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Earthquakes and Structures
  Volume 14, Number 5, May 2018, pages 477-492
DOI: http://dx.doi.org/10.12989/eas.2018.14.5.477
 


A stochastic adaptive pushover procedure for seismic assessment of buildings
Mohammad Jafari and Masoud Soltani

 
Abstract
    Recently, the adaptive nonlinear static analysis method has been widely used in the field of performance based earthquake engineering. However, the proposed methods are almost deterministic and cannot directly consider the seismic record uncertainties. In the current study an innovative Stochastic Adaptive Pushover Analysis, called \"SAPA\", based on equivalent hysteresis system responses is developed to consider the earthquake record to record uncertainties. The methodology offers a direct stochastic analysis which estimates the seismic demands of the structure in a probabilistic manner. In this procedure by using a stochastic linearization technique in each step, the equivalent hysteresis system is analyzed and the probabilistic characteristics of the result are obtained by which the lateral force pattern is extracted and the actual structure is pushed. To compare the results, three different types of analysis have been considered; conventional pushover methods, incremental dynamic analysis, IDA, and the SAPA method. The result shows an admirable accuracy in predicting the structure responses.
 
Key Words
    Bouc-Wen model; stochastic adaptive pushover; stochastic linearization; extreme value
 
Address
Mohammad Jafari and Masoud Soltani: Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
 

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