A practical method for proper modeling of structural damping in inelastic plane structural systems

Zareian, Farzin; Medina, Ricardo A.

doi:10.1016/j.compstruc.2009.08.001

Cited by 265 publications

(129 citation statements)

References 10 publications

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“…Damping was set to be 5% in the first two modes. Damping properties of all models were considered as of Rayleigh mass and stiffness proportional type based on the recommendations by Zareian and Medina (2010) for collapse assessment of structure. All calculations were performed using the OpenSees (2011) program.…”

Section: Nonlinear Structural Models and Analytical Methodsmentioning

confidence: 99%

Collapse behavior evaluation of asymmetric buildings subjected to bi‐directional ground motion

Manie

Moghadam

Ghafory‐Ashtiany

2015

Structural Design Tall Build

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SUMMARYThis paper discusses the collapse behavior of low-rise plan-asymmetric buildings under bi-directional horizontal ground motions and utilizing strength and stiffness degrading nonlinear models. For this purpose, three-dimensional three-story and six-story reinforced concrete frame buildings with uni-directional mass eccentricities equal to 0% (symmetrical), 10%, 20% and 30% are subjected to nonlinear static (pushover) as well as incremental dynamic analyses using a set of far-field two-component ground motions and their performance are assessed on the basis of the safety margin against collapse and its probability of occurrence.Comparison of the collapse margin ratios as well as the fragility curves demonstrates significant reduction of the collapse-level ground motion intensity with increasing eccentricity in plan. Results also indicate that current seismic design parameters including the response modification (R), overstrength (Ω) and ductility (μ) factors are not appropriate for buildings with high levels of plan eccentricity. Buildings with high values of plan eccentricity do not meet the design target life safety performance level on the basis of the calculated probability of collapse and safety margin against collapse. It appears that re-evaluation of their design parameters is necessary.

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Section: Nonlinear Structural Models and Analytical Methodsmentioning

confidence: 99%

Collapse behavior evaluation of asymmetric buildings subjected to bi‐directional ground motion

Manie

Moghadam

Ghafory‐Ashtiany

2015

Structural Design Tall Build

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“…Other beams and columns were modeled with rigid elements. The rotational springs used the Ibarra-Krawinkler deterioration model [34][35][36]. 3% strain hardening was used in the analysis of hinges.…”

Section: Results Of the Steel Frame Buildingmentioning

confidence: 99%

Using Parallel Computer Systems to Examine Seismic Reliability of Structures

J¹

2015

J Steel Struct Constr

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Structural response under seismic loadings is typically nonlinear and related to many factors, such as structural configurations, material properties, occupancy loads, earthquake hazards and incomplete knowledge of the system. As all these factors have their sources of uncertainties, structural response under seismic loading has its probabilistic nature. Therefore, the random variable for any structural demand follows a multivariate probability distribution over the integration domain defined by the limit states. Examining the probabilistic behaviour of structures under earthquake loadings has to consider the sources of uncertainties from all factors. It is also known that numerical methods, such as the finite element method, are commonly used to predict nonlinear structural response. The probabilistic structural demand is a discrete probability function of its related variables. In order to examine seismic risks and mitigate potential damages to structures, it is important to accurately quantify seismic reliability of structures. The traditional seismic reliability analysis uses approximate algebra equations with parameters obtained from aggregation of data points of dynamic analysis, which may not be able to produce accurate results. In this paper, probabilistic seismic demands are solved with numerical procedures of the traditional SAC method and the Monte Carlo simulation. These methods rely on the results from repeatable nonlinear dynamic analyses, which were traditionally considered to be a bottle-neck due to limited computing resources. The recent progress in parallel computing technology and open-source software has made such scientific computation affordable for the engineering community. Two parallel computer systems were used to analyze seismic reliability of the structures. One system is based on multiple personal computers in typical computer labs. The other system is to use high performance computer clusters. Both systems were applied to analyze a two-storey wood frame building and a three-storey steel moment building, respectively.

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“…Viscous damping contributions associated with stiffness were based on the stiffness of elements used to model the lateral-load resisting frames except for: (1) elements of the leaning column; (2) highly rigid truss elements that link the frame and leaning column; and (3) zero-length elements used to model beam plastic hinges of SMRF and bearings of BI-IMRF. Because the stiffness of the elastic beam elements of SMRF was modified, the stiffness proportional damping coefficients used with these elements were also modified (following Zareian and Medina [16]). …”

Section: Numerical Models and Methodsmentioning

confidence: 99%

Using PBEE to assess and improve performance of different structural systems for low-rise steel buildings

Terzić¹,

Mahin²

2017

Int. J. SAFE

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In recent earthquakes in Chile, New Zealand, and Japan modern buildings were generally quite safe. However, there was a tremendous variability in the economic and social consequences associated with damage repair and loss of occupancy. Code-compliant structures are generally designed to provide safety and prevent collapse at minimum costs, but when severe ground shaking occurs, the damage to contents, nonstructural components and the structural system can result in loss of function, which can have a dramatic impact on the occupants, owners, and community. Such situations can be avoided by mitigating future seismic damage through a better structural design. Although structural enhancements may likely increase the initial cost of a structure they should be compensated through benefits realized over its lifetime. This paper presents the results of repair cost and repair time analyses of conventional and high-performance code-compliant low-rise commercial steel buildings designed for the same location. The buildings are located at a site with high seismic hazard representative of western North America. The conventional lateral load-resisting systems include: special moment resisting frame, special concentrically braced frame, and buckling restrained braced frame; and high-performance systems include: seismically isolated intermediate moment resisting frame, seismically isolated ordinary concentrically braced frame, seismically isolated buckling restrained braced frame, and viscously damped moment frame. In addition, enhancements of the fixed, seismically isolated, and viscously damped moment frames beyond the code minimum and their effect on the repair cost and repair time are studied. The analysis reveals significant damage savings for code-compliant seismically isolated systems relative to their conventional counterpart, with seismically isolated ordinary concentrically braced frames yielding the largest savings. It also shows that enhancements of the isolation and viscously damped system beyond code minimum standards results in significant reduction in damage-induced losses, while the enhancement of the SMRF does not yield desirable loss reduction.

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A practical method for proper modeling of structural damping in inelastic plane structural systems

Cited by 265 publications

References 10 publications

Collapse behavior evaluation of asymmetric buildings subjected to bi‐directional ground motion

Collapse behavior evaluation of asymmetric buildings subjected to bi‐directional ground motion

Using Parallel Computer Systems to Examine Seismic Reliability of Structures

Using PBEE to assess and improve performance of different structural systems for low-rise steel buildings

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