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

Download

index.pdf

Date

2019

Author

Sharei, Maha O. M.

Metadata

Show full item record

Item Usage Stats

297
views

156
downloads

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.

Subject Keywords

Structural engineering., Finite element method., Structural analysis (Engineering)., Numerical grid generation (Numerical analysis).

URI

http://etd.lib.metu.edu.tr/upload/12623133/index.pdf
https://hdl.handle.net/11511/28054

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

A MATLAB toolbox for finite element analysis of structures Kandemir, Volkan; Oral, Süha; Department of Mechanical Engineering (2014) In this study, an open source program for structural analysis was developed in MATLAB programming environment. Program was organized in object oriented manner by four new developed classes. Moreover, a graphical user interface for the end users was created. Furthermore, eight kinds of element including Plane Truss, Space Truss, Plane Frame, Space Frame, Linear Triangular, Bilinear Quadratic, Linear Tetrahedral and 3 Node Shell elements are ready to use. Elements were qualified by comparing the results obtai...
Multi objective conceptual design optimization of an agricultural aerial robot (AAR) Özdemir, Segah; Tekinalp, Ozan; Department of Aerospace Engineering (2005) Multiple Cooling Multi Objective Simulated Annealing algorithm has been combined with a conceptual design code written by the author to carry out a multi objective design optimization of an Agricultural Aerial Robot. Both the single and the multi objective optimization problems are solved. The performance figures of merits for different aircraft configurations are compared. In this thesis the potential of optimization as a powerful design tool to the aerospace problems is demonstrated.
Computational modeling of cardiac electrophysiology: A novel finite element approach Göktepe, Serdar (Wiley, 2009-07-09) The key objective of this work is the design of an unconditionally stable, robust, efficient, modular, and easily expandable finite element-based simulation tool for cardiac electrophysiology. In contrast to existing formulations, we propose a global-local split of the system of equations in which the global variable is the fast action potential that is introduced as a nodal degree of freedom, whereas the local variable is the slow recovery variable introduced as an internal variable on the integration poin...
Multiobjective Design Optimization of Building Space Layout, Energy, and Daylighting Performance Gürsel Dino, İpek; Üçoluk, Göktürk (American Society of Civil Engineers (ASCE), 2017-09-01) Computational tools for early architectural design need to address issues related to building performance and integrally consider early design decisions regarding building form, spatial layout, orientation, and envelope articulation. This paper presents (1) a design optimization tool, Multiobjective Architectural Design Explorer (MADE) that supports performative-based building design, and (2) a design exploration strategy that effectively operationalizes MADE for Pareto-based comparative search. M...
Computationally enhanced techniques for practical optimum design of steel structures Kazemzadeh Azad, Saeid; Hasançebi, Oğuzhan; Department of Civil Engineering (2014) Practical optimum design of structural systems via modern metaheuristic algorithms suffers from enormously time-consuming structural analyses to locate a reasonable design. This study is an attempt to reduce the computational effort of optimization process involved in real-life applications through development of alternative techniques to the existing computationally expensive methods. Basically two main approaches are considered as (i) investigating the algorithmic structure of the existing metaheuristics ...

Citation Formats

M. O. M. Sharei, “Automated 3D solid FEM generator of complex structures using laser scan data,” M.S. - Master of Science, Middle East Technical University, 2019.