DEVELOPMENT OF AN ADAPTIVE PUSHOVER PROCEDURE FOR SEISMIC ASSESSMENT OF MULTISTORY FRAME BUILDINGS

للكاتب

Nayer A. EL-Esnawy

Structural Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt

ABSTRACT

An adaptive pushover procedure incorporating a weighted vector combination strategy of the modal

lateral forces for multistory frame buildings is presented. In the proposed pushover procedure, the

lateral force distribution prescribed along the height of the frame building is continuously updated by

combining the instantaneous modal forces based on the current stiffness and dynamic characteristics

of the building. Unlike standard modal combination rules such as the SRSS and CQC, the weighted

vector combination strategy preserves the sign of each contribution of the modal forces.

The accuracy of the proposed adaptive pushover procedure to evaluate the base shear capacity, floor

displacements and interstory drifts for several low- to medium-rise multistory steel buildings is

validated by comparison with the results determined by nonlinear dynamic analyses using a set of

earthquake ground motions. Also, results obtained by different conventional and adaptive pushover

procedures are shown. It is concluded that the proposed adaptive pushover procedure is a better

alternative to nonlinear dynamic analyses than conventional pushover procedures for seismic

assessment of the performance of multistory frame buildings, considering linearly-elastic and inelastic

states of deformation.

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