No abstract

Reinforced concrete (RC) members may expose to impulsive dynamic loads due to the reasons such as the explosions occurring in the interior or exterior part of them, rockfall, the vehicle crash to the bridges, the collision of masses with the effects of floods and landslide. Many studies have investigated the effects of impulsive dynamic loads on the beam, column, and slab RC structural elements have been investigated in the literature. However, the authors have not encountered any study focused on the impact behavior of beam to column connections of the frames constructing the bearing system of reinforced concrete structures. Therefore, an experimental study has been planned to investigate RC beam impact behavior to column connections strengthened with carbon fiber‐reinforced polymer (CFRP) strips. The concrete compressive strength, shear reinforcement spacing, CFRP strip spacing, and input impact energy applied to test specimens were taken as experimental variables. The time histories of impact load acting on test specimens, accelerations, displacements, and the strains measured from CFRP strips have been recorded in experiments. The experimental variables' effect on dynamic responses of RC beam to column connections strengthened with CFRP strips subjected to impact load has been interpreted in detail. The study's scope and improved numerical analysis procedure have also been introduced to verify experimental results. Good agreement between numerical and experimental results demonstrated that the presented numerical procedures could be safely used for evaluation of impact behavior of RC beam to column connections strengthened with CFRP strips.

This study investigated the behavior of slabs produced with low compressive strength concrete without reinforcements under the effect of sudden dynamic impact loading. In addition, an experimental study was conducted by proposing a strengthening method with anchored carbon fiber‐reinforced polymer (CFRP) strips to strengthen the nonreinforced slabs with low‐strength concrete against sudden dynamic impact loads to improve their performance. The variables examined in the experimental study were the placement of the CFRP strips adhered to the concrete slabs for strengthening purposes and anchors in the strips. A constant energy level of impact loading was applied to the concrete slab test specimens with the authors' free weight drop test setup. The acceleration‐time, displacement‐time, strain‐time, and applied impact loading‐time measurements on the concrete slabs were examined, and comments were made about the strengthening method applied to the slab test specimens. In addition, numerical analysis of the tested concrete slabs with ABAQUS finite element software was performed, and the results were compared with the experimental results. In the comparison, it was investigated to what extent numerical analysis and this type of impact analysis can be done realistically and compatible with the experimental results. Within the scope of the study, the strengthening method applied with fan‐type anchored CFRP strips significantly improved and increased the impact performance of concrete slabs produced with low‐strength concrete.

No abstract

Geçmişten günümüze, insanların barınma ihtiyacını karşılamakta kullandığı ahşap malzemesi ülkemizdeki yapı sistemlerinde son yıllarda çok fazla tercih edilmemektedir. Ülkemiz; ahşap iskeletli yapı, bu tür yapılarda kullanılan ahşap malzemesinin fiziksel ve mekanik özellikleri ile ahşap yapıların avantajlarıdezavantajları konusunda yeterli bilgiye sahip değildir. Bu çalışma ile ahşap malzemesinin önemli bazı fiziksel ve mekanik özellikleri anlatılmış; ahşap yapıların Türkiye ve Dünyadaki durumu ele alınmıştır. Ahşap yapılar ile ilgili ülkemizde ve Dünyada kullanılmakta olan standartlar ve yönetmeliklerden bahsedilmiştir. Anahtar Kelimeler-Ahşap, Ahşap Yapılar, TS 647, Ahşap Standartları bstract-Timber structures construction systems which used many years for housing needs, aren't preferred in our country in recent years. Our country doesn't have sufficient knowledge about timber frame construction, wooden materials, physical and mechanical properties and advantages-disadvantages of timber construction. This study describes some of the physical and mechanical properties of wooden material, situation of timber structures in Turkey and in the world, standards and codes about timber structures are used in our country and in the world.