Planda Çıkıntılar Bulunması Düzensizliğinin L Tipi Binaların Deprem Davranışına Etkisi

Abstract

Kat planının konfigürasyonuna bağlı olarak ortaya çıkan düzensizlikler binaların deprem tepkisinin belirlenmesi ve tasarımı ile ilgili önemli zorluklara neden olmaktadır. Binanın kat planında çıkıntılar bulunması durumu bu tür bir yapısal düzensizliğe sebep olabilir. Bu çalışmada, Türkiye Bina Deprem Yönetmeliği’nde A3 türü düzensizlik olarak tanımlanan planda çıkıntılar bulunması durumu simetrik L tipi betonarme (BA) binaların deprem davranışı özelinde incelenmiştir. Kat planında çıkıntı yapan kısımların birbirine dik doğrultudaki boyutunun (a) o katın aynı doğrultulardaki plan boyutuna (L) oranı belirlenen hedefe ulaşmak için temel değişken olarak seçilmiştir. İlk olarak farklı a/L oranlarına sahip on altı BA binanın serbest titreşim analizleri gerçekleştirilmiştir. Bu analizlerde kat döşemeleri rijit ve yarı rijit diyafram olarak modellenmiştir. Binaların deprem analizi Mod Birleştirme Yöntemi ile gerçekleştirilmiş ve taban kesme kuvveti katsayısı, yanal yer değiştirme, iç kuvvet bileşeni gibi yapısal tepki parametrelerinin en büyük değerleri hesaplanmıştır. a/L oranı arttıkça döşemenin modellenmesi durumunun serbest titreşin analizi sonuçlarına ve modal hesap parametrelere etkisinin arttığı görülmüştür. Ayrıca a/L oranının L tipi binaların yapısal karakteristiklerine ve deprem davranışına önemli etkisi olduğu belirlenmiştir. Çalışmadan elde edilen bulguların L tipi binaların deprem etkileri altında davranışının anlaşılmasına ve tasarımına yönelik önemli katkılar koyması beklenmektedir.

Keywords

• A3 Türü Düzensizlik
• L Tipi Betonarme Binalar
• Serbest Titreşim Analizi
• Mod Birleştirme Yöntemi
• Elastik Deprem Davranışı

Influence of Re-Entrant Corner Irregularity on Earthquake Behaviour of L-Shaped Buildings

Abstract

Plan configuration irregularities introduce major challenges to earthquake response and design of buildings. The presence of re-entrant corners in plan configuration of a building and its lateral-force-resisting system may cause such an irregularity. In this study, re-entrant corner irregularity, which is defined as structural irregularity type A3 in Turkey Building Earthquake Code, is particularly studied for the earthquake behaviour of symmetrical L-shaped reinforced concrete buildings. To achieve this goal, the ratio of plan projection of the building beyond a re-entrant corner (a) to the plan dimension of the building in the given direction (L) is considered as the fundamental variable. Free vibration analyses of sixteen reinforced concrete L-shaped moment-resisting frame buildings having different a/L ratios are conducted. In these analyses, the floor diaphragms are modelled as rigid and semi-rigid. Mode Superposition Method is used for earthquake analysis of L-shaped building models and some of the maximum structural response quantities such as base shear coefficient, lateral displacement, and internal force component are presented. It has been observed that as the a/L ratio increases, the effects of assumptions regarding the modelling of floor slabs on the free vibration analysis results and modal parameters have increased. In addition, it has been found that the a/L ratio has a significant influence on the structural characteristics and earthquake behaviour of L-shaped buildings. The main findings of the study are expected to contribute to earthquake-resistant design of L-shaped buildings and its implementation in seismic design practice.

Keywords

• Structural Irregularity Type A3
• L-Shaped Reinforced Concrete Buildings
• Free Vibration Analysis
• Mode Superposition Method
• Elastic Earthquake Behaviour

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