Evaluating Main Parameters Effects of Near-Field Earthquakes on the Behavior of Concrete Structures with Moment Frame System

Amplitude and frequency content are two important features of the earthquake which are different for near and far-fault earthquakes and in most of the standards, effects of the near -field earthquakes in loading are not considered. So study and comparison of these effects on structures is necessary. In this paper, structures operation against near and far fault earthquakes for two near sites and two far sites have been investigated. For this purpose, in order to achieve operation point of a six stairs structural model with mean lateral bending frame resistant system, from special plan spectrums of two different sites, near and far fault, which are obtained from seismic hazard analysis is used. Evaluation of effects due to near and far fault earthquakes based on the Iran’s standard 2800 ranges on operation point and also comparison of operation effects of near and far fault spectrums with Iran’s standard are results of this research work. In continues, after presentation of obtained results from time history analyses, some suggestions have been proposed for design correction based on the regulations in near -field earthquakes

Reducing the lateral displacement of lead rubber bearing isolators under the near field earthquakes by crosswise dissipaters connected to rigid support structure: earthquake engineering

The purpose of base isolation is to absorb earthquake energy, prolong the life of the structure, and enable the structure to be similar to a rigid body. However, since resonance can occur due to the closeness of the period of structures to the long period and large velocity pulses of the near field earthquakes, the stability of these buildings greatly reduces, and with the large displacement above isolation level, sometimes, tendency of overturning is created in isolators leading to their destruction. The main objective of this study is to significantly reduce the lateral displacement of base isolation subjected to near field earthquakes. In this research, seismic response calculation has been carried out for five steel moment frame structure with the 3, 5, 8, 11, and 14 stories in two states of with and without stiff core structure and energy dissipaters. The analyses has been done under fourteen scaled records of seven near-source and seven far-source earthquakes. It has been shown that the lateral displacement of base isolation system can be reduced by 87% for low-rise buildings, and 77% for high-rise buildings

Evaluating Main Parameters Effects of Near-Field Earthquakes on the Behavior of Concrete Structures with Moment Frame System

Amplitude and frequency content are two important features of the earthquake which are different for near and far-fault earthquakes and in most of the standards, effects of the near -field earthquakes in loading are not considered. So study and comparison of these effects on structures is necessary. In this paper, structures operation against near and far fault earthquakes for two near sites and two far sites have been investigated. For this purpose, in order to achieve operation point of a six stairs structural model with mean lateral bending frame resistant system, from special plan spectrums of two different sites, near and far fault, which are obtained from seismic hazard analysis is used. Evaluation of effects due to near and far fault earthquakes based on the Iran’s standard 2800 ranges on operation point and also comparison of operation effects of near and far fault spectrums with Iran’s standard are results of this research work. In continues, after presentation of obtained results from time history analyses, some suggestions have been proposed for design correction based on the regulations in near -field earthquakes

Evaluating Main Parameters Effects of Near-Field Earthquakes on the Behavior of Concrete Structures with Moment Frame System

Amplitude and frequency content are two important features of the earthquake which are different for near and far-fault earthquakes and in most of the standards, effects of the near -field earthquakes in loading are not considered. So study and comparison of these effects on structures is necessary. In this paper, structures operation against near and far fault earthquakes for two near sites and two far sites have been investigated. For this purpose, in order to achieve operation point of a six stairs structural model with mean lateral bending frame resistant system, from special plan spectrums of two different sites, near and far fault, which are obtained from seismic hazard analysis is used. Evaluation of effects due to near and far fault earthquakes based on the Iran’s standard 2800 ranges on operation point and also comparison of operation effects of near and far fault spectrums with Iran’s standard are results of this research work. In continues, after presentation of obtained results from time history analyses, some suggestions have been proposed for design correction based on the regulations in near -field earthquakes