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Effect of Using Equivalent Driving Energy on Small Model Driven Pile Capacity
تأثير أستخدام طاقة الدق المكافئة على تحمل موديلات مصغرة من ركائز الدق

Authors: Kais Taha Shlash --- Mohammed A. Al- Neami --- Ahmed Majeed Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 7 Part (A) Engineering Pages: 1229-1238
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Physical modeling is performed in order to study particular cases of the behavior of prototype and to validate theoretical and/or empirical hypotheses. However, most physical models will be constructed at much smaller scales than the prototype precisely because it is desired to obtain information about expected patterns of response more rapidly and with closer control over model details than would be possible with full-scale testing. The main problem associated with physical model tests is the stress levels and soil particle size effects. These points should be considered which require deep and thorough research when studying the behavior of small scale model piles in sand. The tests indicate that the number of blows recorded when driving the model pile is affected by pile diameter more than with pile length. As well as, the heavier hammer shows precedence in bearing capacity than the light hammer because it leads to upgrade the soil properties during pile driving.

النمذجة الفيزيائية تنجز لغرض دراسة الجوانب العملية لتصرف النموذج الأصلي ولتأييد الفرضيات النظرية او التجريبية. مع ذلك, أغلب النماذج الفيزيائية سوف تبنى بواسطة مقاييس أكثر صغراً˭ من النموذج الأصلي وبشكل دقيق لأنه مطلوب الحصول على معلومات عن أنماط أستجابة متوقعة بسرعة وبتحكم خلال تفاصيل النموذج على أن يكون ممكنا˭ مع فحص النموذج الكامل. المشكلة الرئيسية المصاحبة لنتائج الموديلات الفيزيائية هي تأثير مستويات الأجهاد وحجم حبيبات التربة. هذه النقاط يجب ان تؤخذ بنظرالأعتبار والتي تتطلب بحث عميق وشامل عند دراسة نماذج الركائز المصغرة في الرمل. الفحوصات تشير إلى إنه عدد الضربات المسجلة عند دق نموذج الركيزة يتأثر بالقطر أكثر من طول الركيزة. أيضا, تظهر المطرقة الأثقل أفضلية عن المطرقة الأخف في قابلية التحمل لأنها تؤدي إلى تحسين خواص التربة أثناء دق الركيزة.


Article
PERFORMANCE OF DRIVEN REINFORCED CONCRETE PILES UNDER THE EFFECT OF DYNAMIC LOADING

Authors: Sura Amoori Abbas --- Zainab Hassan Shakir --- Mohammed Yousif Fattah
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2019 Volume: 23 Issue: 1 Pages: 117-134
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Dynamic analysis for reinforced concrete precast piles with (300x300 mm) in dimension and length (12 m) with different types of loading was carried out. The common precast pile in Iraq was adopted in this study. Finite element analysis by ANSYS software was adopted and dynamic loading was applied to check out the strength and performance of pile. The frequency range adopted is based on the low, medium and high frequency. The analysis consisted of single pile (without surrounding soil) and pile embedded in soil as nonlinear material (soil) analysis to evaluate the vertical and horizontal displacements at the location of applied load. According to the analysis of single pile without soil and when the model of pile embedded in the soil indicated that the soil – structure interaction represented the worst case that is mean the simulation of the pile must take into account the effects of soil on the behavior and performance of the precast pile. The applied static loading on the pile model and checking the results of pile strength capacity showed that the applied load equal to the value calculated as per ACI 543R-2000 suggested equation. Based on the finite elements analysis results in case of friction between the contact surface of soil and pile increased the strength capacity of the pile due to the forces developed along the pile so that these forces add to the bearing resistance of the pile. The displacements in case of low and medium frequency are tenth time more in case of soil-structure interaction as compared with the analysis results of single pile alone. It was concluded that the presence of friction between the contact surface of soil and pile increased the strength capacity of the pile due to the forces developed along the pile so that these forces add to the bearing resistance of the pile.

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