In this study; specially orthotropic laminated plates are modeled and equilibrium equations are obtained. These equilibrium equations are solved by finite difference method. A computer code is developed for this purpose. Depending on the finite difference mesh size the correct plate mid-point deflection value is determined and displacement of the mid-plane are obtained. Specially orthotropic laminated plates having Navier SS-1 boundary conditions at the four edges are analyzed for various loading conditions. Some examples which are taken from literature are solved and it is observed that our results are in good agreement with them.
Bu çalışmada plak düzlemine dik yükle yüklenmiş basit mesnetli ortotrop ince plaklar modellenerek denge denklemleri oluşturulmuştur. Plağa etkiyen yük tipine bağlı olarak ortotrop plağa etkiyen düşey yüklerin çift Fourier serisine açılım katsayıları değişmektedir. Ortotrop plağın malzeme özellikleri izotrop plaktan farklı olarak iki farklı elastisite modülü, Poisson oranı ve kayma modülü şeklindedir. Bu özelliklere bağlı olarak plak eğilme rijidlikleri farklı şekilde hesaplanmaktadır. Denge denklemleri de bu rijidlikler kullanılarak oluşturulmaktadır. Bu denge denklemleri çift Fourier serileri kullanılarak çözülmüştür. Problemin çözümü için bir bilgisayar programı geliştirilmiştir. Dört kenarından basit mesnetli ortotrop plaklar çeşitli yükleme durumlarına göre incelenmiştir. Ortotrop plakta oluşturulan ağın tüm noktaları için düşey çökme ve moment değerleri hesaplanmıştır. Hesaplanan bu değerler grafikler şeklinde sunulmuştur. Konu ile ilgili literatürdeki örnekler çözülerek ortotrop plağın orta noktası için elde edilen sonuçların literatürdeki sonuçlar ile büyük bir uyum içerisinde olduğu gösterilmiştir.
Metal ceiling tiles can be used for a variety of space, including commercial, office and other public spaces. They are widely used for suspending ceilings and other architectural applications in a range of different perforation patterns to suit both mechanical and aesthetic requirements. These perforated panels made of steel, aluminum, bras, etc. are also known as stamping plates or sheets depending on its thickness and area of usage. In this study, perforated ceiling tiles are modelled as rectangular thin plates with various hole patterns which are simply supported on all its boundaries. The main idea is to find out the effect of the holes on the bending behaviour of the perforated plate which is the governing attitude of a ceiling tile. The other parameters which determined about the behaviour of the plates are deflection, moments and stresses. The analyses were performed on various models systematically by number, diameter and location of holes. As a result of these analyses the relationships between the applied force and maximum values of internal forces have been calculated by using APDL codes based on Finite Element Method to find out the optimum hole pattern. According to analysis results; 3D graphics are developed to design proper hole patterns for Regular Perforated Metal Ceiling Tiles.
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