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Incorporation of Torsional & Higher-Mode Responses in Displacement-Based Seismic Design of Asymmetric RC Frame Buildings

Department of Civil and Environmental Engineering, Hanyang University, Ansan 15588, Korea
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Appl. Sci. 2019, 9(6), 1095; https://doi.org/10.3390/app9061095
Received: 19 December 2018 / Revised: 9 March 2019 / Accepted: 11 March 2019 / Published: 15 March 2019
(This article belongs to the Section Civil Engineering)
Direct Displacement-Based Design (DDBD) is currently a widely used displacement-based seismic design method. DDBD accounts for the torsional response of Reinforced Concrete (RC) frame buildings by using semi-empirical equations formulated for wall-type buildings. Higher-mode responses are incorporated by using equations obtained from only a few parametric studies of regular planar frames. In this paper, there is an attempt to eliminate torsional responses by proportioning frames’ secant stiffnesses so that the centers of rigidity and supported mass (the mass on and above each story) coincide. Once the torsional rotations are significantly reduced and only translational motions are achieved, higher-mode responses are included using a technique developed by the authors in their recent paper. The efficiency of the proposed design procedure in fulfilling the intended performance objective is checked by two plan-asymmetric 20-story RC frame building cases. Case-I has the same-plan configuration while Case-II has a different-plan configuration along the height. Both cases have different bay widths in orthogonal directions. Verification of the case studies by Nonlinear Time History Analysis (NTHA) has shown that the proposed method results in designs that satisfy the performance objective with reasonable accuracy without redesigning members. It is believed that a step forward is undertaken toward rendering design verification by NTHA less necessary, thereby saving computational resources and effort. View Full-Text
Keywords: effective modal superposition; direct displacement-based design; performance-based seismic design; plan-asymmetric RC frame buildings; torsion effects; higher-mode effects effective modal superposition; direct displacement-based design; performance-based seismic design; plan-asymmetric RC frame buildings; torsion effects; higher-mode effects
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MDPI and ACS Style

Abebe, B.H.; Lee, J.S. Incorporation of Torsional & Higher-Mode Responses in Displacement-Based Seismic Design of Asymmetric RC Frame Buildings. Appl. Sci. 2019, 9, 1095. https://doi.org/10.3390/app9061095

AMA Style

Abebe BH, Lee JS. Incorporation of Torsional & Higher-Mode Responses in Displacement-Based Seismic Design of Asymmetric RC Frame Buildings. Applied Sciences. 2019; 9(6):1095. https://doi.org/10.3390/app9061095

Chicago/Turabian Style

Abebe, Beka H., and Jong S. Lee 2019. "Incorporation of Torsional & Higher-Mode Responses in Displacement-Based Seismic Design of Asymmetric RC Frame Buildings" Applied Sciences 9, no. 6: 1095. https://doi.org/10.3390/app9061095

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