Seismic yield displacements of plane moment resisting and x-braced steel frames

Dimopoulos, Athanasios I.; Bazeos, Nikitas; Beskos, D.E.

doi:10.1016/j.soildyn.2012.05.002

Cited by 18 publications

(13 citation statements)

References 6 publications

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“…For steel frame building the following expression is introduced [6]. Step 7: Determination of the system effective period: the equivalent period at peak displacement response is extracted from the displacement spectra, entering with the design displacement Step 8: Determination of design base shear: when the effective period of the substitute structure is calculated in Step 7, the effective stiffness (Keq) is determined using Equation (7). The effective stiffness of the substitute structure is defined as the secant stiffness to maximum response, as drawn in Figure 1(b).…”

Section: Fundamental Of Ddbd Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Seismic Yield Displacement Profile in Steel Eccentrically Braced Frames

Zahedi

Saffari

2019

IJE

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Displacement-based methods are recognized as appropriate approaches to reach the goals of performance-based seismic design method. In the direct displacement-based seismic design method, the seismic yield displacement is applied as one of the important design parameters. In this paper, a new relation is suggested to determine the lateral displacement pattern at first yielding of eccentrically braced frame systems subjected to earthquake ground motions. This relation considers the influence of various structural features of frames. It is developed from the results of several nonlinear dynamic analyses containing 30 eccentrically braced frames under 15 far-field and near-field earthquake ground motions. Then, the results of these analyses are processed by nonlinear regression analysis in order to establish the most effective parameters on the yield displacement pattern of the frames. As a result, a comparison between the suggested yield displacement pattern and nonlinear dynamic analyses showed the efficiency and advantages of the suggested approach.

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Section: Fundamental Of Ddbd Methodsmentioning

confidence: 99%

“…These equations were obtained according to fundamentals of mechanics science. Furthermore, Dimopoulos et al [7] suggested simple equations for determination lateral displacements at first yielding of moment resisting and concentrically braced steel frames.…”

Section: Introductionmentioning

confidence: 99%

Seismic Yield Displacement Profile in Steel Eccentrically Braced Frames

Zahedi

Saffari

2019

IJE

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“…For the yield displacement, a simple initial estimate would be 0.5-0.6% of the building height (or δ y = 0.16-0.20 m) based on Aschheim [15], where δ y is expressed as a function of geometrical and material properties for different structural configurations. Similar expressions, already proposed in the literature (a relevant review is shortly provided in [36]), could be also used to determine the yield displacement. However, in our case, the pushover curve (Figure 3, left) allows us to directly determine an accurate result of δ y = 0.217 m, not far from the aforementioned simpler approximation.…”

Section: Yfs-based Redesign Of the Case Study Buildingmentioning

confidence: 98%

“…Alternatively, several approaches of varying simplicity can be considered to define the parameters involved in the YFS framework. For the sake of example, the yield displacement can be readily defined using simplified formulae, already proposed in literature that associate δ y with various geometrical characteristics (e.g., typical floor's or total structure's height, column depth and beam span) as well as structural (e.g., longitudinal reinforcement ratio and column overstrength ratio) and material properties (e.g., yield strain of steel reinforcing bars) [15,36,[43][44][45][46]. Experts engineering judgement could be even used for a preliminary estimation of the yield displacement since it has been found to be of higher stability for a given structural configuration than the fundamental period [13,15].…”

Section: Options For Simplified Applicationmentioning

confidence: 99%

Yield frequency spectra and seismic design of code‐compatible RC structures: an illustrative example

Katsanos

Vamvatsikos

2017

Earthq Engng Struct Dyn

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SUMMARYThe seismic design of an 8-story reinforced concrete space frame building is undertaken using a Yield Frequency Spectra (YFS) performance-based approach. YFS offer a visual representation of the entire range of a system's performance in terms of the mean annual frequency (MAF) of exceeding arbitrary global ductility or displacement levels versus the base shear strength. As such, the YFS framework can establish the required base shear and corresponding first-mode period to satisfy arbitrary performance objectives for any structure that may be approximated by a single-degree-of-freedom system with given yield displacement and capacity curve shape. For the 8-story case study building, deformation checking is the governing limit state. A conventional code-based design was performed using seismic intensities tied to the desired MAF for safety checking. Then, the YFS-based approach was employed to redesign the resulting structure working backwards from the desired MAF of response (rather than intensity) to estimate an appropriate value of seismic intensity for use within a typical engineering design process. For this high-seismicity and high-importance midrise building, a stiffer system with higher base shear strength was thus derived. Moreover, performance assessment via incremental dynamic analysis showed that while the code-design did not meet the required performance objective, the YFS-based redesign needed only pushover analysis results to offer a near-optimal design outcome. The rapid convergence of the method in a single design/analysis iteration emphasized its efficiency and practicability as a design aid for practical application.KEY WORDS: performance-based seismic design; seismic code; nonlinear analysis; yield frequency spectra; reinforced concrete; multi-story space frame building.

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“…Hence, nonlinear regression analysis was employed to provide reliable estimates of the maximum roof displacement, the maximum interstory drift ratio, and the behavior factor [12]. Following this, approximate formulae for the estimation of lateral displacements at first yielding of plane steel frames under seismic excitations were provided for use in a performance-based seismic design by Dimopoulos et al [13]. ese formulae were also functions of the geometrical and design properties of the frames and derived on the basis of seismic response of 36 moment-resisting and 36 x-braced plane steel frames, under 84 ordinary seismic ground motions.…”

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 yield displacements of plane moment resisting and x-braced steel frames

Cited by 18 publications

References 6 publications

Seismic Yield Displacement Profile in Steel Eccentrically Braced Frames

Seismic Yield Displacement Profile in Steel Eccentrically Braced Frames

Yield frequency spectra and seismic design of code‐compatible RC structures: an illustrative example

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

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