Sandwich panels are locally produced with two faces of metal those which cover a
hard adhesive and thick core of polyurethane. The widely Extend of these panels increase
day for day as structural elements imitating the function necessities of the e
ngineering
construction.
The use of those panels as carried structural elements in wall or ceiling structures can
coincide with a submission of their sections materials, especially the two faces to the
change in a nature of the normal stress acted on them due to the alternate of the panel part
bending statically or dynamically when the alternate was produced from the change of
the loading acting direct on it or from the alternate of the live loading on the adjacent fields
of the continuous systems from it.
The evaluation of the sustain capacity and stability of the sandwich elements
consisted of such panels performs depended to the critical stress value leaded to arise of the
wrinkling waves of the compressive face of the panel that it values depended first on the
quality and properties of the production.
The research handled the testing of the sustainability and stability of the local
produced sandwich panel due to the alternate in a nature of it stress statically as a carried
structural element in the structural system built from such panels.
The conclusions of the research showed that this produced panel
follows a linear behavior too even in the case of the change of its bending direction or stress
nature of its face, especially in the loading steps coincided at least to the arising of the critical
wrinkling stress, whereas the value of this stress decreases 40% from its value for the
loading or bending case of the panel in only one direction.
تشكل المعالم الأثرية السورية جزء اساسيا من التراث الإنساني, ومن هنا تبرز أهمية الحفاظ على هذه المعالم وعلى الرسالة التاريخية التي تنقلها للأجيال القادمة . ويعتبر انهيار الأبنية لأسباب جيوتكنيكية من أهم أسباب انهيارات الأبنية وخاصة في حالة حدوث الهزات
الأرضية.
يهدف هذا البحث إلى دراسة السلوك الزلزالي المتبادل بين التربة وبناء واقع في قلب مدينة دمشق القديمة وهو البرج الواقع في الواجهة الشمالية لقلعة دمشق الذي يحاذيه نهر بانياس. وقد تم الأخذ بعين الاعتبار الوضع الجيولوجي والزلزالي لموقع دمشق والمواد المستخدمة في الإنشاء ومواصفاتها الفيزيائية الحالية.
وخلص البخث إلى تحديد تأثير السلوك الزلزالي للتربة على الإجهادات والانتقالات المتكونة في البناء وانعكاس وجود النهر القريب على هذا السلوك بالإضافة الى احتمالية ظهور التشققات في البناء.
This research is aimed to verify the statement of pavement structural design and construction of bituminous concrete mixture which is used on wearing layers in roads and highways in Damascus city.
It's clearly found that many of these bituminous con
crete mixtures were far - away from standards and specifications regards to flexible pavements such as aggregate gradations, Marshall Stability, bitumen content and Marshall flow. The role of highway statements authorities who deal with pavement
design and supervise the construction is quit necessity.
Finally test results of cores taken from several roads in Damascus city were analyzed and compared with the designed mix «original» test results which was done in Damascus University labs.
Evaluation of present and future traffic situation is carried out for estimating the level of service through a lot of traffic indicators (such as Saturation Flow, capacity, delay and travel time), but all these indicators are based primarily on the
measurement of Passenger Car Unit (PCU) .This paper analyzes the impacts of
four different types of vehicles on the capacity of signalized intersections. Data was collected at five intersections in Damascus city, and estimates of mean headways associated with four different types of vehicles, as well as passenger cars. Using the estimated headways, Passenger Car Equivalents (PCEs) were
calculated, and these suggest that the impacts of these types should be given special consideration when analyzing the capacity of signalized intersections.
Rock slope failures usually occur along the structural
discontinuities in rock masses, but for weathered and highly
jointed rock masses, failure surfaces are often curved as in soil
slopes.
This paper is concerned with stability analysis of weath
ered and
highly jointed rock slope using shear strength reduction technique by FLAC program, which uses finite difference method.
This paper presents a stability analysis of a rock slope in Khneifees
mines in Syrian desert, to verify that it is safe for workers and
equipments to work beside it, and manipulates the result charts
of FLAC analysis using finite difference method and shear strength
reduction technique to assess the stability of the rock slope,
determine the safety factor of the rock slope and expect failure
mechanism.
The equipment of reinforced concrete by using native materials
(cement-aggregates-steel) in ideal conditions help us producing
concrete that consummate the Syrian Arab Code conditions, but
these are not found in Engineering Structure workshop that
have
affection of characters used materials in one hand, and these
behavior in the common work with steel –Structural behavior of
Engineering member espial in serviceability stage, that may be
expose accepted limits in other hand . So it is necessary to correct
the Syrian Arab Code's formulas of deformation and finding
suitable mathematical factors and formulas that insure structural
safety for reinforced concrete members under bending moment that casted in structure workshop circumstances in Syrian Arab
Republic.
Different teaching methods make students’ educational experience hard and even frustrating. This article
suggests a framework for architectural design courses that aims to provide a general road map according
to which information is addressed in pa
rallel with theoretical information gained from other courses. It is
based on the three main issues of architectural design as defined by Vitruvius; namely, function,
structure, and form. Two other issues are also addressed: the social and the environmental side. The
framework was applied for two semesters at the International University for Science and Technology in
Damascus; open juries were also used for the first time. Results obtained from questionnaires and
interviews indicate acceptance of the proposed framework and the idea of open juries by faculty and
students. However, the application of the framework requires longer time to be fully and seriously
accepted and then adopted by faculty. Students were enthusiastic about the open jury.
A parametric study of pile load test requires a numerical modeling of this test and a study of the effect of each parameter of the material model used on pile load settlement curve shape and on the extrapolated value of pile ultimate bearing capacity
. Some real pile load tests are numerically modeled and calibrated using two types of material models: Mohr-coulomb MC and Hardening soil HS. The obtained results from HS are better than those obtained from MC, so material model HS is adopted to generate pile load settlement curves. It is shown that the relation between the extrapolated value of pile ultimate bearing capacity and each parameter of the material model used is linear, and there is only one value for each parameter of HS in which the calculated value of bearing capacity identifies with the normal value in DIN-Code. The main economic benefit obtained from this research is the ability of generating pile load settlement curves in addition to doing a parametric study using a numerical modeling method without any need to do pile load field tests. The practical scientific aim is to accumulate and collect information that can be used as a database for static pile load tests.
Because of the increasing need to improve quality in construction projects, it is necessary to reduce and prevent reworks, and that is by understanding their roots and recognizing their causes. So this research studies reworking on local projects (Sy
rian buildings) in terms of causes and classifications. Information was collected from questionnaire that identified some variables (100 variables) contributing to reworking. These variables were categorized according to seven main headings: human, coordination and communication, technical and engineering, owner, project management, contract, and design. Responses were further condensed using factor analysis to group the variables into basic factors. This study revealed that the sources of reworks included inexperienced personnel, projects executions after a long time of studying, a short period given by owner, poor total project management, inadequate study for project before bidding, and separation between design and executing. Finally, this research recommended that a total commitment to quality management policy applications would lead to a reduction in reworks on Syrian construction projects.
Al-Kabeer Al-Shemale river rises from Aqraa Mountain and coastal mountains, it is considered one of the largest rivers in the coastal area.Its catchment area is 1097 km2, and empties into the sea to the southern of Lattakia.The study aims to determin
e the impact of climate change on the river discharge. Since the rainfall is the major factor in the runoff formation in the river catchment, the rainfall changes have been studied in climatic stations located within the catchment and its surroundings, and for a period of time exceeding thirty years. The study found that the general trend of rainfall change and runoff with time is decreasing, declining rainfall values ranged in the studied stations between (0.4-12.5) mm per year, and the runoff reached 0.08m3/s in the year. A mathematical equation, predict river discharge after knowing the values of daily precipitation, has been concluded.
