A method for computing interstory drift spectra with consideration of gravity effects

作者：Xie Junju; Wen Zengping^*; Hu Yuxian

来源：Earthquake Engineering and Engineering Vibration, 2010, 9(4): 513-521.

DOI：10.1007/s11803-010-0033-1

• cantilever shear-beam model
• gravity
• pulse
• drift spectrum
• Wenchuan earthquake
• Bessel series

Vertical loads such as gravity may have an important influence on the seismic response of buildings. In this paper, the continuous shear-beam model is extended to study the seismic demand of shear buildings with consideration of the gravity load effect under near-field ground motions. An analytical solution of the free motion equation of as gravity shear beam model is provided in terms of a Bessel series. A method for computing interstory drift spectra is proposed. The interstory drift spectra for two near-field records with distinct pulses are presented to illustrate the effects of gravity and the damping ratio. The interstory drift spectra are also used to analyze the spectral characteristics of near fault ground motion during the 2008 Wenchuan earthquake. The effects of the gravity load ratio, damping ratio and higher modes are investigated and discussed.

• 出版日期2010-12
• 单位中国地震局