Automated 3D solid fem generator of complex structures using laser scan data

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2019

Öğrenci: MAHA O. M. SHAREI

Danışman: AHMET TÜRER

Özet:

For newly designed buildings, 3D modeling has become an integral part of analysis and design procedure using several simplified approaches by recognized and available software; in which user manually defines the geometry, loads, material properties, and support conditions of structures. Nevertheless, geometry modeling for historical complex structures, especially for masonry type construction, wall thicknesses, openings, section losses are difficult to be accurately defined in analysis programs. Changing wall thickness and alterations to the geometry of historical structures are usually difficult to be modeled with shell members. Therefore, a 3D solid FEM is more accurate for modeling of complex masonry structures. Laser scanning cameras are now widely used for taking inside and outside architectural surveys. The available commercial 3D solid meshing tools are very sensitive to the accuracy and perfection of the volumetric geometry. The development of an innovative algorithm to directly generate 3D solid finite element model (FEM) using point cloud is targeted in this thesis. The developed algorithm is applied and tested on two case studies of complex masonry structures. A comparison of analysis results of the historical structure of Şehzade Mosque is carried out between a volumetric solid finite element model generated with the developed software and a simplified shell FEM. The solid models that are automatically generated using the developed software have more realistic results regarding stress distribution; whereas, shell model has higher stress concentrations because of sharp edges and distortion of the geometry.