توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱The study of modeling parameters effect on base shear functions and overturning moment on a fixed offshore platform in fatigue analysis
اطلاعات انتشار: چهارمین کنفرانس بین المللی مقاوم سازی، سال
تعداد صفحات: ۱۰
سازه هایی که تحت اثربارهای دینامیکی و بلندمدت دائمی قراردارند بایستی درهنگام تحلیل و طراحی آنها خرابی ناشی ازخستگی دراین سازه ها کنترل گردد بطور کلی می توان گفت براثر تکرار تنش ترکهایی که بین کریستالهای مصالح وجود دارند رشد کرده و نهایتا به یکدیگر رسیده و یا بهم پیوستن آنها پدیده خرابی خستگی ایجاد میشود خرابی ناشی ازخستگی به علت تکرار است که ممکن است این بار: با دامنه زیاد و تعداد وقوع کم باشد با دامنه کم و تعداد وقوع زیاد باشد که هردو آنها میتوانند منجر به بروز پدیده خستگی درسازه شوند دربحث خستگی دو پارامتر مهم و تاثیر گذارند که عبارتنداز دامنه تنش ها : که متاثر ازدامنه بارگذاری و هندسه سازه است تعداد وقوع تنش: که به بارگذاری سازه مرتبط است بطور مثال تعداد عبور وسیله نقلیه یا موج وارد به سازه

۲Seismic behavior of Double Concave Friction Pendulum bearings and Double Variable Frequency Pendulum isolator
اطلاعات انتشار: کنفرانس بین المللی پژوهش در مهندسی، علوم و تکنولوژی، سال
تعداد صفحات: ۱۰
Multi spherical sliding bearings exhibits adaptive stiffness and adaptive damping behavior because of it’s structure. It means that stiffness and damping changes during different sliding phases .Furthermore, since the sliding displacement shared among multiple surfaces, multi spherical sliding bearings are more economical than the other kinds of bearings. These properties helps designers to have optimized design. DCFP and DVFPI isolators are in multi spherical sliding bearings category. In this study the behavior and force–displacement relationships of these isolator studied and compared. At the end some of the most important factors to design optimization are mentioned<\div>

۳Height Effect on Response Modification Factor of Open Chevron Eccentrically Braced Frames
اطلاعات انتشار: Iranica Journal of Energy & Environment، سوم،شماره۱، ۲۰۱۲، سال
تعداد صفحات: ۶
The necessity of making buildings taller and height of new buildings is now one of the major problems in building design and codes of interest is located. With height, the need for further ductility and the capability of energy dissipation can be a significant role in the proper and safe design of structures to play. It seems that changes the height of buildings can be treated directly on the response modification factor of structures and thus the seismic performance of structures under severe earthquake to be effective. This research is an attempt to evaluate the ductility, over–strength and response modification factors of the Open Chevron Eccentrically Braced Frames (EBFs) with 5, 10, 15 and 20 stories under Tabas, Naghan, Bam and El– Centro strong ground motions. These frames were analyzed by using static pushover analysis, linear dynamic and incremental nonlinear dynamic analysis and the values of these factors for different models have been determined separately and it is resulted that with increasing the height of buildings, the ductility reduction factor and the response modification factor of EBFs, decrease, but this variation hasn’t any influence on the over strength reduction factor.

۴Seismic Fragility Assessment of Special Truss Moment Frames (STMF) Using the Capacity Spectrum Method
اطلاعات انتشار: Civil Engineerng Infrastructures Journal، چهل و هشتم،شماره۱، Jun ۲۰۱۵، سال
تعداد صفحات: ۸
Fragility curves represent the probabilities that structural damages, under various levels of seismic excitation, will exceed the specified damage states by means of earthquake intensity damage relations. Conceptual aspects related to seismic vulnerability, damage and risk evaluation are discussed first, together with a short review of the most widely used possibilities for the seismic evaluation of structures. The capacity spectrum method starting from capacity and fragility curves is then discussed. The determination of capacity curves for buildings using a non–linear structural analysis tools is then explained, together with a simplified expeditious procedure allowing the development of fragility curves. Next, the seismic risk of the special truss moment frame (STMF) systems of Tehran, the capital of Iran, is analysed in this paper using the capacity spectrum method. The seismic hazard of the studied area is described by using the reduced 5%–damped elastic response spectra. Significant damage is obtained for mid–rise and high–rise special truss moment frames with a Vierendeel middle panel, because of the buckling and early fracture of truss web members. Special truss moment frames with an X–diagonal middle segment also show a low seismic capacity leading to significant expected damage.
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