Analytical investigation of the seismic response of elastic oscillators placed on the top of rocking storey

Bantilas, Kosmas E.; Kavvadias, Ioannis E.; Vasiliadis, Lazaros K.

doi:10.1007/s10518-020-01019-3

Cited by 19 publications

(34 citation statements)

References 56 publications

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“…Moreover, the increase of the stiffness of the rocking base (larger radius of curvature), as well as the increase of the flexibility of the superstructure results in greater stability. Since rocking initiation, the seismic demands of RPSs present a lower bound of Vst [23]. Thus, Figure 8 presents the normalized seismic demands of the podium systems (Vb/Vst)Pod as a function of the maximum tilt angle of the rocking base (| max|/ cr).…”

Section: Seismic Response Under Natural Ground Motionsmentioning

confidence: 99%

“…The dynamic response of rigid blocks rocking on a rigid ground was first studied by Housner [1], who highlighted the parameters that affect the stability of rigid bodies which can be uplifted under horizontal excitations. Since then, with the recognition of the remarkable properties of the rocking response, various forms of rocking systems have been studied, such as flexible rocking oscillators on solid [2][3][4][5][6] and flexible ground [7,8], rocking structures on the foundations [9], rocking bridge piers [10][11][12], rocking frames [13][14][15][16][17], coupled conventional structures with rocking walls [18][19][20] and seismic isolation by forming a rocking floor at the base [21][22][23][24]. Despite the remarkable stability of free-to-rock large-scale systems, the basic requirement for the practical application of rocking systems is the prevention of overturning [25].…”

Section: Introductionmentioning

confidence: 99%

“…Through the analytical model, the forenamed study concentrates mainly on the investigation of parameters related to the stability of such systems, under pulse-type and natural seismic excitations. Based on the sdof model of the superstructure, Bantilas et al [23] investigated the parameters that affect the elastic demands of RPSs. Later studies of Bantilas et al [24] highlighted the critical effect of the higher vibration modes on the dynamic response of RPSs consisted of multiple degree of freedom (mdof) elastic superstructure.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Response of Multi-Storey Structures Seismically Isolated Using Kinematic Bearings

Bantilas¹,

Kavvadias²,

Vasiliadis³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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A storey comprised of free-standing columns that may uplift under ground motion excitations can be regarded as a seismic isolation technique. These columns are referred to the literature as "kinematic bearings" and have been used in Russia and the wider region of the former Soviet Union over the past 40 years. Despite the extensive use of kinematic bearings, there are only limited studies based on the results obtained by the analytical solution of the dynamic response of such structural systems. From this point of view, in the present study the dynamic response of multi-storey structures placed on the top of a kinematic storey is examined. For this purpose an analytical model that describes the dynamic response of such structures is introduced. As long as the curved configuration of the ends of the kinematic bearings can affect the post-uplift stiffness of the kinematic storey, modal analysis is performed and the dynamic properties after the uplift are demonstrated. Subsequently, dynamic time history analyses are performed and the effect of post uplift stiffness of the kinematic storey on the displacement response of the base is investigated. Finally, the seismic demands of the superstructure, as well as their distribution throughout the storeys are examined.

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Section: Seismic Response Under Natural Ground Motionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Response of Multi-Storey Structures Seismically Isolated Using Kinematic Bearings

Bantilas¹,

Kavvadias²,

Vasiliadis³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…The first detailed study of the dynamic response of structures seismically isolated using a purely rocking floor at the base, considering that the superstructure behaves like a single degree of freedom elastic oscillator, was carried out by Bachmann et al [11]. Based on the sdof model of the superstructure, Bantilas et al [12] investigated the parameters that affect the elastic demands of RPSs. Later studies of Bantilas et al [13] highlighted the critical effect of the higher vibration modes on the dynamic response of RPSs consisted of multiple degree of freedom (mdof) elastic superstructure.…”

Section: Rocking Podium Structuresmentioning

confidence: 99%

“…In the present research project, the exploitation of 3D printing in seismic testing was investigated. Especially, the seismic response of rocking podium strictures (RPSs) [11][12][13] was experimentally investigated. RPSs are comprised of an elastic superstructure placed on the top of a rocking story.…”

Section: Introductionmentioning

confidence: 99%

Experimental Identification of Mechanical and Dynamic Characteristics of 3d Printing Specimens

Kavvadias¹,

Tsongas²,

Tzetzis³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Additive manufacturing is at the forefront of research activities worldwide, as the commercial exploitation of this technology is expected to displace some traditional manufacturing methods over the next few years. The aim of this research is the identification of the dynamic characteristics of three-dimensional printing specimens. The specific specimens, composed of 3D printed parts, correspond to elastic single and multiple degree of freedom oscillators. Moreover, parts that represent rigid rocking columns are constructed. Bending tests are performed in order to identify the stiffness of the elastic oscillators. Moreover, experimental results of free vibrations are presented in order to investigate the dynamic response of the rocking parts. The dynamic behavior verification through analytical solutions will highlight the adequacy of 3D printing specimens for conducting experimental research in structural dynamics.

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Seismic fragility and intensity measure investigation for rocking podium structures under synthetic pulse‐like excitations

Bantilas

Kavvadias

Vasiliadis

et al. 2021

Earthq Engng Struct Dyn

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Rocking podium structures (RPSs) refer to a wide class of structural systems in which the base storey consisting of freestanding columns that can uplift during seismic excitations. Due to the rocking response, the base storey can be considered as a base isolation system on the condition that a rocking overturn is prevented. In the present study, the seismic response of RPSs is assessed within a probabilistic framework. For this purpose, synthetic pulse‐like acceleration records are generated. The performance of several ground motion intensity measures in predicting the rocking response of RPSs with different superstructure's fundamental period, lateral displacement profiles and rocking column configuration are examined. The effect of these structural parameters on the rocking response is evaluated in terms of seismic fragility. Finally, the seismic behaviour of the rocking storey, as a seismic isolation technique, is evaluated by examining both the rocking stability and the seismic demand reduction of the superstructure simultaneously.

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Analytical investigation of the seismic response of elastic oscillators placed on the top of rocking storey

Cited by 19 publications

References 56 publications

Dynamic Response of Multi-Storey Structures Seismically Isolated Using Kinematic Bearings

Dynamic Response of Multi-Storey Structures Seismically Isolated Using Kinematic Bearings

Experimental Identification of Mechanical and Dynamic Characteristics of 3d Printing Specimens

Seismic fragility and intensity measure investigation for rocking podium structures under synthetic pulse‐like excitations

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