Multi-Mode Response of Shear and Flexural Buildings to Pulse-Type Ground Motions in Near-Field Earthquakes

Khaloo, Alireza; Khosravi, Horr

doi:10.1080/13632460701513132

Cited by 17 publications

(10 citation statements)

References 9 publications

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“…A combination of uniform shear and flexural cantilever beams to estimate the elastic structural response of a tall building was also proposed in 2008 by Khaloo and Khosravi [70]. Extending the formulation proposed by Stafford Smith and Miranda, they investigated the multi-mode effects of tall buildings subjected to near-field ground motions, assuming the linearity of the system.…”

Section: Coupled Beamsmentioning

confidence: 99%

A Review of Simplified Numerical Beam-like Models of Multi-Storey Framed Buildings

et al. 2022

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Modern computational techniques have greatly influenced the numerical analyses of structures, not only in terms of calculation speed, but also in terms of procedural approach. In particular, great importance has been given to structural modelling, that is, the process by which a structure and the actions to which it is subjected are reduced to a simplified scheme. The use of a simplified calculation scheme is necessary since the structures are, in general, considerably complex physical systems whose behaviour is influenced by a large number of variables. The definition of a structural scheme that is at the same time simple enough to be easily computable as well as sufficiently reliable in reproducing the main characteristics of the behaviour of the analysed structure is, therefore, a crucial task. In particular, with reference to multi-storey framed buildings, the extensive use of three-dimensional finite element models (FEM) has been made in recent decades by researchers and structural engineers. However, an interesting and alternative research field concerns the possibility of studying multi-storey buildings through the use of equivalent beam-like models in which the number of degrees of freedom and the required computational effort are reduced with respect to more demanding FEM models. Several researchers have proposed single or coupled continuous beams to simulate either the static or dynamic response of multi-storey buildings assuming elastic or inelastic behaviour of the constitutive material. In this paper, a review of several scientific papers proposing elastic or inelastic beam-like models for the structural analyses of framed multi-storey buildings is presented. Considerations about limits and potentialities of these models are also included.

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Section: Coupled Beamsmentioning

confidence: 99%

A Review of Simplified Numerical Beam-like Models of Multi-Storey Framed Buildings

et al. 2022

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“…Dead load and live load are 3.5 and 1 ton/m for each frame and the mass is lumped at each story floor. The models are classic moment resisting frames with elastic beam and due to near-fault ground motions and simple equivalent pulses (Iwan 1997;Heidebrecht and Rutenberg 2000;Huang 2003;Krawinkler et al 2003;Kalkan and Kunnath 2006;Gicev and Trifunac 2009;Gulkan and Akkar 2002;Akkar et al 2005;Miranda and Akkar 2006;Khaloo and Khosravi 2008). The emerging concepts of performance-based design require a quantitative understanding of response to different types of ground motions at different performance levels, ranging from nearly elastic to highly inelastic behavior.…”

Section: Description Of Detailed and Simplified Modelsmentioning

confidence: 99%

Nonlinear Interstory Drift Contours for Idealized Forward Directivity Pulses Using “Modified Fish-Bone” Models

Khaloo

Khosravi

Hamidi³

2015

Advances in Structural Engineering

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Four 5-, 10-, 20- and 30-story moment frames, representing low-, mid-, and two high-rise structures, were subjected to a great number of idealized directivity pulses. The amplitudes and periods of pulses vary from 0.02 g to 1.0 g and 0.5 to 12 sec, respectively. Over 1400 nonlinear dynamic analyses of low- to high-rise moment frames were performed which were feasible through using modified fish-bone model. The distribution of interstory drift along the height was studied and two applied contours were proposed: (i) the maximum interstory drift contour, and (ii) the critical story contour. These contours were demonstrated versus the ratio of natural period of the structure to the pulse period and the response modification coefficient (R-factor). Hence, the contours could provide the possibility of investigating the measure of damage, its location and also the conditions leading to collapse based on these parameters. These investigations justify the vulnerability of flexible buildings versus long-period directivity pulses. They also show that some near-fault directivity pulses could impose serious damage to low-rise buildings.

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“…In recent years, substantial research has been devoted to developing efficient, rapid, and reliable methods for estimating these responses using approximate solutions. Among the approximate methods, continuous beam models have become preferred for dynamic analysis, preliminary design, and assessment of buildings under earthquake effects [1][2][3][4][5][6][7][8][9][10][11][12][13]. Buildings are classified according to specific height ranges in the codes: generally, low-rise up to four or five stories, high-rise after 12 stories, and mid-rise buildings in between.…”

Section: Introductionmentioning

confidence: 99%

“…The drift ratios along the height of a building do not exhibit a uniform distribution, and they attain their maximum values at specific stories according to the structural behavior. Since the maximum inter-story drift ratio is directly associated with structural damage, it is also essential to determine the location within the building this maximum response occurs [7]. Khaloo and Khosravi [7] conducted a comprehensive investigation of the behavior of structures under pulse-type ground motions in near-field earthquakes using a continuous beam model.…”

Section: Introductionmentioning

confidence: 99%

Accurate Estimation of Inter-Story Drift Ratio in Multistory Framed Buildings Using a Novel Continuous Beam Model

2023

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This study presents a novel method for accurately predicting the dynamic behavior of multistory frame buildings under earthquake ground motion. The proposed method allows approximately estimating the inter-story drift ratio, a crucial parameter strongly associated with building damage, its distribution along the building height, and its maximum value location. An equivalent continuous beam model with a rotation at the base, consisting of a combination of a shear beam and a flexural beam, is proposed to achieve this. This model derives closed-form solutions for the building’s dynamic characteristics. The lateral deformations along the height of frame buildings subjected to a given earthquake load, particularly the inter-story drift ratio profiles, and the maximum inter-story drift ratio parameter, are investigated. The proposed continuous model requires two dimensionless parameters: the lateral stiffness ratio (α) and the rotation at the base (θ), representing the drift ratio of the first story. For the expression of the lateral stiffness ratio (α) coefficient, a simple equation is also proposed using the beam-to-column stiffness ratio (ρ, or Blume coefficient) associated with the framed (discrete) system. Various building models are employed to validate the proposed method, demonstrating its applicability to both high-rise and low-rise building configurations. With the results obtained, it is shown that the proposed continuous model can be used not only for high-rise or multistory building models but also for low-rise building models.

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Multi-Mode Response of Shear and Flexural Buildings to Pulse-Type Ground Motions in Near-Field Earthquakes

Cited by 17 publications

References 9 publications

A Review of Simplified Numerical Beam-like Models of Multi-Storey Framed Buildings

A Review of Simplified Numerical Beam-like Models of Multi-Storey Framed Buildings

Nonlinear Interstory Drift Contours for Idealized Forward Directivity Pulses Using “Modified Fish-Bone” Models

Accurate Estimation of Inter-Story Drift Ratio in Multistory Framed Buildings Using a Novel Continuous Beam Model

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