads to a more economic design. In this paper, a parametric study was done to assess the seismic performance of structures designed based on uniform ductility pattern. For this purpose, three artificial records whose response spectrums were matched to the codified design spectrum, were considered. Using an iterative procedure, the tuned strength patterns were obtained for a number of models with various natural periods, ductility ratios, behavior coefficients and stiffness distributions. It can be seen that the strength of stories corresponding to uniform ductility pattern decreases in all stories in comparison with distribution recommended by Standard-2800 especially for middle stories and the total strength of structures as a weight index decreases. Also, a new equation was developed by regression analysis to determine the coefficient of story strength. Assessment of the performance of the structures with tuned story strength distribution under real ground motions showed less dispersion for ductility pattern in comparison with structures which were designed according to Standard-2800. Also, it was seen that if the amplitude of the earthquake response spectrum is larger than the design spectrum, the dispersion of the ductility values over the stories increases significantly. The situation becomes critical for lower stories when the amplitude of the earthquake response spectrum is larger than the design spectrum at periods higher than the fundamental period of the structure. D D

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“…ey showed that using the proposed method reduces the volume of computations and increases the rate of convergence, thus allowing access to frame designs with nearoptimal weights in only a few iterations. Seismic optimum design of steel structures uses gradient-based and genetic algorithm methods [25].…”

Section: Introductionmentioning

confidence: 99%

A New Empirical Correlation for Estimation of EBF Steel Frame Behavior Factor under Near-Fault Earthquakes Using the Genetic Algorithm

Razavi

Siahpolo

Adeli

2020

Journal of Engineering

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The most important feature of the behavior factor is that it allows the structural designer to be able to evaluate the structural seismic demand, using an elastic analysis, based on force-based principles quickly. In most seismic codes, this coefficient is merely dependent on the type of lateral resistance system and is introduced with a fixed number. However, there is a relationship between the behavior factor, ductility (performance level), structural geometric properties, and type of earthquake (near and far). In this paper, a new and accurate correlation is attempted to predict the behavior factor (q) of EBF steel frames, under near-fault earthquakes, using the genetic algorithm (GA). For this purpose, a databank consisting of 12960 data is created. To establish different geometrical properties of models, 3−, 6−, 9−, 12−, 15, and 20− story steel EBF frames were considered with 3 different types of link beam, 3 different types of column stiffness, and 3 different types of brace slenderness. Using nonlinear time history under 20 near-fault earthquake, all models were analyzed to reach 4 different performance levels. 6769 data were used as GA training data. Moreover, to validate the correlation, 2257 data were used as test data for calculating mean squared error (MSE) and correlation coefficient (R) between the predicted values of (q) and the real values. In addition, the MSE and R were calculated for correlation in the train and test data. Also, the comparison of the response of maximum inelastic displacement of 5 stories EBF from the proposed correlation and the mean inelastic time-history analysis confirms the accuracy of the estimate relationship.

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Seismic Optimum Design of Steel Structures Using Gradient-Based and Genetic Algorithm Methods

Cited by 13 publications

References 20 publications

Failure Risk for Frame Buildings by Certification Results: Probability Assessment

Failure Risk for Frame Buildings by Certification Results: Probability Assessment

Assessment of the seismic performance of structures designed based on uniform ductility pattern

A New Empirical Correlation for Estimation of EBF Steel Frame Behavior Factor under Near-Fault Earthquakes Using the Genetic Algorithm

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