توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Dynamic Stress analysis in a Gas Pipeline model with a bend (Elbow)
نویسنده(ها): ، ، ،
اطلاعات انتشار: نخستین همایش ملی و بین المللی مدیریت بحران در خطوط لوله و تاسیسات، سال
تعداد صفحات: ۹
In the world today, the gas pipelines systems to sustain the desired level of human life are essential. Introduction of these systems as vital artery indicates its importance in maintaining the public health and safety. If the gas pipelines, particularly joints of bend and their curves damage in an earthquake, loss of services and products is inevitable. The possibility of such damage to the staff of the relevant installation, environment and the public is directly hazardous, as well. So, in this paper, an intra–city gas pipeline with bend (elbow) has been modeled through Ansys software and review and analyze of the dynamic stress in it by earthquake acceleration records of Naghan and a verity of various factors are paid. The results achieved through this paper are those of the greatest stresses occur in elbow points and the area around it. So, these areas are the most vulnerable parts of the pipelines so that special arrangements should be considered in dealing with earthquake<\div>

۲Effects of Using Silica Fume (SF) in Improving Permeability Properties of Self–Compacting Concrete (SCC
نویسنده(ها): ، ، ،
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۷
Self compacting concrete (SCC) is a highly workable concrete characterized by extreme fluidity that can flow through heavy reinforced and complex structural elements under its own weight and without any vibration.The literature indicates that while many research are available on mechanical property of SCC there are a few studies on durability property of SCC like permeability. Permeability leads to moisture and destructive ions penetration and, thereby, to corrosion of the embedded reinforcement in concrete members. Silica Fume (SF) is an additive material which can improve permeability of concrete. The amount of added SF gives high strength and chemical resistance of concrete .In this research SF is recognized as an accepted concrete additive and the effects of this material on permeability and strength of SCC is comparing with usual SCC samples. Finally best replacement percentage of SF is estimated to achieve best permeability position with the same water to cement ratio<\div>
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