http://blogs.najah.edu/author/emp-2302 An-Najah Blogs :: Civil Engineering Department Head en-us Thu, 18 Apr 2024 10:29:22 IDT Thu, 18 Apr 2024 10:29:22 IDT [email protected] [email protected] http://blogs.najah.edu/staff/emp-2302/article/Simplified-Analysis-and-Design-of-Bored-Cast-in-situ-Reinforced-Concrete-Cantilever-Sheet-Pile-Walls-in-Clayey-SoilsPublished ArticlesMany excavation support systems are available bored cast in-situ reinforced concrete cantilever sheet pile wall is the support system under consideration in this paper There is no specific design and analysis procedure for such excavation support system and most designers rely on experience rather than on engineering methods The aim of this paper is to present a simplified analysis and design method to the proposed excavation support system in clayey soil which will provide valuable design parameters such as penetration depth of the sheet pile maximum bending moment and shear force and maximum deflection at the top of the cantilever sheet pile for various arrangements of bored piles that form sheet pilinghttp://blogs.najah.edu/staff/emp-2302/article/articlePublished Articlesإن الخرائط الجيوتقنية والتي تعتبر مكملة للخرائط الجيولوجية، يمكن أن تكون بديلاً عنها في الاستخدامات الهندسية، وهي الآن شائعة الانتشار والاستخدام، وخصوصا مع انتشار نظم التوقيع الكوني Global Position Systems GPS ونظم المعلومات الجيوغرافية Geographical Information Systems GIS وتقدم هذه الخرائط لكثير من الدراسات التمثل الأفضل، وذلك بعرض المعلومات بصريا، حيث توفر الكثير من الجهد والوقت، وتقدم بسرعة متناهية المعلومات الضرورية للمشاريع الهندسية المختلفة، وخصوصا في مجال الهندسة المدنية مثل: إنشاء البنايات والسدود، وشق الطرق والأنفاق، واستخدام الأراضي، والبحث عن المياه الجوفية وغيرها وهناك أنواع متعددة من الخرائط الجيوتقنية، أما الخريطة الجيوتقنية المقترحة في هذا البحث فهي خريطة توضح تصنيف تربة التأسيس ومقدار تحملها ونوع الأساسات المقترحة لمدينة نابلس - فلسطين وتكمن أهمية هذه الخريطة الجيوتقنية المقترحة -في هذا البحث- في سهولة وسرعة تقديمها للمعلومات بخصوص الأساسات بشكل عام، ونوع الأساسات المقترحة بشكل خاص، ومقدار تحمل التربة، والمشاكل التي يمكن توقعها في تربة الموقع، مثل: الإنزلاقات والانتفاخ والهبوط ووجود المغر الكهوف ووجود المياه الجوفية إن هذه المعلومات تساعد كذلك- في الدراسات والتخطيط الأولي، ودراسات الجدوى الاقتصادية للأرض، وسياسة استخدام الأراضي مجلة جامعة النجاح للأبحاث - العلوم الطبيعية أ ISSN: 1727-2114 المجلد 21 ، 2007 ، الصفحات: 201-219http://blogs.najah.edu/staff/emp-2302/article/Assessment-of-Local-Excavation-Support-Systems-A-Case-Study-ofPublished Articles Excavations of soil and rock are one of the most important elements in laying the subsurface structures These excavations usually require excavation support systems that have fundamental influence on the safety profitability speed and quality of construction projects Despite the great importance of the support systems most designers and contractors know very little about their design and construction and they rely heavily on experience The goal of this paper is to present a review of excavation support systems available worldwide and to survey the current state of practice in the local area Nablus - Palestine including available types reasons for failure and methods of design and construction of excavation support systems This paper also suggested new techniques that may be adopted locally as an excavation support system Conclusions of this study are presented and recommendations are suggested to identify what research and development should be carried out to improve the process of design and construction of excavation support systems http://blogs.najah.edu/staff/emp-2302/article/Evaluation-of-Ground-Response-Due-to-Earthquakes-Case-StudyPublished ArticlesTwo methods are usually available for designing structures subjected to seismic loads They are equivalent static load method and dynamic analysis method The dynamic method of analysis is not widely used but it may be necessary for important structures Dynamic analysis usually has three phases defining the expected source of earthquake evaluating ground surface response spectra taking into account local soil properties and applying response spectra to proposed structure to evaluate seismic forces In this study the first two phases are discussed The recent methods in evaluating the ground response that take into account soil properties are presented This includes sources of earthquakes in Palestine and their characteristics such as earthquake magnitude predominant period maximum acceleration and duration Furthermore this study presents a case study for evaluating ground response spectra using computer program called Shake that may be used to evaluate ground response in Palestinehttp://blogs.najah.edu/staff/emp-2302/article/LANDSLIDES-IN-THE-WHITE-MOUNTAIN-GEOTECHNICAL-STUDIES-AND-ENGINEERING-TESTSPublished Articles Abstract: The White Mountain area in the city of Nablus Palestine had severe landslides in the year 1997 Necessary studies to find out the causes and to overcome this problem were carried out This included surveying of the area geotechnical studies digging out five boreholes taking necessary samples and conducting laboratory tests and slope stability analysis The factor of safety was found to be more than one between 14 and 18 and this indicated factors other than the natural slope caused the sliding in the White Mountain It was found that the main causes of landslides were the cuts in the lower part of the area After the causes for http://blogs.najah.edu/staff/emp-2302/article/Cap-Model-and-Finite-Element-Applications-For-Modeling-Geological-MaterialsPublished ArticlesImpact problems in geotechnical engineering typically encountered by the Defense Nuclear Agency DNA can be modeled by DYNA the general purpose finite element codes of Lawrence Livermore National Laboratory LLNL The DYNA cap model is one of the geological material models in DYNA codes This cap model is based on classical incremental theory of work hardening plasticity It was developed as part of a constitutive model to control the excessive dilation that is predicted by the earlier elastic perfectly-plastic models Several versions of cap model have been successfully developed with a number of features which can be included or excluded in specific problems However the DYNA cap model has deficiencies and can give deceptive results Fixing or replacing the DYNA cap model was the main objective of this study In this study a modified cap model with new features such as Koiters generalized flow rule Kuhn-Tucker optimization conditions and recent developments in return mapping alogotithms was developed It is based mainly on Hofstetter Simo and Taylors 1993 cap model A subroutine containing the modified cap model was written that can fit the general purpose finite element code DYNA-3D Furthermore two applications were carried out to check the applicability of the modified cap mode and compare it to the existing one in DYNA-3D In the first application uniaxial strain tests were simulated using the Material Model Driver of DYNS-3D In the second application the results of finite element analysis were compared with laboratory experiments of a free-falling weight penetrating a soil specimen in a confined model Two results wee compared; the maximum penetration depth caused by the falling weight and the deceleration of the falling weight while penetrating the soil When compared with the existing model the modified cap model is shown to be faster requires less computer time is simple and easy to follow from programming point of view contains new features and predicts heave which the existing cap model could not do In general the modified cap model is shown to be an improvement over the existing model Some of the bugs in the general purpose finite element code DANA-3D are described However more detailed and various laboratory andor field applications may be requiredhttp://blogs.najah.edu/staff/emp-2302/article/FINITE-ELEMENT-ANALYSIS-FOR-A-PRELIMINARY-STUDY-OF-BASP-BRIDGE-APPROACH-SUPPORT-PILING-SYSTEM-Published ArticlesThe deformation incompatibility of pile bridge structures and embankment foundations on soft soils has posed problems for highway designers for some time The traditional preloading and sand drain solutions for those particular sites may be inappropriate and an innovative system called BASP Bridge Approach Support Piling system has been developed This dissertation is a preliminary study of the behavior of the BASP system using finite element analysis program FELSTA Finite Element STructural Analysis