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Seismic assessment of steel frames with the endurance time method

Riahi, H. T ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcsr.2009.12.001
  3. Publisher: 2010
  4. Abstract:
  5. In the endurance time (ET) method, structures are subjected to a specially designed intensifying ground acceleration function and their performance is judged based on their response at various excitation levels. A range of equivalent intensities can be covered in a single numerical or experimental simulation, thus significantly reducing the computational demand as compared to full nonlinear response-history analyses. The applied excitation intensity at various times has been correlated with those of the scaled ground motions. Response spectra of seven ground motions on stiff soil were used to produce intensifying acceleration functions that at each time window produce a response spectrum that is compatible with the template spectrum and proportionally scale up with time. The drift ratios and plastic hinge rotations compare well with those from ground motions in steel frames with various numbers of stories and bays. The locations of plastic hinges are also predicted quite satisfactorily by ET analysis. The sensitivity of the results to the selection of a particular set of ground motions is also studied
  6. Keywords:
  7. Endurance time method ; Steel frames ; Time-history analysis ; Computational demands ; Drift ratio ; Endurance time ; Excitation intensity ; Excitation levels ; Experimental simulations ; Ground accelerations ; Ground motions ; History analysis ; Non-linear response ; Nonlinear seismic analysis ; Plastic hinges ; Response spectra ; Scale-up ; Seismic assessment ; Steel frame ; Time history analysis ; Time windows ; Durability ; Nonlinear analysis ; Seismology ; Steel construction ; Structural frames ; Metal analysis
  8. Source: Journal of Constructional Steel Research ; Volume 66, Issue 6 , 2010 , Pages 780-792 ; 0143974X (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0143974X09002892