• مقاله با عنوان:
Assessment of Structural Performance of Steel Coupling Beams with Corrugated Webs
• نویسندگان:
Mohammad Hajsadeghi , Tadeh Zirakian , Saeed Pirgholizadeh , Alireza Jahanshahi
• محل انتشار: هشتمین کنگره ملی مهندسی عمران - دانشگاه صنعتی نوشیروانی بابل - 17 و 18 اردیبهشت 93
• محور: سازه های فولادی
• فرمت فایل: PDF و شامل 8 صفحه و زبان مقاله انگلیسی میباشد.
چکیــــده:
Nowadays steel coupling beams are considered as efficient alternatives to reinforced concrete coupling beams, which can improve the ductility and seismic performance of the coupled shear wall systems. In this paper, the application of corrugated webs as an alternative to flat webs with stiffeners as a proposition for enhancing structural performance of such beams is investigated through detailed numerical simulations. Several models are developed based on some key geometrical parameters, viz. web-plate shape, web thickness, number of corrugations, and corrugation angle, and the structural performance of these models is evaluated via nonlinear pushover and cyclic analyses. It is shown that application of corrugated web makes it possible to achieve larger rotation capacity compared to that of commonly-used steel coupling beams. Moreover, the results of this study demonstrate that corrugated-web steel coupling beams possess appropriate energy absorption characteristics and are capable of dissipating the input energy in a quite desirable and efficient manner.
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مجموعه جدید حمله بازی ایتالیایی برای سفید
توسط سرگئی تیویاکف
محصول: 2013
فرمت فیلم: MP4
تعداد فیلم: 6
مدت فیلم: 1 ساعت 35 دقیقه
موضوع فیلم: گشایش برای سفید
سطح: بازیکنان مسابقات - حرفه ای
قابلیت پخش: اندروید - کامپیوتر
بهمراه فایل : PGN
Attack with the Modern Italian
by Nigel Davies
حمله با ایتالیایی مدرن
توسط نایجل دیویس
سطح: پیشرفته و بازیکنان مسابقات
زمان آموزش: 4 ساعت
محصول چیس بیس
978-3-86681-208-6:ISBN
Accordingly it has found favour with some of the World`s top players including Garry Kasparov, Vladimir Kramnik, Sergei Tiviakov, Viktor Bologan, Sergei Movsesian, Michael Adams and Boris Gelfand. Unlike the Ruy Lopez, which features many sharp theoretical variations, the emphasis in the Italian Game is on knowing where the pieces belong and understanding key plans and ideas. This makes it highly suitable for players who do not have the time to engage in ongoing maintenance of their opening systems. On this DVD Davies examines the modern treatment of the Italian with 1.e4 e5 2.Nf3 Nc6 3.Bc4 followed by 4.d3 and then usually c3. He also places the onus on attacking lines for White, often featuring him castling queenside and then charging up the kingside. Not only do such variations score heavily in club chess, they are also a lot of fun to play! Video runnig time: 4 hours Nigel
Winning with the fantasy variation
پیروزی با واریانت فانتزی
توسط لارنس ترنت
سطح:پیشرفته، بازیکنان مسابقات
زمان آموزش: 60 دقیقه
محصول چیس بیس
دارای فایل pgn برای استفاده در اندروید و کامپیوتر
The Fantasy Variation (1.e4 c6 2.d4 d5 3.f3) is a tricky try by White to steer the game into muddy waters right from the off and take Black away from the solid positions he is accustomed to in the main line variations of the Caro-Kann. Traditionally the opening never gained too much credibility amongst top players, since White's attempt to preserve his pawn centre at the cost of weakening his kingside was hardly seen as a major threat to the super-reliable Caro. However, thanks to a wave of news ideas and innovations first introduced at the 2010 European Individual Championships and many more thereafter, the variation has made a major comeback and can now be found in the repertoires of some of the world's best. In this 60 minute video, IM Lawrence Trent will discuss the 5 main variations Black has at his disposal but how with each one White has a number of ways to keep the position full of play and dynamic possibilities, leading to games which loyal Caro players will have difficulty dealing with.