Enhanced reduced model for elastic earthquake response analysis of a class of mono-symmetric shear building structures with constant eccentricity

Adachi, Fumihiro; Yoshitomi, Shinta; Tsuji, Motomu; Takewaki, Izuru

doi:10.1016/j.soildyn.2011.03.010

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…These effects increase with increasing eccentricity and for systems with close lateral and torsional frequencies. For the idealized class of MST buildings subject to assumptions (a) and (b), reduction methods to one story systems will be found in Wittrick & Horsington 1979, Zarate & Ayala 2004, and Adachi et al 2011 In this last publication, a more general method is given, permitting reduced models with more than one story, e.g. 2 stories, leading to improved results.…”

Section: One Story Simplified Modelsmentioning

confidence: 99%

Earthquake induced torsion in buildings: critical review and state of the art

Anagnostopoulos¹,

Kyrkos²,

Stathopoulos³

2015

Earthquakes and Structures

152

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The problem of earthquake induced torsion in buildings is quite old and although it has received a lot of attention in the past several decades, it is still open. This is evident not only from the variability of the pertinent provisions in various modern codes but also from conflicting results debated in the literature. Most of the conducted research on this problem has been based on very simplified, highly idealized models of eccentric one-story systems, with single or double eccentricity and with load bearing elements of the shear beam type, sized only for earthquake action. Initially, elastic models were used but were gradually replaced by inelastic models, since building response under design level earthquakes is expected to be inelastic. Code provisions till today have been based mostly on results of such models or on results from elastic multistory idealizations. In the past decade, however, more accurate multi story inelastic building response has been studied using the well-known and far more accurate plastic hinge model for flexural members. On the basis of such research some interesting conclusions have been drawn, revising older views about the inelastic response of buildings based on one-story simplified model results. The present paper traces these developments and presents new findings that can explain long lasting controversies in this area and at the same time may raise questions about the adequacy of code provisions based on results from questionable models. To organize this review better it was necessary to group the various publications into a number of subtopics and within each subtopic to separate them into smaller groups according to the basic assumptions and/or limitations used. Capacity assessment of irregular buildings and new technologies to control torsional motion have also been included.

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Section: One Story Simplified Modelsmentioning

confidence: 99%

Earthquake induced torsion in buildings: critical review and state of the art

Anagnostopoulos¹,

Kyrkos²,

Stathopoulos³

2015

Earthquakes and Structures

152

View full text Add to dashboard Cite

show abstract

“…Perspectives of further assessment can extend the mentioned tech- The study of behavior of the structure under seismic loads is strongly related to active and passive control techniques. An enhanced reduced model for elastic earthquake response analysis of a class of mono-symmetric shear building structure with constant eccentricity is analyzed in [26]. The method consists of the construction of a reduced model, with the degrees of freedom at representative floor levels only, and the transformation of earthquake input forces into a set of reduced input forces.…”

Section: Analysis and Resultsmentioning

confidence: 99%

Sliding Mode Control and Geometrization Conjecture in Seismic Response

et al. 2021

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The purpose of this paper is to study the sliding mode control as a Ricci flow process in the context of a three-story building structure subjected to seismic waves. The stability conditions result from two Lyapunov functions, the first associated with slipping in a finite period of time and the second with convergence of trajectories to the desired state. Simulation results show that the Ricci flow control leads to minimization of the displacements of the floors.

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“…The structural analysis carried out in this study is elastic, that is, the used static forces are equivalent to the elastic dynamic forces of fixed-base structures. In this sense, for instance, the effects of eccentricities due to lateral torsions that increase the structure response studied in other works 35,36 are not considered.…”

Section: Introduction 1| Backgroundmentioning

confidence: 99%

Recalibration of low seismic excitations in Brazil through probabilistic and deterministic analyses: Application for shear buildings structures

Zacchei

Lyra

2022

Structural Concrete

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Brazil has a low level of seismicity compared to several other regions in the world; however, some significant earthquakes occurred. In this article, four techniques have been used to define new seismic inputs: probabilistic seismic hazard, elastic spectra, synthetic spectra, and artificial accelerograms. To carry out the probabilistic analysis, new seismogenic zones for southeast Brazil established in 2018 have been implemented. Elastic response spectra follow the Brazilian code, whereas the synthetic response spectra have been defined by using attenuation equations. Finally, the artificial accelerograms have been developed using analytical models. Modified Brazilian elastic response spectra by considering the results of the probabilistic seismic hazard analyses are proposed. Artificial accelerations, consistent to the non‐modified and modified elastic response spectra, show that for non‐modified spectra the structural response increases of ~2.50 times. Data for seismogenic zones and specific analytical equations to obtain the probability of non‐exceedance of the spectral accelerations have been adapted for this study. An application for shear buildings was analyzed.

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Enhanced reduced model for elastic earthquake response analysis of a class of mono-symmetric shear building structures with constant eccentricity

Cited by 5 publications

References 21 publications

Earthquake induced torsion in buildings: critical review and state of the art

Earthquake induced torsion in buildings: critical review and state of the art

Sliding Mode Control and Geometrization Conjecture in Seismic Response

Recalibration of low seismic excitations in Brazil through probabilistic and deterministic analyses: Application for shear buildings structures

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