Abstract
In the seismic design of acceleration-sensitive nonstructural components, floor acceleration response spectra are commonly selected for analysis, which has proven to be effective in practice. To accurately study the floor acceleration response spectrum of a reinforced concrete structure under earthquakes, a 3-story reinforced concrete frame structure designed based on Chinese codes was built and placed on a shaking table for testing to obtain actual floor acceleration response for investigation of spectral characteristics. In addition, a set of finite element models of reinforced concrete frame buildings were analyzed to better study the variation of floor acceleration peaks and response spectra with different modal periods. The results show that floor dynamic magnification is highly related to structural dynamic characteristics and building’s relative height. Obvious peaks are observed in the floor response spectrum, which correspond to the structural modal periods. The values of the spectra, particularly the peaks, show a strong correlation with the floor level and the damping ratios of nonstructural components. Based on the observations gained from shaking table tests and numerical study, a function for predicting the floor dynamic magnification factor and a method for generating the spectral amplification factor of the floor are proposed. Then the findings acquired from the test, numerical study, and existing methods were applied for the validation of the proposed methods. It is shown that the proposed floor dynamic magnification factor prediction function and spectral amplification factor prediction method are useful for the seismic design of nonstructural components in various reinforced concrete structures, taking into account the structural dynamic characteristics, the floor level, and the damping ratio of nonstructural components.
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Data availability
The results of numerical simulation generated or used during the study are available from the corresponding author by request.
Abbreviations
- NSCs:
-
Nonstructural components
- PFA:
-
Peak floor acceleration
- MDOF:
-
Multi-degrees-of-freedom
- SDOF:
-
Single-degree-of-freedom
- PGA:
-
Peak ground acceleration
- FRS:
-
Floor acceleration response spectrum
- RC:
-
Reinforced concrete
- THAs:
-
Time-history analyses
- CAF:
-
Component dynamic amplification factor
- PCA:
-
Peak component acceleration
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Acknowledgements
This paper was supported by the National Key R&D Program of China [Grant number 2019YFC1521000] and Fundamental Research Funds for the Central Universities of China [Grant number KCJB0521020536]. The financial supports are gratefully acknowledged.
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Zou, X., Yang, W., Liu, P. et al. Floor acceleration amplification and response spectra of reinforced concrete frame structure based on shaking table tests and numerical study. Archiv.Civ.Mech.Eng 23, 156 (2023). https://doi.org/10.1007/s43452-023-00648-0
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DOI: https://doi.org/10.1007/s43452-023-00648-0