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Article
Artificial Neural Network Model for Predicting Nonlinear Response of Uniformly Loaded Fixed Plates

Authors: Ayad Amjad Abdul-Razzak --- Salim T. Yousif
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2007 Volume: 25 Issue: 3 Pages: 334-348
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

An artificial neural network (ANN) model has been developed for theprediction of nonlinear response for plates with built-in edges and differentsizes, thickness and uniform loads. The model is based on a six-layer neuralnetwork with back propagation learning algorithm. The learning data wereperformed using a nonlinear finite element program, the set of 1500x16represent the deflection response of load. Incremental stages of the nonlinearfinite element analysis was generated by using 25 schemes of built-inrectangular plates with different thickness and uniform distributed loads.The neural network model has four input nodes representing the uniformdistributed load, thickness, length of plate and length to width ratio, fourhidden layers and sixteen output nodes representing the deflection response.Regression analysis between finite element results and values predicted by theneural network model shows the least error. This approach helps in thereduction of the effort and time required determining the load-deflectionresponse of plate as the FE methods usually deal with only a single problemfor each run while ANN methods can solve simultaneously for a patch ofproblems


Article
Numerical Analysis of Controlled Modulus Column Foundation System Supported Embankments

Author: Zainab Ahmed Alkaissi
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2009 Volume: 15 Issue: 2 Pages: 3691-3709
Publisher: Baghdad University جامعة بغداد

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Abstract

The objective of this research is to present the numerical analysis of deep foundation system namely controlled modulus columns (CMC) for support of embankments. This paper describes the analysis modeling used for CMC foundation system using the finite element method. The elasto-plastic finite element model used to simulate the embankment soil foundation has been verified against field data. The results obtained from this study showed that the effect of CMC could be negligible when the soil strength increased in terms of its angle of internal friction. With low values of internal friction angle, the CMC reduce the potential of surface deformation about 12%. The values of surface deformation decreased with column diameter until it reach constant value at (0.5m) where less than this values the reduction in deformation could be negligible or have insignificant effect. The maximum deformation was observed at the middle of embankment, also the deformation at the embankment foundation reduce by about (17%) when take into consideration the CMC in soil embankment foundation.

ان الهدف من هذا البحث هو لتقديم التحليل العددي لنظام اسس التعليات الترابية المسمى (CMC)لدعم التعليات الترابية. هذا البحث يصف التمثيل التحليلي المستخدم لـ (CMC) باستخدام طريقة العناصر المحددة . ان نموذج المرونة اللدونة بطريقة العناصر المحددة استخدم لتمثيل نظام التعلية الترابية وتم مقارنتة مع نتائج حقلية. ان النتائج التي تم الحصول عليها من هذه الدراسة اظهرت ان تاثير CMC يمكن اهماله بزيادة مقاومة التربة بدلالة زاوية الاحتكاك الداخلي. ولقيم قليلة لزاوية الاحتكاك الداخلي فان CMC يقلل نسبة التشوه السطحي بحوالي 12%. ان قيم التشوه السطحي تقل مع قطر العمود حتى يصل الي قيمة ثابتة حوالي(0.5 m) حيث ان اقل من هذه القيمة يمكن اهمال النقضان الحاصل بالتشوه او يصبح تاثيره غير ملحوظ. واعلى قيمة للتشوه لوحظت تحت منتصف التعلية, كذلك ان التشوه في اساس التعلية يقل بحوالي (17%) عند الاخذ بنظر الاعتبار الـ (CMC) في اساس التعلية الترابية.

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