Abstract The ever-growing numbers of people and vehicles seen by the Libyan cities at the present time, and the consequent increase economic and social development was held after the last incumbent to think of future supply in the system of road network in Tripoli after a decade or several decades to respond to the request and in particular the urgent need for radical solutions to all problems of congestion and bottlenecks and traffic accidents that were not the same size, severity and loss of physical and moral than ever before. This study addressed the focus of transportation planning, transport and highlighted the various stages of transport planning and reviewed the most important models used to predict the future traffic volumes, a resurgence or trip generation, trip distribution, mode of choice and traffic Assignment, where the focus of this study the first type of models which trip generation in the study area in Tripoli. And has been a review of some international studies in this area in both the United States of America, China, Korea, Iran, Nigeria, Egypt, Saudi Arabia, the focus in these studies to examine the variables affecting the creation of trips, the so-called independent variables affecting a number of family members and the number of vehicles and number of employees and income, the same factors that have been taken into account in the study area in Tripoli. Were identified the study area within the Centre for the city of Tripoli Commercial (CBD) called green belt area and specifically (range locality Martyrs coast and Aleneuvliyn), which recently experienced jams unprecedented, was the use of both methods for regression analysis to create a mathematical model is calculated both (Average trips, vehicle trips, and work trips) and Cross Classification Analysis to find work trips of the classification (number of vehicles / household size) and finding vehicle trips from category (the number of employees / income). Data were collected and information on the ground and through the questionnaire prepared by families in the region through the use of home Meetups and interviews necessary for the formation of mathematical models for the study and were compared with the results of both methods as used was to highlight the most important software modern and universally used in the travel demand. The study concluded the adoption of two models of regression to find trips generated, the first to find the average trips and the second vehicle trips The model work trips, he was excluded for being unfit, the Statistical The comparison higher efficiency of the regression model vehicle trips than cross classification analysis table to find the estimated values in generated trip, as a set of recommendations aimed at reducing the obstacles and difficulties in finding and the formation of specialized models to calculate the demand for mobility in cities of Libya
أمل فتح الله زايد (2010)

تعتبر ظاهرة تحرك الكثبان الرملية و وزحفها على الطرق الرئيسية من الظواهر الخطيرة التي تتسبب في حوادث قاتلة وعرقلة لحركة المرور، إضافة إلى الخسائر الاقتصادية الكبيرة . ومن الطرق التي تعاني مثل هذه المشاكل الطريق الرابط بين نالوت و غدامس والطريق الرابط بين الوطية و الجوش والطريق الرابط بين العزيزية و غريان وكذلك طرق الجنوب مثل طريق سبها براك وطريق سبها أوباري ... الخ ، لهذا كان من الضروري القيام بعمل دراسة ميدانية ( حقلية ) للأماكن المتضررة من الطرق وإجراء الاختبارات المعملية اللازمة واقتراح الحلول المناسبة لمعالجة هذه الظاهرة يأتي هذا البحث لدراسة ظاهرة زحف الكثبان الرملية على الطرق المتضررة من هذه الظاهرة والتي تقع في شمال وجنوب غرب ليبيا وهي طريق نالوت غدامس وطريق الجوش الوطية وطريق العزيزية غريان وطريق براك سبها ، حيث تم تحديد القطاعات المتضررة في الطرق سالفة الذكر وإجراء عملية الرفع المساحي لتلك القطاعات للتعرف على وضعية الرمال وحجمها ، حيث تم رسم قطاعات عرضية وطولية لكل القطاعات المتضررة . وكذلك إجراء اختبارات معملية للتربة المكونة لتلك الكثبان والمتمثلة في تحليل الحجم الحبيبي واختبار بركتور المعدل لمعرفة خواص التربة وتصنيفها وذلك حسب نظام تصنيف التربة الموحد ، وتحديد أقصى كثافة جافة ونسبة المياه المناظرة لها ، ونسبة الرطوبة ، كما تم دراسة تضاريس كل منطقة يقع فيها القطاع المتضرر والتعرف على مصادر المياه بها ،والظروف المناخية مثل اتجاهات الرياح السائدة وسرعتها وباستخدام النتائج المتحصل عليها والدراسات السابقة التي قامت بها العديد من الدول التي تتأثر بهذه الظاهرة والتي استعرضنا منها في هذا البحث دراسة كل من الولايات المتحدة الأمريكية والكويت والجزائر ومصر ، تم اقتراح ثلاثة حلول لعلاج هذه الظاهرة وهي مقطع الديناميكا الهوائية والذي تم تجربته في دولة الكويت ، والحل الاستثماري وهو اقتراح قام به الباحث بالرجوع إلى حجم المرور اليومي على القطاعات المتضررة ، و الاقتراح الثالث يتمثل في التثبيت البيولوجي مع مصدات الرياح لتثبيت التربة . وقد تم تحديد أفضل الحلول العلاجية لكل قطاع . Abstract The main aim of this study is to analyze and evaluate the movement and creeping of the sand dune on the main roads considered as dangerous phenomena which caused accidents and resulted in hindering traffic movement. It also caused great economical losses. The roads which suffer from this problem are Nalut - Gadams road, Al Gush – Al Wtyah road and Azizia - Garyian road. Similarly in the south of the Libya there are many roads which suffer from the movement and creeping of the sand dunes, such as Sebha - Brak road, Sebha - Obary road ....ECT. To study this problem it is very important to do a field study about roads that suffer from this problem and need laboratory tests in order to suggest suitable solutions for the treatment of this phenomenon.This study, as indicated above, analyzed and evaluated the movement and creeping of the sand dunes phenomenon in the damged roads located in North and South West of the country. These roads include Nalut-Gadams road, Al Gush-Al watyah road, Sebha-Brak road and Azizia-Gryan road.After identifying the critical section in the above mentioned roads, the researcher carried out a surveying work for sections to identify the sand passivism in relation to the damaged sections and its volume. In this regard, cross sections and longitudinal sections were drawn. Also laboratory sand tests were conducted .These tests include: Sieve Analysis Test. Modified Proctor Test.for identifying sand classifications and characteristics according to its unified system, identifying water dry density and percentage of the parallel water, percentage the humidity. In addition, a study was carried out on the topographic relief of each critical sections to identify the water sources and climatic conditions such as the speed and directions of the dominated winds.The application of the main findings of this study, and other previous studies done by some other countries influenced by this phenomenon, such as United States of America, Kuwait, Algeria and Egypt conclude to three solutions for treating this phenomenon. These solution include: 1- Aerodynamic Profile section which tested in Kuwait. 2- Investment solution which depend on the daily traffic size on the hurt sections. 3- Biological fixing with wind obstructs for fixing the sand. Finally, the best solution for each section was determined.
أبوبكر موسى محمد (2009)

Download PDF Research Article - Civil EngineeringPublished: 31 July 2019Investigation on Mode I Fracture Behavior of Hybrid Fiber-Reinforced Geopolymer CompositesNeha P. Asrani, G. Murali, […]K. Karthikeyan  Arabian Journal for Science and Engineering volume 44, pages8545–8555(2019)Cite this article 225 Accesses 4 Citations Metricsdetails Abstract Recent reports in the literature have shown that fiber-reinforced geopolymer composites (FRGC) made with monofibers exhibit a significant enhancement in fracture energy. However, many aspects of the fracture performance of hybrid fiber-reinforced geopolymer composites (HFRGC) remain largely unexploited, and these are predominant for the structures. For the first time, the mode I fracture energy of HFRGC is investigated. The mode I behavior was assessed using pre-notched beams in accordance with the RILEM three-point bending test. Five different HFRGC mixtures were prepared using three fiber types: steel, polypropylene and glass (SF, PF and GF). The parameters of the pre-notched beam in flexure tested in this study were the first crack and peak load, crack mouth opening displacement at the first crack load and peak load, equivalent tensile strength, post-peak slope, reinforcing index, residual tensile strength and fracture energy. The results reveal that there is a positive interaction amidst the fibers in geopolymer composites that leads to an enhancement in the mode I fracture energy compared to the reference specimen. This study probes the influence of novel HFRGC while producing high-quality concrete, which can then be leveraged for sustainable infrastructure and various civil engineering works. arabic 15 English 79
Hakim Salem Abdelgader Abdelgader (7-2019)