IJET Vol. 8, Issue 2, June 2023
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Öğe Influence of the Web Opening Shapes on the Bending and Free Vibration Responses of Castellated Steel Beams(İstanbul Gelişim Üniversitesi / Istanbul Gelisim University, 2023) Mezher, Nihad Abdulzahra Mezher; Noori, Ahmad Reshad; Ertürkmen, DuyguIn recent years, the use of castellated beams has increased significantly across all types of structures. The castellated beam is one of several methods for reducing the weight and cost of steel in construction. In this study, the static and dynamic behavior of castellated beams is investigated via the three-dimensional finite element method. The primary objective of this study is to investigate in detail the effect of web opening shapes on displacement, stress values, and free vibration of castellated beams. The investigation is done using ANSYS 22 R1. In the analysis, 4 different web opening types circle, square, pentagon, and hexagon are used. To generate the models via the finite element method a 10-node tetrahedral type finite element is implemented. This study will employ a linear isotropic homogeneous material with the mechanical properties of steel. As boundary conditions, fixed – fixed, fixed – pinned, and fixed – free are considered. The results for circular, square, pentagon, and hexagon castellated beams made from IPE120, IPE180 and IPE240 profiles are presented in detail. Based on the results, it is seen that the type of web opening has a significant effect on the displacements, von-Mises stresses, maximum shear stress and free vibration values of the considered structures.Öğe Proposed Framework for Daylight-Focused Homes During Design Development(İstanbul Gelişim Üniversitesi / Istanbul Gelisim University, 2023) Yıldırım, Semih Göksel; Baur, Stuart W.; Yarbrough, Thomas G.; Nieters, MatthewSolar decathlon is held biannually, and participant universities have a unique chance to locate solar houses on campus as a living lab after the contest. A variety of performance criteria are evaluated during the contest and daylighting is one among them. Complicated analysis tools, design solutions, and their effectiveness are major challenges during the design development of new solar houses. This challenge definition leads to developing a daylighting guideline for new solar house design. To provide a roadmap of validity of emerging daylighting metrics, demonstration of the daylighting performance of built-up solar houses, and daylighting guideline for design parameters with recent technology on new solar house design are the specific objectives of this study. The manuscript aims to examine the existing daylighting design tools while proposing a roadmap for how to use emerging metrics over solar house design. Three solar decathlon entries of Missouri University of Science and Technology are selected for post-occupancy evaluation to verify selected design tools. After analyze method, tools and final products are introduced which can be used on case studies, impact on research and education is discussed in the paper. Experiential method proposal for daylighting design have three phases and these are; the daylight metrics, the daylight performance and impact on research and education. It would be beneficial in the future to have this as a design guide, especially for any residential buildings rather than just solar houses.Öğe Waste Glass “An Alternative of Cement and Fine Aggregate in Concreteˮ(İstanbul Gelişim Üniversitesi / Istanbul Gelisim University, 2023) Pashtoon, Muhammad Israr; Miakhil, Shafiullah; Behsoodi, Mohammad MukhlisThe major aim of this study is to use Waste Glass Powder (WGP) which is obtained from grinding glass waste using an abrasion apparatus, as cement and a fine aggregate substitute in concrete. The physical and mechanical characteristics, workability, and compressive strength of concrete were studied by using WGP as cement and fine aggregate replacement simultaneously. In order to perform correctly, the glass has to be sieved to particle sizes of less than 150 µm sieve for cement replacement and 4.75 mm for fine aggregate replacement. WGP was used to replace the cement and fine aggregate in concrete, yielding products with respective cement contents of 10.0% and 15% and fine aggregate contents of 15.0% and 20%, and the properties of this concrete have been compared with reference specimens with zero replacement. Cube specimens were cast, cured, and tested for compressive strength and workability at 7, 14, 28, and 56 days of age, and the results were then compared to those of traditional concrete. The use of WGP as a cement and fine aggregate substitute resulted in a reduction in concrete's compressive strength and workability. However, the findings revealed that WGP could be used as a partial substitute for cement and fine aggregates, with 10 to 15% of cement and fine aggregate substitution by WGP being the optimum in terms of strength and economy. As a result, we can utilize it in structures that are moderately heavy.Öğe Mechanical and Physical Performance of Portland Cement Composites with Partial Replacements of Metakaolin and Ulexite(İstanbul Gelişim Üniversitesi / Istanbul Gelisim University, 2023) Yıldırım, Duygu; Al-Mashhadani, Mukhallad Mohammad MawloodFabricating green binding materials are gaining a great importance in the construction sector recently. This rising interest is based upon the need for more sustainable and environment-friendly alternatives to conventional cementitious materials by utilizing waste materials and mineral by-products in the binding matrices through partial or complete replacement with Portland cement. In this paper, an experimental investigation was conducted to examine the effect of using a boron waste, namely ulexite, along with metakaolin as partial replacements with Portland cement. By this means, flow table, setting time, compressive and flexural strengths, unit weight, water absorption, and porosity tests were carried out on twelve different specimens, including the amount of ulexite of 5% and 7%, metakaolin of 10% and 20%, and amount of superplasticizer additive of 1%. The main conclusions of this work showed that using ulexite and metakaolin up to certain percentages is beneficial in terms of mechanical and physical properties. A further increase in the addition can lead to a decrease in the performance of the matrix.
