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Register a new userThe effect of seismic pounding on the buildings in different geometric and dynamic properties
تأثير الصدم الزلزالي على الأبنية مختلفة الخصائص الهندسية و الديناميكية
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إن ظاهرة الصدم من أهم أسباب انهيار المباني أثناء الزلازل لذا تلجأ معظم الكودات لتجنب حدوثها بزيادة المسافة بين الأبنية المتجاورة، و من جهة أخرى فالتكلفة المرتفعة للأراضي تفرض علينا الاستفادة من أكبر مساحة ممكنة بالإضافة لصعوبة معالجة الفاصل معمارياً خاصةً بالنسبة للأبنية العالية فقد يصل عرض الفاصل إلى 50cm . تمت في هذا البحث مناقشة موضوع الصدم الزلزالي و البحث في آلية نمذجته و الطريقة الأنسب لدراسته بالاعتماد على برنامج التحميل الديناميكي(11 Ansys Autodyn Ver) فاختيرت لدراسته عدة حالات من نماذج ثلاثية الأبعاد لتغطية معظم متغيرات الدراسة التي تؤثر على هذه الظاهرة و أجرينا تحميلاً ديناميكياً لا خطياً لكافة الحالات و لتابع تسارع معرف بمعادلة تتغير ثوابتها مع معالجة بيانات السجلات الزلزالية. و تمت مناقشة النتائج بعد دراسة الانتقالات و الإجهادات و التشوهات و العوامل المؤثرة عليه .
The phenomenon of impact between the adjacent buildings is one of the most important reasons for collapse of buildings during the earthquakes for that most of the codes resort to avoid impact by increasing the distance between adjacent buildings, but on the other hand high cost of land requires us to take advantage of the largest possible area in addition to the difficulty of making the separation architecturally and in particularly for high buildings the separation may offer up to 50 cm. We tried to have this research one of the studies that discuss the subject of seismic pounding where we discussed the methods for modeling the pounding and the most appropriate way to study the impact depending on the program dynamic analysis Ansys (Autodyn Ver. 11) then chose several cases for study seismic impact in three-dimensional models to cover most of the study variables that may affect this phenomenon, and we doer non- linear dynamic analysis for all cases, with applying acceleration function is defined by equation its constants are changing with processing the seismic records data. After finishing the analysis for all the models we have discussed changing the transitions and stresses and strains , and studied the factors affecting the impact , and discussed results of study and then we have summarizes the recommendations in that we see fit through this search.
References used
RIEDEL W. 2000. "Beton unter dynamischen Lasten..." Phd Thesis. EMI. Freiburg Germany. P1200
KASAL, JAGIASI, (1996) ." Maison Survey And Analysis Of Building Pounding During 1989 Loma Prieta Earthquake Elsevier Science Ltd". P 2103
AUTODYN VER.11.2000. "finite element analyses and Dynamic Analysis and Design of Three-Dimensional Structures" . P788
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A proper matching of agricultural machinery with properties of materials forms the
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To achieve that goal, availability of data and precision analysis on engineering and
physical prop
erties of these materials is required. This forms important and necessary data
base for the design, development and structure of agricultural machinery and equipments,
control and analysis of machines and determination of efficiency of machines.
This research was carried out to study some engineering and physical properties of seeds of
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machinery and equipments.
Results provided the shapes and dimensions of cells of feeding devices for planting seeds
of some crops namely, wheat, maize, lentil, pea, chick-pea, kidney bean, broad bean and
cotton.
In addition a set of empirical equations were established to be used to predict, with
reasonable accuracy, the physical properties of crops seeds based on measurement of any
of three dimensions (length, width and thickness).
الخواص الهندسية للبذور
الخواص الفيزيائية للبذور
أبعاد البذور
جهاز التلقيم
خلايا التلقيم
جهاز التلقيم ذو الأسطوانة المموجة
آلة البذار
آلة التسطير
Engineering Physical properties of seeds
Physical properties of seeds
Dimensions of seeds
Feeding device
Cells of feeding
Fluted forced feed
Planter
Grain drill
المزيد..
In this research, a study of full tank case is carried out. The water
contained in the tank was modeled as two masses following the
recommendations of Eurocode.
Taght find differing formulas and buildings simslar in the words of the Koran within the context compares names and names in terms of definition and saying that the indefinite , and plural forms , and between the acts and deeds ; the expression of th
e past and the present tense , and the construction of the known and the construction of the unknown , and the names and deeds ; the expression palmdhara and the actor's ma,e , and source and the source , deals with the meanings and uses nuances according to the required linguisric context , and the context of the case , and trying to analyze those formulas and structures analysis linguistically accurate up to eventually secures or end semantic of isomorphism those words and similarity .
And display search the views of scientists from linguists and dropped by the interpreters and Blagaan between the different destinations , opinions and attitudes between similar to those formulas and buildings and similarity , or different and contrast , all within the quranic installation and linguistic jewelers , and appropriate , and the article
And ends with a conclusion find the findings of the research involved .
The behavior of the basaltic shear diaphragms of the remaining buildings of ancient times
was investigated as experimental research,and its resistance to natural factors and
horizontal loads resulting from wind and earthquakes,to take advantage of
them in the
maintenance of modern buildings,which are associated with floors and beams as horizontal
shear diaphragmsIn the hot and cold areas of the African continent, Asia and other similar
areas,to replace the reinforced concrete shear diaphragms,and metal shear diaphragms that
lose their resistance to the above factors. When the buildings are inspected, the vertical and
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cracks related to the hardness of the shear diaphragm section, the basalt stone
specifications and the design of the shear diaphragm base.The research was conducted
to determine the durability, water permeability and resistance to pressure and tensile
strength of basalt stone samples used in historic stone buildings and their location in
laboratory methods.Horizontal loads resulting from seismic intensity were determined on
the front of the building at the tile level according to international requirements and
specifications.The method of calculating the basaltic shear diaphragms was
applied by applying arithmetic to build a basalt stone from several floors and a basement,
taking into account the characteristic resistance of basalt, depending on its density from
pressure and stretching and basalt stone in calculating.
The experiment carried out in the agricultural Center (Boqa) of Tishreen University,
in the province of Lattakia, during the agricultural season (2014), in order to study the
effect of different types (cattle, sheep, poultry) and rates (0, 15.30 to
n/ha) of the compost
on durum wheat (Doma1). It farmed on (11.23.2014), according to complete system of
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(10/06/2014). The results showed a response to the average of all the studied traits (plant
density (plant/m2), plant height (cm), the length of awn (cm), grains/spike weight (g), the
weight of 1000 grains (g)) positively organic fertilizing. While no significant differences
were recorded in the averages of the traits studied (plant density (plant/m2), plant height
(cm), the length of awn (cm), grains/spike weight (g), 1000 grains weight (g)) under the
manure type. In the case of overlap between the type and the rate of organic manure, it has
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ton/ha-1 poultry) was the most influential of all the studied traits. It gave the following
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cm), grains/spike weight (1.66 g), 1000 grains weight (49.57 g).
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