Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userRealistic models of the forms of deformation and collapse in concrete road bridges caused by blast load
نماذج واقعية لأشكال التشوهات و الانهيارات في الجسور البيتونية الطرقية الناجمة عن أحمال الانفجارات
1001
0 44
0
(
0
)
Authors
زكائي طريفي( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
تؤدي حمولة الانفجار إلى إفراغ كمية كبيرة من الطاقة بسرعة عالية و ذلك خلال أجزاء من الثانية مسببة ارتفاع كبير للضغط، إضافة لتولد حرارة مرتفعة، بسبب سرعة التأثير الفائقة غالبا تنتهي التأثيرات المحلية للانفجار قبل أن يبدأ الجسر بالاستجابة مما يسبب أضرار كبيرة في منشأة الجسر. لاتأخذ بعين الاعتبار معظم كودات تصميم الجسور خلال عملية التصميم أحمال الانفجارات بعين الاعتبار، و كذلك لا توجد كودات بشأن معاينة الجسور بتأثير أحمال الانفجارات، يهدف البحث لدراسة و تسهيل فهم الأضرار الناجمة عن أحمال الانفجارات على العناصر الإنشائية المشكلة للجسور الطرقية و ذلك من خلال وقائع الانفجارات و الصور الفوتوغرافية لحالات الأضرار الحاصلة عمليا و واقعيا، و أيضا من خلال بعض النماذج الحاسوبية . تم في البحث استعراض أثر حمولة الانفجار على بلاطات الجسور و تم التمييز بين حالة تأثير حمولة الانفجار أعلى و أسفل بلاطة الجسر، حيث أن حالة التفجير أعلى بلاطة الجسر تؤدي لزيادة العزوم و قوى القص في البلاطة على عكس حالة التفجير أسفل بلاطة الجسر و التي تؤدي لتأثير حمولة معاكسة للأحمال التصميمية. يتطرق البحث لأثر حمولة الانفجار على جوائز الجسور و وضحت قوى المقطع الإضافية الناجمة عن ذلك. وضحت أيضا أثر حمولة الانفجار على ركائز الجسور الطرفية و الوسطية و أشكال الأضرار الناجمة عن ذلك.
Blast load caused emptying a large amount of energy very quickly parts of the second causing a significant increase of pressure, in addition to generating high temperatures because of the high speed often ends local effects of the explosion before the bridge begins to respond, which causing major damage in the bridge. Most of bridge design codes didn’t take in account during design the blast load, as well there are no codes inspection on bridges the blast load. The research aims to study and to facilitate the understanding of damages caused by explosion load on elements of road bridges through the facts of explosion and photographs the cases of damages occurring practical and realistic, and also through some computer models.It has been in the research review the impact of the blast load on the slab bridges. The distinction between the case of the impact of the blast load at top and bottom of slab bridge. So the case of the bombing at the top slab bridge leading to increase the binding moments and shear forces, in against the case of blasting at the bottom of slab bridges leads to act opposite load for design loads. Also studied blast load on bridge beams and illustrated resulting addional cross sections. Also explained the effect of blast load on bridge piers and abutments, and the forms of caused damages.
References used
BANGASH, M.Y.H., BANGASH, T. : Explosion Resistant Buildings.- Springer Verlag Berlin Heidelberg, ISBN 10 3-540-20618-3,PP.784, 2006
VARGHASE, BINOL., AJITH, M S.: Blast Load Generation Methods on Bridges .- In: International Journal of Structural and Civil Engineering Research, Volume 3, No. 3, PP 36-47, 2014
A.K.M. ANWARUL ISLAM : Performance of AASHTO Girder BridgesunderBlast Loading.- Dissertation atFAMU-FSU COLLEGE OF ENGINEERING, Florida State University,PP 178, 2005
rate research
Read More
This researchdeals with the topic of controlling the cost of concrete bridge projects in
the early design phase. The research aims at using cost controlling as an auxiliary tool for
designing and decision making.Cost control methodology has been pr
oposed based on
modeling the elements of structure, and proposing a method forcost estimate. This method
based on estimating of quantitiesfrom the general parameters of the structure and prices are
being updated periodically.The proposed methodology studiesmany available alternatives
that werechosen by the designer andevaluate thesealternativeseconomically.
The study aimed to clarify the economic concept to the problem of environmental
pollution and the economic effects of him. How is the confrontation of this economic problem
through the following steps:
1- Quantification of environmental pollution
(air quality monitoring in the
surrounding medium).
2- Quantification of the results of environmental pollution (the negative impact on
health and property due to air pollution , and loss of agricultural and animal wealth .
3- Estimate of the results of environmental pollution ( the cost of treatment and
alternative employment opportunities , loss of GDP as a result of the inability to work due to
illness or disability or early death , property damage costs in agricultural and animal wealth ,
the cost of damage in the aesthetic value .
The study concluded that a range of results, including :
Monitoring and Pollution reality in Banias , and then compare the average cost
incurred by the population as a result of ( health damage , property damage, damage in
agricultural and animal wealth ).
Determination of environmental costs through the expense of a decline in the quality of
people's lives and the deterioration of the quality of the environment , such as exposure to
diseases caused by environmental pollution and the cost of treating these diseases physically
and years of work and life that are lost due to disease , in addition to the loss of the value of
environmental services and resources, especially non-renewable ones, as well as the loss
opportunities and environmental features such as the aesthetic standards of the tourist areas .
The study recommended that the industrial strategies in Syria adopt Sustainable
Industrial Development Policy, which include an integrated and comprehensive environmental
dimension in the administration of any industrial development project .
This is in line with the concept of sustainable development, which calls for enterprises of
different types to preserve the assets and resources of the community of human, material and
environmental which is considered the property of the current and future generations.
Bituminous pavement is the most prevalent type of road construction in the Syrian Arab Republic and is widely used in all regions of the world. The proportion of roads that depend on this type of pavement is about 93% in the United States of America due to the ease and speed of its construction and maintenance.
The study
will examine the effect of changing the diameter of the longitudinal
and lateral reinforcement on the carrying capacity of the concrete
columns and compare the value of the compressive strength of
concrete, which is associated with the theoretical relations provided
by (Mander), (Park et all) by building an analytical model using
finite element Program ANSYS.
Counterfactuals are a valuable means for understanding decisions made by ML systems. However, the counterfactuals generated by the methods currently available for natural language text are either unrealistic or introduce imperceptible changes. We pro
pose CounterfactualGAN: a method that combines a conditional GAN and the embeddings of a pretrained BERT encoder to model-agnostically generate realistic natural language text counterfactuals for explaining regression and classification tasks. Experimental results show that our method produces perceptibly distinguishable counterfactuals, while outperforming four baseline methods on fidelity and human judgments of naturalness, across multiple datasets and multiple predictive models.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
