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Influence of concurrent horizontal and vertical ground excitations on the collapse margins of non-ductile RC frame buildings

  • Farsangi, E. Noroozinejad (SERC, International Institute of Earthquake Engineering and Seismology) ;
  • Yang, T.Y. (International Joint Research Laboratory of Earthquake Engineering) ;
  • Tasnimi, A.A. (Department of Civil and Environmental Engineering, Tarbiat Modares University)
  • 투고 : 2016.01.13
  • 심사 : 2016.06.10
  • 발행 : 2016.08.25

초록

Recent earthquakes worldwide show that a significant portion of the earthquake shaking happens in the vertical direction. This phenomenon has raised significant interests to consider the vertical ground motion during the seismic design and assessment of the structures. Strong vertical ground motions can alter the axial forces in the columns, which might affect the shear capacity of reinforced concrete (RC) members. This is particularly important for non-ductile RC frames, which are very vulnerable to earthquake-induced collapse. This paper presents the detailed nonlinear dynamic analysis to quantify the collapse risk of non-ductile RC frame structures with varying heights. An array of non-ductile RC frame architype buildings located in Los Angeles, California were designed according to the 1967 uniform building code. The seismic responses of the architype buildings subjected to concurrent horizontal and vertical ground motions were analyzed. A comprehensive array of ground motions was selected from the PEER NGA-WEST2 and Iran Strong Motions Network database. Detailed nonlinear dynamic analyses were performed to quantify the collapse fragility curves and collapse margin ratios (CMRs) of the architype buildings. The results show that the vertical ground motions have significant impact on both the local and global responses of non-ductile RC moment frames. Hence, it is crucial to include the combined vertical and horizontal shaking during the seismic design and assessment of non-ductile RC moment frames.

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참고문헌

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  3. Vibration Control of a Tall Benchmark Building under Wind and Earthquake Excitation vol.26, pp.2, 2016, https://doi.org/10.1061/(asce)sc.1943-5576.0000569
  4. The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures vol.25, pp.2, 2022, https://doi.org/10.1177/13694332211056106