كليدواژه :
شمع باله دار , بارجانبي , اجزاي محدود , مدلسازي عددي , آباكوس
چكيده فارسي :
زماني كه ظرفيت باربري خاك براي استفاده از پيه اي سطحي مناسب نباشد، معمولاً از شمع ها استفاده ميشود. شمع ها در بيشتر موارد علاوه بر بارهاي قائم، تحت بارهاي جانبي نيز قرار ميگيرند. شمع هاي استفاده شده در پايه پلها، توربين هاي بادي، سكوهاي دريايي و ... تحت بارهاي جانبي بزرگي قرار ميگيرند و در طراحي شمع هاي اين سازه ها، بار جانبي غالب است. استفاده از باله ها پيرامون شمع، براي افزايش ظرفيت باربري جانبي روش نسبتا جديدي ميباشد، بنابراين بررسي شده است. همچنين (ABAQUS) در اين پژوهش، رفتار شمع هاي باله دار منفرد در خاك ماسه اي به صورت سه بعدي با استفاده از نرمافزار اجزاي محدود عملكرد شمعهاي باله دار با شمع هاي بدون باله مقايسه شده است. نتايج به دست آمده براي شمع هاي باله دار نشان ميدهد كه استفاده از باله ها منجر به افزايش چشمگير ظرفيت باربري جانبي شمع ها نسبت به شمع هاي معمولي بدون باله ميشود.
چكيده لاتين :
Piles are a common type of foundation, and in the context of offshore energy supply, they are used widely as
foundations for wind farms or as anchors for floating facilities for oil and gas production. In both these
applications, the pile response under lateral loading is critical, although the latter application is more capacity
sensitive whereas the former is deformation sensitive. All piles are under small or large lateral loads and the
behavior of the piles under the lateral load must be controlled, but for most of the time. The lateral load can
cause a spacing between the pile and the surrounding soil in the upper layers. If such a situation happens, it
cannot be assured for the vertical load bearing capacity in the upper layers. Usually, the effect of lateral loads
on the design and construction of the pile is ignored due to its small size versus vertical load, but in some
cases, the analysis of the pile is necessary under lateral loads and should be considered using the appropriate
methods. The piles used in the base of bridges, wind turbines, piers, etc. are subjected to relatively large lateral
loads, and in the pile design of these structures, the lateral effect is dominated. One of the ways to increase the
lateral load bearing capacity is to use the technique of fin piles, which is a relatively new method. Fin piles are
one type of piles that have four or more metal sheets that are welded at different angles to the pile environment.
The behavior of fin piles is difficult to explain using simple pile–soil theories or two dimensional numerical
analyses because of the complicated geometry of the piles. Due to the progress of numerical methods and the
use of three-dimensional software, numerical modeling of the pile and soil environment is possible more
precisely. A fundamental study of soil response of piles subjected to static lateral loads in sand is conducted
using the non-linear finite element approach. The effects of pile properties, i.e., length and diameter, and the
effect of fins i.e., fin length and fin width on the pile response of a pile subjected to lateral loads are also
investigated. In this research, the behavior of singular fin piles under lateral loading in sandy soil is modeled
using 3D finite element software (ABAQUS) The ABAQUS program is a robust engineering simulation
program that, based on finite element method. Abaqus is capable of solving various problems from simple to
complex nonlinear problems. With a large library of materials and elements, the program is capable of
modeling materials such as metals, rubber, polymer, composites, concrete, soil and rock. In addition to solving
structural problems, the ABAQUS program is able to solve complex heat transfer problems, thermal-electrical
analysis, and soil mechanics problems. In this research, the performance of finned piles with respect to ordinary
piles has been compared. The results show that the use of fins causes an appreciable increase in the bearing
capacity of the piles compared to ordinary piles without fins.
