Abstract
The dual wall-frame structure consists of a structural wall system and a rigid frame system, and there is a strong interaction between the frame and wall systems in the top and bottom of structures. Therefore, the structural response of the dual wall-frame structures is entirely different from that of the single structural system. This paper presented a modification on the modal-based ground motion selection (MGMS) procedure for concerning the distinct structural behaviour of wall-frame structures to properly consider the effect of frequency contents combination in the time domain (FCCTD) of input ground motion (IGMs) in selecting IGMs for the nonlinear response time history analysis (NLRHA) of the structure. The MGMS procedure for wall-frame structures (MGMS-WF) employed a pseudo-first mode with a uniformly distributed mode shape and selected IGMs that induced the most significant interaction of the first three modes or the pseudo-first, second and third modes from a suite of seed IGMs for the NLRHA of wall-frame structures. A comprehensive case study was conducted involving four reinforced concrete (RC) wall-frame structures with different heights and combinations of wall and frame. To verify the capability of the MGMS-WF in consistently selecting proper IGMs for the NLRHA of wall-frame structures, design spectra and conditional mean spectra with various construction conditions were employed as target spectra to select and scale seed IGMs. The results show that the seismic demands of wall-frame structures computed using the MGMS-WF-IGMs have high yet consistent reliability.
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Abbreviations
- CMS:
-
Conditional mean spectrum
- CM-UW:
-
Uniformly weighted closest spectra matching procedure
- CM-VW:
-
Variably weighted closest spectra matching procedure
- DS:
-
Design spectrum
- FCCFD:
-
Frequency contents combination in the frequency domain
- FCCTD:
-
Frequency contents combination in the time domain
- HPR:
-
Hinge plastic rotation
- IDR:
-
Inter-storey drift ratio
- IGMs:
-
Input ground motions
- MGMS:
-
Modal-based ground motion selection
- MGMS-WF:
-
Modal-based ground motion selection for wall-frame structure
- MSE:
-
Mean computed weighted mean squared error
- NL-ESDOF:
-
Nonlinear equivalent single-degree-of-freedom system
- NLRHA:
-
Nonlinear response time history analysis
- SDOF:
-
Single-degree-of-freedom system
- \(\mathbf{u}\) :
-
Displacement vector of floor
- \({a}_{n}(\mathrm{t})\) :
-
Normalised top displacement time history of mode n
- \(\overline{{d }_{ijk}}\) :
-
Benchmark demands ith storey of wall-frame k for motion set j
- \({d}_{M}^{ijk}\) :
-
Seismic demands at ith storey of wall-frame k calculated using IGMs from selection method M for motion set j
- \({D}_{n}\) :
-
Peak displacement of mode n
- \({d}_{n}\) :
-
Displacement of ESDOFs of mode n
- \({D}_{n}(t)\) :
-
Top displacement time history of the mode n
- \({d}_{ny}\) :
-
Yield displacement of ESDOFs of mode n
- \({F}_{sn}\) :
-
Restoring force of ESDOFs of mode n
- \({F}_{sny}\) :
-
Yield force of ESDOFs of mode n
- \(\mathbf{i}\) :
-
Influence vector
- \({L}_{n}\) :
-
Modal excitation factor of mode n
- m, c and k :
-
Mass, damping, and stiffness matrices
- \({M}_{n}\) :
-
Generalised mass of mode n
- \({S}_{aj}(T)\) :
-
Spectrum acceleration value of motion j at period T
- \({S}_{a}^{t}(T)\) :
-
Spectrum acceleration value of target spectra at period T
- \({S}_{d1}\) :
-
Design spectrum acceleration at 1.0 s
- \({S}_{ds}\) :
-
Design spectrum acceleration at 0.2 s
- \({t}_{k}\) :
-
Any time point within the duration of IGM
- \({T}_{j0}\) :
-
Duration of motion j
- \({T}_{L}\) :
-
Long-period transition period
- \({T}_{n}^{*}\) :
-
Vibration period of NL-ESDOF of mode n
- \(\widehat{{u}_{jn}}\) :
-
The maximum displacement of NL-ESDOF of mode n under motion j
- \({u}_{jn}({t}_{k})\) :
-
Displacement of NL-ESDOF of mode n under motion j at time tk
- \({u}_{rn}\) :
-
Roof displacement of mode n
- \({V}_{bn}\) :
-
The base shear force of mode n
- \({\alpha }_{i}\) :
-
Modal mass coefficient of mode i
- \({\beta }_{j}\) :
-
Maximum modal combination factor of motion j
- \({\beta }_{jk}\) :
-
Maximum modal combination factor of motion j at time tk
- \({\Gamma }_{n}\) :
-
The modal participating factor of mode n
- \({\updelta }_{M}^{ijk}\) :
-
The relative difference between the benchmark demands of motion set j and demands computed using IGMs from selection method M at the ith storey of wall-frame k
- \({\phi }_{n}\) :
-
Mode shape of mode n
- \({\phi }_{rn}\) :
-
Mode shape value at the roof of mode n
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Acknowledgements
The financial supports from the National Natural Science Foundation of China under Grant No. 52108454, Research Start-up Fund for High-level Talents of Huaqiao University under Grant No. 20191XD042 are gratefully acknowledged.
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Y.L.: methodology, conceptualization, writing—original draft, funding acquisition, project administration, writing—review & editing. Q.H.: conceptualization, methodology, writing—original draft. Y.L.: conceptualization, writing—review & editing, Z.G.: supervision, conceptualization, writing—review & editing. H.K.: writing—review & editing, investigation. X.W.: writing—review & editing, investigation.
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Liu, Y., Huang, Q., Liu, Y. et al. Modal-based ground motion selection procedure for nonlinear response time history analysis of dual wall-frame structures. Bull Earthquake Eng 20, 765–793 (2022). https://doi.org/10.1007/s10518-021-01264-0
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DOI: https://doi.org/10.1007/s10518-021-01264-0