توضیحات
ABSTRACT
Recently the experience of recent near source earthquakes such as Northridge, Kobe and Tabas earthquakes have shown that the structures re more vulnerable in the near source earthquakes. This has also shown in many studies. The main reason for that is due to a strong and long period velocity pulse which generates in the near-field (NF) earthquakes. Base isolation systems are one of the methods for reducing the damage and vulnerable in the near source earthquakes, seismic isolation system increase period of vibration which reduce seismic force and the amount of energy transferred into the structure. In this paper, a parametric study has been carried out to study the behavior of based isolated concrete buildings in the near source earthquakes. One base isolated concrete building with 6 stories is considered. The behavior of selected structure has been studied using nonlinear dynamic analysis under three near and three far field (FF) earthquake recorders. A parametric study of various value of stiffness for the base isolation has been studied as well. The results have shown that the responses of building in the NF are very much than FF earthquakes, and the use of base isolation system reduces the base shear and story acceleration of building in NF in contrast FF, but displacement increased. Also the parametric study on the stiffness of base isolation showed that, decreasing stiffness of isolator’s causes the base shear and story acceleration reduced, but this subject for story displacements is not valid.
INTRODUCTION
Occurrence of large earthquakes close to cities in Iran and very countries is unavoidable. After the occurrence earthquake of 1966, in parkfield, California research about near-field (NF) started. The importance of the NF earthquakes characteristic has been noted by several researchers, Naeim.F, Bertero and Chopra are researcher worked about NF. The resulting ground motions will subject structures in the NF region to large, rapid displacement pulses which are not considered in design codes. NF earthquakes cause more damage than FF earthquakes, because NF earthquakes have included large amplitude, long period, and pulse in velocity records. This character can be produce large displacement in the buildings.
Year: 2011
Publisher : Sixth National Congress on Civil Engineering
By : Mahdi Soleimani Rad, Mohsen Tadayn, Fereydoun Rezaei
File Information: English Language/ 8 Page / size: 301 KB
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سال : 1390
ناشر : ششمین کنـگره ملی مهنـدسی عمـران
کاری از : مهدي سليماني راد ،محسن تدين ،فريدون رضايي
اطلاعات فایل : زبان انگلیسی / 8 صفحه / حجم : KB 301
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