Effectiveness of modified pushover analysis procedure for the estimation of seismic d - Printable Version +- Civil Engineering Association (https://forum.civilea.com) +-- Forum: eBooks (https://forum.civilea.com/forum-63.html) +--- Forum: Journals, Papers and Presentations (https://forum.civilea.com/forum-74.html) +--- Thread: Effectiveness of modified pushover analysis procedure for the estimation of seismic d (/thread-45634.html) |
Effectiveness of modified pushover analysis procedure for the estimation of seismic d - TAFATNEB - 11-23-2013 Effectiveness of modified pushover analysis procedure for the estimation of seismic demands of buildings subjected to near-fault ground motions having fling step Author: A. Mortezaei and H. R. Ronagh | Size: 6.3 MB | Format: PDF | Quality: Unspecified | Publisher: Nat. Hazards Earth Syst. Sci | Year: 2013 | pages: 15
Near-fault ground motions with long-period pulses have been identified as being critical in the design of structures. These motions, which have caused severe dam- age in recent disastrous earthquakes, are characterized by a short-duration impulsive motion that transmits large amounts of energy into the structures at the beginning of the earth- quake. In nearly all of the past near-fault earthquakes, signif- icant higher mode contributions have been evident in build- ing structures near the fault rupture, resulting in the migra- tion of dynamic demands (i.e. drifts) from the lower to the upper stories. Due to this, the static nonlinear pushover anal- ysis (which utilizes a load pattern proportional to the shape of the fundamental mode of vibration) may not produce ac- curate results when used in the analysis of structures sub- jected to near-fault ground motions. The objective of this pa- per is to improve the accuracy of the pushover method in these situations by introducing a new load pattern into the common pushover procedure. Several pushover analyses are performed for six existing reinforced concrete buildings that possess a variety of natural periods. Then, a comparison is made between the pushover analyses’ results (with four new load patterns) and those of FEMA (Federal Emergency Man- agement Agency)-356 with reference to nonlinear dynamic time-history analyses. The comparison shows that, generally, the proposed pushover method yields better results than all FEMA-356 pushover analysis procedures for all investigated response quantities and is a closer match to the nonlinear time-history responses. In general, the method is able to re- produce the essential response features providing a reason- able measure of the likely contribution of higher modes in all phases of the response Code: *************************************** |