Generic frame model for simulation of earthquake responses of steel moment frames

Nakashima, Masayoshi; Ogawa, Kenji; Inoue, Kazuo

doi:10.1002/eqe.148

Cited by 68 publications

(62 citation statements)

References 7 publications

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“…The method is generally applicable for most regular steel moment‐resisting frames and the discussion on the applicable ranges can be found in Nakashima et al. (). The accuracy of the method may be affected by large modeling error in the unoptimized parameters of frames such as the flexibility in column bases.…”

Section: Discussionmentioning

confidence: 99%

Probabilistic updating of fishbone model for assessing seismic damage to beam–column connections in steel moment‐resisting frames

Kurata

2018

Computer aided Civil Eng

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This article presents a probabilistic method of updating fishbone models for assessing seismic damage on beam–column connections in steel moment‐resisting frames. Fishbone models enable explicitly identifying the rotational stiffness of beams, which is not possible with a shear building model commonly used in Bayesian model updating approaches. Necessary formulations to utilize fishbone models for model updating with measured floor accelerations under small‐amplitude loadings including ambient excitations were first formulated. To accommodate the incompleteness of modal data to update unknown parameters of fishbone models, that is, the stiffness of rotational springs, a hierarchical Bayesian model updating algorithm is implemented. Seismic damage of beam–column connections are estimated by making a comparison of the identified rotational stiffness of springs in the fishbone models before and after earthquakes. The effectiveness of the proposed method is first examined with numerical simulations using a 10‐story building model. Then, the applicability to realistic beam damage, that is, not artificially introduced, is evaluated through a full‐scale steel frame test at the E‐Defense shaking table facility. The article also discusses coefficients of variation of the identified stiffness and influence of modeling error on estimation of realistic damage to check the credibility of the method for real‐life applications.

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Section: Discussionmentioning

confidence: 99%

Probabilistic updating of fishbone model for assessing seismic damage to beam–column connections in steel moment‐resisting frames

Kurata

2018

Computer aided Civil Eng

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“…An energy-consistent approach has been presented for reducing the number of DOFs in steel tall frames by extending the generic and fishbone models presented in [10][11][12]. An energy-consistent approach has been presented for reducing the number of DOFs in steel tall frames by extending the generic and fishbone models presented in [10][11][12].…”

Section: Discussionmentioning

confidence: 99%

“…The trapezoidal rule with a time-step of 0.002 s was employed for time integration. For the equivalent generic models, the bias b eq and the dispersion σ eq are obtained as the exponential of the mean of log R max eq =R max full and the standard deviation of log R max eq =R max full , respectively [10,11]. The same program SNAP was used in nonlinear time history analysis.…”

Section: Inputsmentioning

confidence: 99%

Consistent DOF reduction of tall steel frames

Araki

Ohno

Mukai

et al. 2017

Earthq Engng Struct Dyn

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Summary This paper presents an energy‐consistent approach for reducing the number of degrees‐of‐freedom (DOFs) in tall steel frames. In the present approach, the moment resistance of beams and columns in each story is represented by the moment resistance of a rotational spring and a beam‐column element, respectively. The shear resistance provided by braces in each story is represented by the shear resistance of a shear spring. Furthermore, the resistance to the overturning moment provided by axial resistance of columns in each story is represented by the moment resistance of a rotational spring. These representations are carried out by achieving the equivalence between the strain energy stored and dissipated in the elements in the full (unreduced) DOF models and the strain energy stored and dissipated in the corresponding elements in the reduced DOF models. The accuracy of the present approach is demonstrated through numerical examples, which compare the results of nonlinear time history analyses obtained using the full and reduced DOF models. In the numerical examples, the response is estimated for 20‐story and 40‐story steel frames with and without buckling‐restraint braces subjected to a suite of near‐fault and far‐fault ground motions. The present approach is useful in estimating the response of tall steel frames having non‐regular member arrangements to a suite of intense ground motions including near‐fault ones, where it is crucial to capture the influence of higher mode effects on collapse mechanisms. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Accordingly, the number of degrees of freedom can be reduced significantly while keeping almost the same accuracy as NDA of a full-frame model [10]. The details of the condensation are explained in Reference [9].…”

Section: Building Modelsmentioning

confidence: 99%

“…The structural demand is estimated using the safety factors evaluated taking the variability in the seismic hazard, accuracy of the techniques for estimating structural response, and the structural performance level into account. The accuracy of the technique is investigated relative to the structural demand estimated more directly from the probability distributions of the seismic hazard using 'fishbone,' or generic frame [9], models of SMRF buildings.…”

Section: Introductionmentioning

confidence: 99%

Seismic structural demands taking accuracy of response estimation into account

Mori

Maruyama

2007

Earthq Engng Struct Dyn

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Predictors of seismic structural demands (such as inter-storey drift angles) that are less time consuming than nonlinear dynamic analysis (NDA) have proven useful for structural performance assessment and for design. Several techniques have been proposed using the results of a nonlinear static pushover analysis. These techniques often use the maximum response computed via NDA of the inelastic oscillator that is 'equivalent' to the original frame. In practice, it is desirable to estimate the response approximately via a simpler method such as an equivalent linearization technique and uniform hazard spectra at the site. In reliability-based seismic performance assessment and design of a structure, it is necessary to consider the level of accuracy of the techniques used in the assessment. A simple technique is proposed in this paper to estimate the r -year return period value of the inter-storey drift angle of a moment-resisting steel frame using a single uniform hazard spectrum of the r -year return period displacement of an elastic oscillator. The structural demand is estimated using the safety factors evaluated taking the variability in the seismic hazard, accuracy of the techniques for estimating structural response, and the structural performance level into account. The accuracy of the technique is investigated relative to the structural demand estimated more directly from the probability distributions of the seismic hazard. Y. MORI AND Y. MARUYAMA JP4 buildingJP4 is a four-bay and four-storey SMRF building designed by a structural engineer according to Japanese practices [11]. Unlike SAC9 described below, all of the perimeter and interior frames, and all of the beam-column connections of JP4 are moment resisting. Only one of these frames is modelled, taking into account its tributary gravity loads. JP9 buildingJP9 is a nine-storey SMRF building designed directly as a fishbone model as follows.• The height of each storey is 4.0 m, and the mass is distributed equally among the floors.• The storey-shear force for the ith storey, Q i , is given by

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Generic frame model for simulation of earthquake responses of steel moment frames

Cited by 68 publications

References 7 publications

Probabilistic updating of fishbone model for assessing seismic damage to beam–column connections in steel moment‐resisting frames

Probabilistic updating of fishbone model for assessing seismic damage to beam–column connections in steel moment‐resisting frames

Consistent DOF reduction of tall steel frames

Seismic structural demands taking accuracy of response estimation into account

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