Shape optimisation of pinended i-section columns
Başlık çevirisi mevcut değil.
- Tez No: 795266
- Danışmanlar: PROF. LEROY GARDNER
- Tez Türü: Yüksek Lisans
- Konular: Çevre Mühendisliği, Şehircilik ve Bölge Planlama, Environmental Engineering, Urban and Regional Planning
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2022
- Dil: İngilizce
- Üniversite: Imperıal College London
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
The optimisation of pin-ended I-section columns with three different lengths produced by wire and arc additive manufacturing method, which is one of the metal additive manufacturing methods, has been studied in this paper. The aim of the optimisation has been to design a shape of column providing a higher resistance against failure and making every part of the column utilised under the concentrated loading applied on top of the column. Owing to the opportunity of the ability to design flexible geometries provided by additive manufacturing, redistributing materials from the less affected part of the columns to the more affected parts, and hence creating columns with varying cross-sections by maintaining the volume constant have been the basis of this design. For creating the varying cross-sectional columns, the shapes of major axis global buckling modes have been used as shape functions forming the geometry of the column. In order to design columns and perform the analyses for the columns, widely used finite element software ABAQUS and python scripting to automate some steps have been used. As a result, the optimisation goal has been achieved for all columns when, in fact, they have been created by using the first shape function corresponding to a sinusoidal shape. However, an improvement has been investigated for a 1500mm length column by creating it with other shape functions, as well. At the end, the optimal shape of the 1500mm length column, which has the ratio of the height at the middle to the height at the ends (Hmiddle/Hends) of 1.226 and created by using the fifth shape function, has been presented. The optimal shapes of 900 and 300mm columns created with the first shape function have been presented, and the ratios of Hmiddle/Hends for them have been found as 1.08 and 1.06, separately. In addition, when compared to straight reference columns for each length, the failure resistances of 1500mm, 900mm and 300mm length columns have improved at the rates of 146.2%, 29.3% and 8.86%, respectively
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