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هفتمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله
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  • lower bound analysis of slopes under variable repeated dynamic loads by strnght reduction method

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    • تاریخ ارائه: 1394/02/01
    • تاریخ انتشار در تی پی بین: 1394/02/01
    • تعداد بازدید: 696
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     stability of slopes against seismic loads has always been a great cause of concern in seismic regions. pseudo-static, dynamic and mixture of pseudo-static and dynamic methods are utilized to evaluate the behaviour of slopes against earthquake loading. common to all the aforementioned approach is that all of them suppose earthquake loads is imposed on the slope for one time only. in reality, slopes can be subjected to many earthquakes with different characteristics during their lifetime. in general, response of mechanical systems to repeated loads might be classified into three groups. 1) if the intensity of the applied load is small enough, the whole body reflects back to its initial position and behaves solely in an elastic manner. 2) under large repeated load intensity, plastic strain accumulation results to the collapse of the system due to excessive deformation (ratcheting). 3) a range of load intensity in between the first two groups can be imagined under which, the loaded body initially develop plastic strains, but plastic strain decrement gradually tends to diminish so that the system behaves elastically after some load repeatition. this kind of phenomenon is recognized as shakedown.

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