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Article
Numerical Simulation of the Infinite Medium of Dry Soil in Dynamic Soil-Structure Interaction Problems
التمثيل العددي للمجال أللانهائي للتربة الجافة في مسائل ديناميك التأثير المتبادل بين التربة والمنشأ

Author: Saad Faik Abbas Al-Wakel
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 8 Part (A) Engineering Pages: 1447-1458
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

One of the major issues in the dynamic analysis of soil-structure interaction problems is to model the far field medium. The dynamic analysis of soil-structure interaction problems can be carried out by using a numerical solution procedure such as finite element method. For domains of infinite extension of the soil, using of the standard finite elements method leads to spurious reflections for waves on the artificial boundaries which can seriously affect the results.This research presents a method based on the mathematical representation of wave propagation to analyze the problems in dynamic soil-structure interaction. In this method, the infinite medium (unbounded domain) of the soil is represented by viscous elements to simulate the radiation damping in the soil. In addition, the material damping of soil is represented by Rayleigh damping and implemented in the bounded domain.The results obtained from this study indicated that, dissipation in the energy of wave occur due to representing of the infinite medium of the soil by viscous elements and Rayleigh damping. By comparing the results with those obtained from the boundary elements method to simulate the infinite extension of the soil which is proposed by Estorff and Kausel (1989), a good agreement is achieved. In addition, the dynamic response at any depth under the foundation can be estimated by using the present method.

الخلاصةأن إحدى القضايا الرئيسيةِ في التحليل الديناميكي لمسائل التأثير المتبادل بين التربة والمنشأ أن تمثل مجال التربة البعيدِ. أن التحليل الديناميكي لمسائل التأثير المتبادل بين التربة والمنشأ يمكن ان يجرى بأستخدام أسلوب ألحل العددي مثل طريقة العناصر المحددة. للمجالات ذات الامتداد اللانهائي للتربة فأن إستعمال طريقةِ العناصرِ المحدودةِ القياسيةِ يُؤدّي إلى الإنعكاساتِ المزوّرةِ للموجاتِ على الحدودِ الإصطناعيةِ التي يُمْكِنُ أَنْ تُؤثّرَ على النَتائِجِ بجدية. هذا البحثِ يُقدّمُ طريقة مستندة على التمثيلِ الرياضيِ لأنتشار الموجةِ لتحليل مسائل التأثير المتبادل بين التربة والمنشأ. في هذه الطريقةِ، الوسط اللانهائي (المجال غير المحدود) للتربةِ مُمَثَّلُ بالعناصرِ اللزجةِ والتي تحاكي تَثْبيط الإشعاعِ في التربةِ. بالإضافة الى ذلك، فأن التَثْبيط المادي للتربةِ تم تمثيله بأخماد رالي وطبّقَ في المجالِ المحدودِ.أن النتائج التي تم الحصول عليها من هذه الدراسة تشير الى حدوث تبدد في طاقة الموجة نتيجة تمثيل الوسط اللانهائي للتربة بالعناصر اللزجة وأخماد رالي. وبمقارنة هذه النتائج مع تلك التي نم الحصول عليها من طريقة عناصر الحدود لمحاكاة الأمتداد اللانهائي للتربة ألمقترحة من قبل الباحثين أستورف وكاوسل في عام 1989 نجد توافق جيد في النتائج. بالأضافة الى ذلك فأن الاستجابة الدديناميكية على أي عمق تحت قاعدة الأساس يمكن ايجاده بأستخدام الطريقة الحالية.


Article
Lateral Seismic Response of Building Frames Under the Influence of Soil–Structure Interaction
الاستجابة الزلزالية الجانبية للابنية تحت تاتير تفاعل التربة

Authors: Mohammed Ahmed Elaiwi --- Ghzwan Ghanim Jumah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 3 Part (A) Engineering Pages: 567-577
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This study deal with the elastic and inelastic structural responses of building frames under the influence of soil–structure interaction. Three give the types of moment-resisting building frames, including 5 storey, 10-storey and 15-storey buildings are selected. In addition, three soil types with the shear wave velocities less than 600m/s, representing soil classes Ce, De and Ee according to IBC-2006(3) , having three bedrock depths of 10m, 20m and 30m are adopted. The structural sections are designed after conducting nonlinear time history analysis, on the basis of both elastic method and inelastic procedure considering elastic-perfectly plastic behavior of structural elements. The frame sections are modeled and analyzed, employing finite difference method adopting ANSYS software under two different boundary conditions: (a) fixed base (no soil–structure interaction) and (b) considering soil–structure interaction. Fully nonlinear dynamic analyses under the influence of different earthquake records are conducted. The results in terms of the maximum lateral displacements and base shears for the above mentioned boundary conditions for both elastic and inelastic behaviors of the structural models are obtained and compared, with the results. A comprehensive empirical relationship is proposed to determine the lateral displacements of the moment-resisting building frames under earthquake and the influence of soil– structure interaction.

في هذة الدراسة تم دراسة الاستجابة المرنة و الغير مرنة تحت تأثير التربة لثلاث انواع من الابنية (5, 10, 15) متر مع استعمال ثلاث انواع من التربة حسب .IBS (2005) تم استخدام برنامج الانسس لتحليل الابنية باستخدام طريقة nonlinear time history analysis و اعتبار الاساس ثابت . و تم التحليل الدانميكي لهزات ارضية مختلفة و تم التحليل بالسلوك المرن و الامرنو المقارنة بين كل هذة المتغيراتون حيث التاثير الجانبي و قوى القص و لبعزوم المتولدةو تاثير التربة عليها.


Article
Nonlinear Static and Dynamic Analysis of Buildings Considering Soil Structure Interaction

Authors: Ola A. Hussein --- Mohammed J. Hamood --- Ahamed F. Khadum
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 9 Part (A) Engineering Pages: 1755-1766
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

An attempt has been made during the present study to understand the behavior of reinforced concrete structures considering soil structure interaction. A multistoried frame building subjected to seismic forces are modeled and analyzed through the finite elements software program (SAP 2000 V14) which are primarily designed according to ACI 318M-11) and ASCE 7-10 Code. Both static and dynamic analysis methods are used, which may be linear and nonlinear. Recorded ground motions are used in nonlinear dynamic (time history) analysis. Analyses of frames are carried out to find the lateral displacements, drift ratios, and time period of free vibration motion of structural systems. The study reveals that soil flexibility has significant effect on the response of structures. Soil flexibility led to increase the storey drift and lateral displacement. In addition, it led to increase in neutral lateral time period of structure vibration of frame buildings especially, with soft soil stiffness. The present study also, presents a methodology to protect the structure against earthquake excitation by using rubber isolators, where decreases in the natural frequency of structure building have been observed and the presence of rubber at a location of each column led to decrease the value of axial force and shear base stress as compared with fixed-base case.


Article
Effect of Soil –Structure Interaction on Seismic Evaluation of Existing Building Frames Resting on Raft Foundation

Author: Husain Khalaf Jarallah
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2015 Volume: 15 Issue: 1 Pages: 75-85
Publisher: Basrah University جامعة البصرة

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Abstract

The objective of the present paper is to evaluate the effects of the soil-structure interaction on the seismic evaluation in the building when a framed building is supported on raft foundation. Also the foundation-soil interaction effect has been considered by replacing it with equivalent springs. Nonlinear static pushover analyses of eight-storey reinforced concrete hospital building located at Delhi-India has been performed using the Capacity Spectrum Method of ATC-40. The deformations define the state of damage in the structure through three limit states of the NEHRP Guidelines and the FEMA-356 have been used to evaluate the performance level of the building for drift, the plastic hinge stage of the crack and shear under the condition of the fixed base and the effect of the soil-structure interaction. The performance of the building and individual components has been estimated for Design Basis Earthquake and Maximum Considered Earthquake. The weight of the slab was distributed as triangular and trapezoidal loads to the surrounding beams as per IS 456:2000. The weight of the brick masonry was distributed uniformly on the beams. The results show that the soil structure interaction has marked effect on the roof displacement, storey drift, design base shear, effective damping and crack pattern for beams and columns while there is a minor effect on the torsional behavior of the building. The building is more critical in the performance level when considering the soil flexibility.

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