مقايسه عددي تغييرشكل هاي افقي و قائم پي هاي سطحي باابعادهندسي مختلف تحت بارگذاري هاي متنوع

Numerical comarison between horizontal and vertical deformations of shallow foundations with different dimensions under various loads

مطالعه حاضر تحقيقي جهت بررسي و مقايسه شكل پي ها بر روي ۳ لايه خاك با مشخصات ماسه متراكم،ماسه متوسط و خاك رس،با استفاده از بررسي‌ منحني هاي جابجايي _كرنش انجام پذيرفته است.به منظوربررسي تاثيربارگذاري هاي مختلف برروي شكل هاي متفاوت ازپي سطحي،ازنرم افزارالمان محدودPLAXIS استفاده شده است.دراين راستا3مدل پي سطحي نواري بابعد20 متري،نواري بابعد30متري وپي دايروي بابعد5متري ساخته شده و4مدل بارگذاري ازنوع بارگذاري يكنواخت برروي كل سطح پي،بارگذاري نقطه اي درمركزپي،بارگذاري غيريكنواخت و بارگذاري يكنواخت باابعادمحدوددرمركزپي برپي هاي سطحي اعمال گرديدنتايج بدست آمده نشان دادكه پي نواري بابعد30مترميزان تحمل بيشتري رانسبت به بارهاي وارده ازخودنشان داد.

The present study was conducted to investigate and compare the shape of the plies on three layers of soil including, dense sand, moderate sand and clay using survey of the displacement-strain curves. In order to investigating the effects of different loading on varied shallow foundation, PLAXIS finite element software has been used. In this way, three models shallow foundation, 20 meters, 30 meters strip foundation and 5 meters diameter circular foundation were made, also four types loading , uniform loading on the total surface, Center-Point Loading on the center of foundation, uniform and non-uniform loading by limited dimensions on center of foundation in the center of the surface were applied.The results showed that the 30 meters strip foundation can sustain a greater applied loads than the others.