Betonarme Manto Uygulamasının Prefabrike Yapıların Deprem Performansına Etkisi

Öz

Ülkemizdeki sanayi yapıların çoğunluğunu, kolon‑kiriş birleşim bölgelerinde moment aktarımı olmayan tek katlı prefabrike sistemleri oluşturmaktadır. Yaşanmış depremler sonrasında yapılan gözlemler; prefabrike yapıların deprem etkisi altında yüksek yatay yerdeğiştirmeleri nedeniyle kolon‑kiriş birleşim bölgelerinde ve yapı genelinde önemli hasarların oluştuğunu göstermiştir. Bu tip yapı sistemlerinin depreme karşı güçlendirilmesi, sadece yüksek maliyetli cihazlar için değil öncelikli olarak insan yaşamı açısından hayati önem taşımaktadır. Bu çalışmada betonarme (BA) mantolama yönteminin prefabrike yapıların deprem performansındaki rolü sayısal olarak incelenmiştir. Çalışmanın ilk bölümünde, literatürde deneysel sonuçları yer alan BA mantolu ve mantosuz kolonların nümerik modelleri oluşturulmuştur. Tersinir tekrarlı yerdeğiştirme protokolü etkisi altında yapılan deneylerden elde edilen yük-yerdeğiştirme ilişkileri, oluşturulan nümerik model sonuçları ile karşılaştırılmıştır. Nümerik modeller, belirli yerdeğiştirme eşikleri arasında deneysel sonuçları iyi bir şekilde tahmin edilebilmektedir. Deneysel olarak kalibre edilmiş olan nümerik model, üç boyutlu sanayi tipi mevcut bir yapı sisteminin lineer olmayan dinamik analizlerinde kullanılmıştır. Sayısal sonuçlar, mantolama sayesinde prefabrike yapının ortalama en büyük ve en küçük göreli ötelemelerin %54 ile %72 arasında değişen oranlarda azaldığını göstermiştir. Mevcut yapının seçilen kolonları, birim şekildeğiştirme açısından değerlendirildiğinde; güvenlik sınırı (GV) civarında olan kesit performansının BA mantolama ile minimum hasar sınırının (MN) altına çekildiği görülmüştür.

Anahtar Kelimeler

• Betonarme mantolama,Prefabrike yapılar,Dinamik analiz,Taban kesme kuvveti,Şekildeğiştirme düzeyi

The Effects of Reinforced Concrete Jacketing on the Earthquake Performance of Precast Structures

Öz

The majority of industrial buildings located in our country consist of single-story precast systems with pinned beam-to-column connections. Observations made after earthquakes showed that due to high lateral displacement demands occurred under the effects of earthquake loads; significant damage was accumulated throughout the beam-to-column connections and whole structure. Strengthening such building systems against earthquake loads is not only crucial for high-cost devices and machinery but also very important in terms of human life as a priority. In this study, the effects of reinforced concrete (RC) jacketing technique on the global earthquake performance of precast structures was examined numerically. In the first part of the study, experimental results of bare and RC jacketed columns, which exist in the recent literature, were used as a benchmark for the development of numerical models. The force-displacement relations obtained from quasi-static experiments were compared with the numerical results. The numerical models are successful to estimate the experimental results within the range of distinct displacement levels. Validated numerical models were used for nonlinear dynamic analysis of an existing 3D precast system. Numerical results showed that the application of RC jacketing technique is effective to decrease the average maximum and minimum drift values by the ratios of 54-72%. Determinations of strain levels for the selected columns of the system showed that; the RC jacketing retrofitting technique is effective to increase the sectional performance by shifting the strain demands from safety limit (GV) to minimum damage limit (MN).

Anahtar Kelimeler

• Reinforced Concrete Jacketing,Precast Structures,Dynamic Analysis,Base Shear Force,Strain level

Kaynakça

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