Seismic Behavior of Jacket Offshore Platform Subjected to Near and Far Field Ground Motions

نویسندگان

  • A. Sarvghad Moghadam International Institute of Earthquake Engineering and Seismology, Tehran, Iran.
  • F. Azarsina Department of Marine Industries, Science and Research Branch, Islamic Azad University, Tehran, Iran
  • K. Kashizadeh Department of Marine Industries, Science and Research Branch, Islamic Azad University, Tehran, Iran
چکیده مقاله:

Offshore structures such as jacket platforms have to inevitably be designed against  sever  environmental actions. In seismically active areas these structures also become susceptible to earthquake excitations. Strong ground motions recorded  in recent earthquakes, including the 1995 Kobe, Japan, 1999 Chi-chi, Taiwan and 1999 Kocaeli, Turkey earthquakes, revealed that the dynamic motions in near fields are dominated by a large, narrow band, long period pulse caused by rupture directivity effects. Sever damages have been reported with specific bridges, quay walls and multistory buildings near to the shaking fault. It was been noticed that the dynamic characteristics of these structures were close to the characteristics of the rupture directivity and felling pulses.This paper deals with the behavior of existing jacket platform under near field earthquake loading. As an example seismic assessment of the existing 4 legged service platform placed in Persian Gulf is presented. A finite element approach utilizing “Opensees” Standard software has been chosen for this study. A dynamic non-linear direct integration analysis method has been used. Seven, near and far fault records have been examined.  In general it has been found that the far field excitations produce more critical consequence for the jacket offshore platform as compared with those from the corresponding near field excitations. It has been noticed that the correspondence between the dominant frequency of the record and the main natural frequency of the jacket structure can be used as a criteria to decide whether a far or near field Earthquake is more critical.  

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Evaluation of 2D concentrically braced frames with cylindrical dampers subjected to near-field earthquake ground motions

Near field earthquakes have imposed major damage to buildings in the past years. In some cases, the intensity of such damage is too considerable to be disregarded. The most effective way to improve seismic performance of buildings is applying a seismic control technique. The cylindrical friction damper is one of these methods, which has become popular for its desirable performance in the energy...

متن کامل

Seismic Rehabilitation of Liquid Storage Tanks using Friction Pendulum Base Isolation subjected to the Near-Fault Ground Motions

Cylindrical liquid storage tanks are considered as vital structures in industrial complex whose nonlinear dynamic behavior is of crucial importance. Some of these structures around the world have demonstrated poor seismic behavior over the last decades. There are several methods and techniques for rehabilitation and reducing damages in these structures which among them passive control devices, ...

متن کامل

Seismic behavior of RBS connections at near and far field earthquakes

Moment-resisting frames have extensive usage in earthquake-prone areas and high ability in energy dissipation.After the earthquake in Northridge 1994,Kobe 1995 fixed connections of steel structures have shown poor performance and generally they were caught brittle fracture of beam flange weld to the column.In order to remedy to avoid similar situations in future earthquakes,researchers introduc...

متن کامل

Investigation of seismic damage index due to water level changes in reservoir through nonlinear dynamic analysis under Far-Fault and Near-Fault ground motions

In this study, reservoir water level effects on nonlinear dynamic response of concrete gravity dams are investigated. For this purpose, the nonlinear behavior of the dam concrete is captured using the concrete damage plasticity (CDP) on the non associated flow rule assumption. Water in the reservoir is represented by the Lagrangian (displacement-based) fluid finite elements. The program ABAQUS ...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


عنوان ژورنال

دوره 4  شماره 2

صفحات  77- 88

تاریخ انتشار 2014-06-01

با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023