TY - JOUR
T1 - Torsional behavior of a non-eccentric structure considering the effect of shear deformations in vertical members
AU - Maki, Shiori
AU - Kohiyama, Masayuki
N1 - Funding Information:
This work was financially supported by the SECOM Science and Technology Foundation and JSPS KAKENHI Grant Number 20H02301.
Publisher Copyright:
© 2022 The Authors. Japan Architectural Review published by John Wiley & Sons Australia, Ltd on behalf of Architectural Institute of Japan.
PY - 2022/10
Y1 - 2022/10
N2 - Torsional moments can occur in a column owing to the geometric nonlinearity when the top of the column undergoes a large displacement in two horizontal directions. Periodically generated torsional moments can excite the torsional mode of a building owing to the internal resonance. For high-rise buildings, there is a risk that long-period seismic motions can cause a non-negligible torsional response due to this phenomenon. To investigate this risk, this study focuses on non-eccentric single-story and two-story shear-type structural models with an aggregate column, which is assumed to be an elastic Timoshenko beam. We derived the equations of motion for the models under horizontal ground motions and confirmed that the equations were identical to those of the models with an aggregate column of an elastic Euler beam. We then performed time-history response analyses of the models satisfying the internal resonance conditions under the input ground motions of harmonic waves, Gaussian white noise acceleration, acceleration records of previous earthquakes, and a long-period design wave. The results showed that the maximum horizontal acceleration at the corner of the top floor slab could be increased by more than 60% of the acceleration at the center of the slab in the worst case.
AB - Torsional moments can occur in a column owing to the geometric nonlinearity when the top of the column undergoes a large displacement in two horizontal directions. Periodically generated torsional moments can excite the torsional mode of a building owing to the internal resonance. For high-rise buildings, there is a risk that long-period seismic motions can cause a non-negligible torsional response due to this phenomenon. To investigate this risk, this study focuses on non-eccentric single-story and two-story shear-type structural models with an aggregate column, which is assumed to be an elastic Timoshenko beam. We derived the equations of motion for the models under horizontal ground motions and confirmed that the equations were identical to those of the models with an aggregate column of an elastic Euler beam. We then performed time-history response analyses of the models satisfying the internal resonance conditions under the input ground motions of harmonic waves, Gaussian white noise acceleration, acceleration records of previous earthquakes, and a long-period design wave. The results showed that the maximum horizontal acceleration at the corner of the top floor slab could be increased by more than 60% of the acceleration at the center of the slab in the worst case.
KW - Timoshenko beam
KW - geometric nonlinearity
KW - high-rise building
KW - shear-type structure
KW - torsional response
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U2 - 10.1002/2475-8876.12290
DO - 10.1002/2475-8876.12290
M3 - Article
AN - SCOPUS:85139496110
SN - 2475-8876
VL - 5
SP - 404
EP - 431
JO - Japan Architectural Review
JF - Japan Architectural Review
IS - 4
ER -