FRP KOMPOZİT MALZEMELER İLE GÜÇLENDİRİLMİŞ BETONARME ÇERÇEVELERİN PERFORMANSA DAYALI SİSMİK RETROFİT TASARIMI

Öz

Fiber takviyeli polimer (FRP) kompozit malzemelerin, betonarme (RC) elemanların sismik olarak güçlendirilmesi, sismik açıdan yetersiz sistemlerin onarılması ve güçlendirilmesi amacıyla kullanımı köklü bir teknik haline gelmiştir. FRP ile güçlendirilen betonarme elemanların davranışının modellenmesi ve performansa dayalı analiz ve tasarım kavramlarının uygulanması konusunda son yıllarda önemli ilerlemeler kaydedilmesine rağmen, güçlendirilmiş çerçevelerin genel sismik davranışını araştıran çalışmalar hala sınırlıdır. Bu makale, betonarme çerçeveler için performansa dayalı FRP güçlendirme tasarımına yönelik bir metodoloji sunmakta ve farklı güçlendirme konfigürasyonlarına sahip iki boyutlu çerçeve modelleri üzerinde gerçekleştirilen sayısal çalışmalar aracılığıyla bunun analitik bir incelemesini sunmaktadır. Bu kapsamda, kare veya dikdörtgen kolonlu çerçeve sistemlerin eğilme kapasitesini arttırmak amacıyla kirişlerin, ilave sargılama ve süneklik için ise kolonların sarılması şeklinde FRP ile güçlendirilmesi ele alınmıştır. Çerçevelerin güçlendirme öncesi ve sonrası doğrusal olmayan itme analizleri, literatürde önerilen çeşitli çelik sargılı ve FRP sargılı beton modellerinin kullanımına dayalı moment-eğrilik analizlerinden belirlenen doğrusal olmayan mafsal parametreleri kullanılarak karşılaştırmalı olarak gerçekleştirilmiştir. Analiz sonuçları ışığında her bir güçlendirme konfigürasyonunun çerçevelerin sismik davranışına ve performansına katkısı ortaya konularak FRP ile güçlendirme kararlarına kılavuzluk yapacak çeşitli tasarım hususları öne çıkarılmıştır.

Anahtar Kelimeler

• FRP Güçlendirme
• İtme Analizi
• Deprem Performansı
• Betonarme Çerçeveler
• Sargılama

PERFORMANCE-BASED SEISMIC RETROFIT DESIGN FOR RC FRAMES USING FRP COMPOSITE MATERIALS

Öz

Seismic retrofitting of reinforced concrete (RC) members using fiber reinforced polymer (FRP) composite materials has become a well-established technique for repairing and strengthening seismically deficient systems. Although there has been significant progress on behavioral modeling of FRP retrofitted RC members as well as on implementation of performance-based analysis and design concepts, the studies investigating the overall seismic behavior of the retrofitted frames are still limited. This paper presents a methodology for performance-based FRP retrofit design for RC frames and provides an analytical investigation of this through numerical studies performed on 2-D frame models with different retrofit configurations. More specifically, frame systems with square or rectangular columns were assumed to be retrofitted through FRP strengthening of beams for improved flexural capacity and/or wrapping of columns for additional confinement and resulting ductility. Nonlinear pushover analyses of frames before and after retrofitting were performed using nonlinear hinge parameters determined from moment-curvature analyses based on comparative use of various steel- and FRP-confined concrete models proposed in the literature. Analysis results reveal the expected contribution of each retrofit configuration to the seismic behavior and performance of the frames, highlighting various design considerations for proper FRP retrofit decisions.

Anahtar Kelimeler

• FRP Retrofitting
• Pushover Analysis
• Seismic Performance
• RC Frames
• Confinement

Kaynakça

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