A pushover seismic analysis method for asymmetric and tall buildings

作者：Hsiao Fu Pei; Oktavianus Yusak; Ou Yu Chen^*

来源：Journal of the Chinese Institute of Engineers, 2015, 38(8): 991-1001.

DOI：10.1080/02533839.2015.1056553

• pushover
• higher mode effects
• nonlinear dynamic analysis
• N2 method

A pushover seismic analysis method based on the extended N2 method is proposed. Compared to the extended N2 method, the proposed method has four modifications that account for nonlinear higher mode effects. In the first modification, a lateral load based on the equivalent static forces from the dominant dynamic modes of a building combined using the effective mass ratio is used in pushover analysis to consider the higher mode effect in elevation. In the second modification, the total torsional mode effective mass factor is used to modify target displacement in pushover analysis to consider inelastic higher mode effect in plan. In the third modification, the coefficient of torsion (CT) is determined by combining the CT from pushover analysis with that from response spectrum analysis using a contribution factor depending on the ductility level. In the fourth modification, the maximum inter-story drift is derived based on target displacement while considering the effects of story height, ductility, and building period. These modifications are verified using a 14-story building with 10% eccentricity and medium to high structural ductility. Analytical results show that the proposed method predicts better target displacement, CT, and maximum inter-story drift than the N2 and extended N2 method.

• 出版日期2015-12