Evaluation of vibration properties of high-rise steel buildings using data of vibration tests and earthquake observations

Satake, Naoki; Yokota, Haruhiko

doi:10.1016/0167-6105(96)00011-6

Cited by 24 publications

(14 citation statements)

References 3 publications

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“…Identified viscous equivalent damping ratio is plotted here with respect to the maximum I-S drift in the same way as frequency in the preceding paragraph ( Figure 6). As many other studies [1,36,37], the ELSA data show a large scatter in damping ratio values either due to structural reasons or estimation errors (including negative values). It seems that the damping ratio remains constant for low to intermediate amplitude values (until 0.01% for calcium silicate and 0.04% for clay).…”

Section: Dependency Of Damping Ratio On Amplitudementioning

confidence: 50%

Quantification of fundamental frequency drop for unreinforced masonry buildings from dynamic tests

Michel

Zapico²,

Lestuzzi

et al. 2010

Earthquake Engng. Struct. Dyn.

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The knowledge of fundamental frequency and damping ratio of structures is of uppermost importance in earthquake engineering, especially to estimate the seismic demand. However, elastic and plastic frequency drops and damping variations make their estimation complex. This study quantifies and models the relative frequency drop affecting low-rise modern masonry buildings and discusses the damping variations based on two experimental data sets: Pseudo-dynamic tests at ELSA laboratory in the frame of the ESECMaSE project and in situ forced vibration tests by EMPA and EPFL. The relative structural frequency drop is shown to depend mainly on shaking amplitude, whereas the damping ratio variations could not be explained by the shaking amplitude only. Therefore, the absolute frequency value depends mostly on the frequency at low amplitude level, the amplitude of shaking and the construction material. The decrease in shape does not vary significantly with increasing damage. Hence, this study makes a link between structural dynamic properties, either under ambient vibrations or under strong motions, for low-rise modern masonry buildings. A value of 2/3 of the ambient vibration frequency is found to be relevant for the earthquake engineering assessment for this building type. However, the effect of soil-structure interaction that is shown to also affect these parameters has to be taken into account. Therefore, an analytical methodology is proposed to derive first the fixed-base frequency before using these results.

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Section: Dependency Of Damping Ratio On Amplitudementioning

confidence: 50%

Quantification of fundamental frequency drop for unreinforced masonry buildings from dynamic tests

Michel

Zapico²,

Lestuzzi

et al. 2010

Earthquake Engng. Struct. Dyn.

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show abstract

“…Permanent instrumentation of buildings makes it possible to study these parameters under different earthquakes excitation. Previous studies have shown that the dynamic characteristics often vary with vibration amplitude [5][6][7]. It is, therefore, important to examine the behaviour of buildings under different excitation scenarios.…”

Section: Introductionmentioning

confidence: 99%

“…To provide a simple quantification of the effects of SSI on the response of the building in this study, modal vibration parameters were sought through N4SID technique for the pseudoflexible base case and the flexible base case using input-output pairs consisting of a combination of free field, foundation, and superstructure level recordings as explained in (3)- (5). For building A, sensors 6 and 7 were taken as the inputs, while sensors 3, 4, and 5 as the outputs for the pseudoflexible base case, whereas sensor 10 (the free field sensor) as the input and sensors 3, 4, 5, 6, and 7 as the outputs for flexible base case.…”

mentioning

confidence: 99%

Evaluation of Seismic Response Trends from Long-Term Monitoring of Two Instrumented RC Buildings Including Soil-Structure Interaction

Butt

Omenzetter

2012

Advances in Civil Engineering

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This paper presents analyses of the seismic responses of two reinforced concrete buildings monitored for a period of more than two years. One of the structures was a three-storey reinforced concrete (RC) frame building with a shear core, while the other was a three-storey RC frame building without a core. Both buildings are part of the same large complex but are seismically separated from the rest of it. Statistical analysis of the relationships between maximum free field accelerations and responses at different points on the buildings was conducted and demonstrated strong correlation between those. System identification studies using recorded accelerations were undertaken and revealed that natural frequencies and damping ratios of the building structures vary during different earthquake excitations. This variation was statistically examined and relationships between identified natural frequencies and damping ratios, and the peak response acceleration at the roof level were developed. A general trend of decreasing modal frequencies and increasing damping ratios was observed with increased level of shaking and response. Moreover, the influence of soil structure interaction (SSI) on the modal characteristics was evaluated. SSI effects decreased the modal frequencies and increased some of the damping ratios.

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“…Previous studies have shown that the dynamic characteristics tend to vary with vibration amplitude [1][2][3] . It is, therefore, important to see the behavior of buildings under different excitation scenarios.…”

Section: Introductionmentioning

confidence: 99%

Seismic response trends evaluation via long term monitoring and finite element model updating of an RC building including soil-structure interaction

Butt

Omenzetter

2012

SPIE Proceedings

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This paper presents a study on the seismic response trends evaluation and finite element model updating of a reinforced concrete building monitored for a period of more than two years. The three storey reinforced concrete building is instrumented with five tri-axial accelerometers and a free-field tri-axial accelerometer. The time domain N4SID system identification technique was used to obtain the frequencies and damping ratios considering flexible base models taking into account the soil-structure-interaction (SSI) using 50 earthquakes. Trends of variation of seismic response were developed by correlating the peak response acceleration at the roof level with identified frequencies and damping ratios. A general trend of decreasing frequencies was observed with increased level of shaking. To simulate the behavior of the building, a three dimensional finite element model (FEM) was developed. To incorporate real in-situ conditions, soil underneath the foundation and around the building was modeled using spring elements and non-structural components (claddings and partitions) were also included. The developed FEM was then calibrated using a sensitivity based model updating technique taking into account soil flexibility and non-structural components as updating parameters. It was concluded from the investigation that knowledge of the variation of seismic response of buildings is necessary to better understand their behavior during earthquakes, and also that the participation of soil and non-structural components is significant towards the seismic response of the building and these should be considered in models to simulate the real behavior.

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Evaluation of vibration properties of high-rise steel buildings using data of vibration tests and earthquake observations

Cited by 24 publications

References 3 publications

Quantification of fundamental frequency drop for unreinforced masonry buildings from dynamic tests

Quantification of fundamental frequency drop for unreinforced masonry buildings from dynamic tests

Evaluation of Seismic Response Trends from Long-Term Monitoring of Two Instrumented RC Buildings Including Soil-Structure Interaction

Seismic response trends evaluation via long term monitoring and finite element model updating of an RC building including soil-structure interaction

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