توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Investigation of seismic performances of bridges
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس ملی زیر ساختهای حمل و نقل، سال
تعداد صفحات: ۸
Lifeline systems consist of Bridges, Roads, Tunnels, Communication networks, Water and Gas Transmissions, Airports,etc, are known as a general parameter for all cities especially Megacities survival. Any trouble in their operation particularly intimes of crisis (earthquake, flood, tempest, war, etc) will increase irreparable losses of life and property. Large lifeline systems suchas bridges are susceptible to earthquake damages, and their performance, integrity and stability according to their specialapplication in current–day transportation, during and after an earthquake have significant implications on public safety. Bridgesare one of the most importance lines to control rescue operations during and after earthquake. So, there is an urgent need torecognition the effective factors on bridge damages in an unforeseen exigency. Hence, their vulnerability significantly should beunder continual surveillance and bridges stability has to be controlled by retrofitting and rehabilitating. In this study the seismicperformance of various types of bridges during the past earthquakes is presented. The objective of this study is to present typicalfailure modes of bridges and providing some clues in order to reduce the seismic vulnerability of such structures. Results of thisstudy demonstrated that there are some typical failure modes in bridges. Hence, by considering some special practicalconsideration the seismic vulnerability of bridges may decrease.<\div>

۲Sliding and Overturning Safety Factors of Concrete Gravity Dam under the Influence of Drainage Specifications
نویسنده(ها): ،
اطلاعات انتشار: چهاردهمین کنفرانس ملی هیدرولیک ایران، سال
تعداد صفحات: ۷
Ensuring of the proper functioning of concrete dams is one of the most challenging issues of today's engineering world. A concrete gravity dam is facing with a variety of failure mechanisms include dam sliding on the structure and foundation interaction surface and overturning. Two mentioned mechanisms are discussed in this study. Sliding and overturning safety factors are calculated for Shafarud dam with a height of 150 meters, under construction, placed in Gilan, north of Iran. Loads are include hydrostatic force, hydrodynamic and earthquake. Also the effect of various parameters on the safety factors such as drainage performance coefficient, drainage location and reservoir water level will be discussed. The results in general show very good performance and achieving high safety factor for the dam. But in the case of full reservoir slide–resistant was inadequate in some cases.<\div>
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