eva‎luation of the Effect of Seismic Sequence on the Displacement Amplifaction Factor of Steel Frames

1/29/2024 12:00:00 AM

Structures located in seismically active areas are often exposed to earthquakes including the phenomenon of seismic sequence. This phenomenon generally refers to a situation where several earthquakes occur consecutively in the same area in a short period of time. In fact, this phenomenon is described by a main earthquake with moderate to high intensity, which after a short time is accompanied by earthquakes with an intensity comparable to the main earthquake. In this thesis, the effect of successive critical earthquakes on the displacement amplification factor of steel frames has been investigated. In this regard, firstly, the phenomenon of seismic sequence and its importance in the design of structures have been mentioned. Because studies indicate that aftershocks that occur after the main earthquake cause increased damage and death. On the other hand, due to the widespread use of steel structures due to the very quick and easy use of these types of structures, the background of the research investigated in this thesis is to investigate the seismic performance of these structures under seismic sequence in the form of plasticity, damage index, growth and development of plastic joints and Displacement exposed to successive earthquakes that have been discussed earlier in the technical literature is assigned. In the following, three moment resisting steel frames of 3, 7 and 11 stories have been designed and implemented in the Opensees based on the criteria of standard 2800 (4th edition) and the 10th topic of the National Building Regulations (2012 edition). After selecting consecutive critical earthquakes, the steps of extracting and calculating the displacement amplification factor for all the studied frames have been introduced using the results of dynamic analysis in two states of linear and non-linear behavior under single and consecutive earthquakes. In observing the calculations, it was observed that the phenomenon of seismic sequence has led to an increase in the amplification factor of displacement in some of the studied frames.

ضريب بزرگنمايي تغييرمكان , پديده توالي لرزه اي

displacement amplification factor , seismic sequence phenomenon

sanaz rabet

dr.ghodrati amiri