Artikel,
Numerical Investigation of Deflection Amplification Factor in Moment Resisting Frames Using Nonlinear Pushover Analysis
International Journal of Innovations in Engineering and Science, 2 (12): 1-7 (Dezember 2017)
Zusammenfassung
The lateral deflections were obtained from an elastic analysis under seismic loads are much lower than actual deflections which building structures must withstand during strong ground motions. Recent building codes increased the elastic deflection by an amplification factor which is a parameter of over strength factor and ductility ratio. The over strength factor is a coefficient which applied to design forces to find the maximum base shear after forming plastic hinges, and ductility ratio is the capability of structures to withstand nonlinear deflection before the collapse. These seismic parameters can be obtained performing nonlinear pushover analysis and using capacity curve. In this research, five ordinary and special moment resisting frames with three, five, seven, nine, and twelve stories have been subjected to a nonlinear pushover analysis and their capacity curves has been derived. The calculated values for the over strength factor and deflection modification factor were compared with the introduced values in ASCE 7-10. The results of this comparison indicate that ASCE 7-10 values are slightly conservative.
