An adaptive modal pushover procedure for asymmetric-plan buildings

作者：Shakeri Kazem^*; Tarbali Karim; Mohebbi Mohtasham

来源：Engineering Structures, 2012, 36: 160-172.

DOI：10.1016/j.engstruct.2011.11.032

• 3D pushover
• Nonlinear analysis
• Asymmetric-plan
• Adaptive
• Modal
• Story shear
• Torque
• Energy

An innovative single-run adaptive modal pushover procedure based on the modal story shear and torque has been developed for seismic assessment of asymmetric-plan buildings. In which the load pattern consists of the lateral forces and torques which are derived from the instantaneous combined modal story shear and torque profiles in each step. The contribution of the higher and torsional modes and the effects of the changes in the structural properties during the inelastic domain are considered. Although the quadratic combination rule is used in defining the load pattern, the effects of reversal signs in the higher modes are simulated in the load pattern. The interaction between modes in the inelastic phase is reflected in the single load pattern and the structural responses during the analysis are easily traced through the single-run procedure. Furthermore the capacity spectrum curve is obtained from a formulation based on the modal energy concept and the ambiguity of choosing controlling point to obtain the target displacement in asymmetric-plan buildings has been eliminated. Accuracy of the proposed method has been verified on three asymmetric-plan buildings under different earthquake records. The results indicate that this method could predict the results of the nonlinear time history analysis appropriately.

• 出版日期2012-3