سهم دیوار و تیر کوپله از اتلاف انرژی در دیوارهای کوپله بتن مسلح تحت زلزله‌های حوزه نزدیک

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران، واحد مهدیشهر، دانشگاه آزاد اسلامی، مهدیشهر، ایران

چکیده

این مقاله به بررسی انواع نیازهای انرژی در دیوارهای کوپله می‌پردازد که در آن‌‌‌ها دو دیوار بتن مسلح توسط تیرهای بتن مسلح به یکدیگر متصل شده‌اند. در ابتدا سازه‌ها با به کارگیری روش تحلیل طیفی طبق آیین‌نامه‌های معتبر طراحی می‌شوند و در ادامه با تهیه مدل غیرخطی دیوار با المان‌‌های فایبری در نرم‌افزار PERFORM-3D و انجام تحلیل تاریخچه زمانی تحت اثر زلزله‌های دور و نزدیک گسل، انرژی ورودی، انرژی جنبشی، انرژی میرایی و انرژی غیرالاستیک مورد بررسی قرار می‌گیرد و مشارکت دیوار تیر کوپله بتن مسلح در اتلاف انرژی مطالعه می‌شود. دو رویکرد مفصل یگانه (SPH) و مفصل گسترده (EPH) برای دیوار بتن مسلح در نظر گرفته می‌شود. در رویکرد مفصل یگانه، فقط در پای دیوار بتن مسلح اجازه مفصل پلاستیک داده می‌شود و بقیه نواحی دیوار به صورت الاستیک مدل می‌شود. در رویکرد مفصل گسترده، کل دیوار قابلیت گسترش پلاستیسیته را دارد. نتایج نشان داد در همه سازه‌ها سهم تیر کوپله در اتلاف انرژی غیرالاستیک از سهم دیوار بتن مسلح بیشتر است. به طور متوسط در رویکرد EPH، سهم تیرهای کوپله حدود 60 درصد و سهم دیوار بتن مسلح حدود 40 درصد از انرژی غیرالاستیک را شامل می‌شود و این اعداد در رویکرد SPH به ترتیب حدود 77 و 23 درصد است. دلیل افزایش سهم تیر کوپله از انرژی غیرالاستیک در حالت  SPHآن است که دیوار در 90 درصد از ارتفاع خود الاستیک عمل کرده و سهم دیوار کاهش می‌یابد و بنابراین سهم مشارکت تیر کوپله در انرژی غیرالاستیک افزایش خواهد یافت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Energy demands in reinforced concrete coupled walls under near and far field earthquakes with different approaches to the occurrence of wall plasticity

نویسندگان [English]

  • Hamid Beiraghi
  • Ebrahim Momen Abadi
Department of Civil Engineering, Mahdishahr Branch, Islamic Azad University,Mahdishahr, Iran
چکیده [English]

The use of reinforced concrete wall of the coupling causes better control of lateral displacement and also more energy dissipation due to the earthquake. This paper examines the types of energy demands in coupling walls in which two reinforced concrete walls are coupled by reinforced concrete beams. First, the structures are designed using the spectral analysis method according to valid regulations and then by preparing a nonlinear model of the wall with fiber elements in PERFORM-3D software and performing time history analysis due to near and near earthquakes faults, input energy, kinetic energy, energy Damping and inelastic energy are investigated and the contribution of reinforced concrete beam and wall to energy dissipation is studied. Two approaches, single plastic hinge (SPH) and extended plastic hinge (EPH), are considered for reinforced concrete walls. In the SPH approach, the plastic joint is traditionally allowed only at the foot of the reinforced concrete wall, and the rest of the wall is modeled elastically. In the EPH approach, the entire wall has the ability to expand plasticity. The results showed that in all structures, the share of coupling beams in inelastic energy dissipation is higher than the share of reinforced concrete walls. On average, in the EPH approach, the share of beam beams is about 60% and the share of reinforced concrete walls is about 40% of inelastic energy, and these numbers in the SPH approach are about 77% and 23%, respectively. The reason for the increase in the share of coupling beams from inelastic energy in the SPH model is that the wall is elastic at 90% of its height and the share of the wall decreases, and therefore the share of coupling beams in inelastic energy will increase.

کلیدواژه‌ها [English]

  • Walls
  • Reinforced concrete
  • Beams
  • Nonlinear time history analysis
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