Physics engine-driven visualization of deactivated elements and its application in bridge collapse simulation

Element deactivation is one of the most suitable methods in a finite element (FE) analysis of discontinuous features of collapse accidents. However, deactivated elements are typically invisible in the general purpose FE analysis, leading to a very incomplete outcome. To visualize the deactivated ele...

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Published in:	Automation in construction Vol. 35; pp. 471 - 481
Main Authors:	Xu, Zhen, Lu, Xinzheng, Guan, Hong, Ren, Aizhu
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier B.V 01.11.2013 Elsevier
Subjects:	Accidents Applied sciences Bridge collapse Bridges Building failures (cracks, physical changes, etc.) Buildings. Public works Collapse Computation methods. Tables. Charts Computer simulation Deactivated elements Deactivation Durability. Pathology. Repairing. Maintenance Engines Exact sciences and technology Finite element method Fragment simulation Fragments Physics engine Structural analysis. Stresses Three dimensional Visualization Visualization Physics engine Bridge collapse Deactivated elements Fragment simulation Collapse Deactivation Fragment Modeling Case study Bridges Simulation Physical model Integrated system Application Comparative study
ISSN:	0926-5805
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Abstract	Element deactivation is one of the most suitable methods in a finite element (FE) analysis of discontinuous features of collapse accidents. However, deactivated elements are typically invisible in the general purpose FE analysis, leading to a very incomplete outcome. To visualize the deactivated elements, a 3D simulation method of fragments based on a physics engine is proposed herein. A working system for fragment simulation is designed by integrating a graphics engine, an FE analysis and a physics engine. To reduce the extensive computational workload due to massive fragments, a grid-clustering algorithm for fragment modeling is also proposed. Using the proposed simulation methodology, the collapse processes of two bridges are completely replicated. The results demonstrate a realistic and real-time visual simulation of deactivated elements, which complements the limitations of the general FE analysis results. This study provides an important reference for conducting detailed investigations of bridge collapse accidents. A 3D real-time visualization method of deactivated elements using fragment simulation is proposed to reconstruct a complete process of bridge collapses, which complements the limitations of the general FE analysis results. [Display omitted] •We propose a visualization method of deactivated elements by fragment simulation.•We reconstruct a complete process of bridge collapses in a 3D visual simulation.•Visual simulation of bridge collapse is real-time.•Fragment simulation has proven accurate.•Fragment simulation complements the limitations of the general FE analysis results.
AbstractList	Element deactivation is one of the most suitable methods in a finite element (FE) analysis of discontinuous features of collapse accidents. However, deactivated elements are typically invisible in the general purpose FE analysis, leading to a very incomplete outcome. To visualize the deactivated elements, a 3D simulation method of fragments based on a physics engine is proposed herein. A working system for fragment simulation is designed by integrating a graphics engine, an FE analysis and a physics engine. To reduce the extensive computational workload due to massive fragments, a grid-clustering algorithm for fragment modeling is also proposed. Using the proposed simulation methodology, the collapse processes of two bridges are completely replicated. The results demonstrate a realistic and real-time visual simulation of deactivated elements, which complements the limitations of the general FE analysis results. This study provides an important reference for conducting detailed investigations of bridge collapse accidents. A 3D real-time visualization method of deactivated elements using fragment simulation is proposed to reconstruct a complete process of bridge collapses, which complements the limitations of the general FE analysis results. [Display omitted] •We propose a visualization method of deactivated elements by fragment simulation.•We reconstruct a complete process of bridge collapses in a 3D visual simulation.•Visual simulation of bridge collapse is real-time.•Fragment simulation has proven accurate.•Fragment simulation complements the limitations of the general FE analysis results. Element deactivation is one of the most suitable methods in a finite element (FE) analysis of discontinuous features of collapse accidents. However, deactivated elements are typically invisible in the general purpose FE analysis, leading to a very incomplete outcome. To visualize the deactivated elements, a 3D simulation method of fragments based on a physics engine is proposed herein. A working system for fragment simulation is designed by integrating a graphics engine, an FE analysis and a physics engine. To reduce the extensive computational workload due to massive fragments, a grid-clustering algorithm for fragment modeling is also proposed. Using the proposed simulation methodology, the collapse processes of two bridges are completely replicated. The results demonstrate a realistic and real-time visual simulation of deactivated elements, which complements the limitations of the general FE analysis results. This study provides an important reference for conducting detailed investigations of bridge collapse accidents.
Author	Guan, Hong Lu, Xinzheng Ren, Aizhu Xu, Zhen
Author_xml	– sequence: 1 givenname: Zhen surname: Xu fullname: Xu, Zhen email: xuzhen@tsinghua.edu.cn organization: Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China – sequence: 2 givenname: Xinzheng surname: Lu fullname: Lu, Xinzheng email: luxz@tsinghua.edu.cn organization: Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China – sequence: 3 givenname: Hong surname: Guan fullname: Guan, Hong email: h.guan@griffith.edu.au organization: Griffith School of Engineering, Griffith Univ. Gold Coast Campus, Queensland 4222, Australia – sequence: 4 givenname: Aizhu surname: Ren fullname: Ren, Aizhu email: raz-dci@tsinghua.edu.cn organization: Dept. of Civil Engineering, Tsinghua Univ., Beijing 100084, China
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Keywords	Visualization Physics engine Bridge collapse Deactivated elements Fragment simulation Collapse Deactivation Fragment Modeling Case study Bridges Simulation Physical model Integrated system Application Comparative study
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Snippet	Element deactivation is one of the most suitable methods in a finite element (FE) analysis of discontinuous features of collapse accidents. However,...
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SubjectTerms	Accidents Applied sciences Bridge collapse Bridges Building failures (cracks, physical changes, etc.) Buildings. Public works Collapse Computation methods. Tables. Charts Computer simulation Deactivated elements Deactivation Durability. Pathology. Repairing. Maintenance Engines Exact sciences and technology Finite element method Fragment simulation Fragments Physics engine Structural analysis. Stresses Three dimensional Visualization
Title	Physics engine-driven visualization of deactivated elements and its application in bridge collapse simulation
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