| PaperNO | Paper / Abstract |
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SE6-012
10:50
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11:05
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Image Analysis for 3-D Displacement Measurement in Structural Experiments
Image analysis of digital photos and videos is capable of measuring displacements, deformation, and surface cracks of structures, and has potential for structural health monitoring applications. The rapid development of mass market of digital imaging technology, consumer digital cameras today are sufficient to capture satisfactory displacement and deformation information for many research demands if images are carefully analyzed. However, three-dimensional dynamic response monitoring and measurement on large-scale structures pose challenges of camera calibration and synchronization to image analysis. Without satisfactory camera position and orientation obtained from calibration and well-synchronized imaging, significant errors would occur in the dynamic responses during image analysis and stereo triangulation. This paper introduces two camera calibration approaches that are suitable for large-scale structural experiments, as well as a synchronization method to estimate the time difference between two cameras and further minimize the error of stereo triangulation. Two structural experiments are used to verify the calibration approaches and the synchronization method to acquire dynamic responses. The results demonstrate the performance and accuracy improvement by using the proposed methods.
Yuan-Sen Yang, Cheng-Bang Li, Ching-Ming Chang, An-Chi Tsai
3-D measurement, camera calibration, signal synchronization, structural experiments
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SE6-013
11:05
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11:20
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A SOFTWARE FRAMEWORK FOR GPU BASED FINITE ELEMENT PARALLELIZATION ON OPENSEES FRAMEWORK
Nonlinear response history analysis is the kernel of performance based analysis framework for seismic assessment of structures. However, accurate and sophisticated nonlinear response history analysis is normally hindered by its huge computing cost, including impractically long computing time and memory requirement. While parallel computing is the major way for supercomputing society to encounter computational problems, conventional structural analysis programs are not capable of bring the hardware capability into full play because lack of parallel algorithm re-design, parallel software design and implementation, and research and development. Based on an existing design of GPU based element-by-element parallelization for OpenSees framework, this paper introduces a software framework for more flexibility and extensibility for transforming more element types to GPU parallelization. The framework and its implementation is introduced and its applications is demonstrated. A fiber-section based beam column element and a MITC4 shell element are implemented based on this framework. Numerical studies are verified and presented in this paper to demonstrate the robustness and efficiency of this framework.
Yuan-Sen Yang, Bo-Yuan Sun
GPU parallelization, nonlinear response history analysis, OpenSees
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SE6-014
11:20
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11:35
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Particle-Based Methods and Their Potentials for Earthquake Engineering
Different from some other numerical approaches, Particle-Based Methods (PBMs) use a set of Lagrangian points to illustrate a physical field. Since the continuity is not necessary condition, it gives PBMs the ability to model the phenomenon of material separation, such as failure and crack of solid material, or free surface of fluid. Since each PBM has its advantages and constraints, this paper briefly introduces the characteristics and potentials in earthquake engineering of several famous PBMs, which includes the Molecular Dynamics (MD), Discrete Element Method (DEM), Smoothed-Particle Hydrodynamics (SPH), Material Point Method (MPM), and PeriDynamics (PD).
Wei-Tze Chang
Earthquake Engineering, Particle-Based Methods
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H5-012
11:35
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11:50
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RESCUE OPERATIONS AT COLLAPSED HOUSES BY POLICE RESCUE TEAMS IN THE KUMAMOTO EARTHQUAKES
Information such as the scale of spaces inside collapsed houses, concrete entrapment situations (including whether or not victims were being pressed by heavy objects), and actual rescue operations procedures are very useful for rescue training design. On the other hand, information on rescue sites and victims is a very sensitive matter that has never been clarified before in enough detail to be considered in rescue training design. Aiming to collect detailed information useful for rescue training design, the authors of this study conducted an extensive survey on the rescue operations of police teams in houses collapsed due to the 2016 Kumamoto earthquakes and clarified the situations and aspects in detail, such as the scale of spaces inside the collapsed houses, concrete entrapment situations, actual rescue operations procedures, and duration of each rescue process. A total of 39 cases of rescue operations conducted at collapsed building sites with a story collapse were examined. As for the results, the study obtained detailed information on damage grades of buildings in which the rescue operations were conducted, equipment used to stabilize collapsed houses, entry points of rescue teams, locations of victims found entrapped inside the collapsed houses, physical circumstances underneath the entrapped victims, situations of victim entrapment, categories of pressing objects causing entrapments, routes used for extrication, and duration of each rescue process. These findings comprise very useful information for the design of rescue operation training. Although our results have restrictions since our target was limited on police operations and cases in the Kumamoto earthquakes, they are highly significant as they clarify in detail the actual state of rescue operations conducted in collapsed houses in details, which had never been done before.
Maki Koyama, Yoshinobu Kako, Akiko Yoshimura, Naoya Miyasato, Fumio Seki, Hidemaru Shimizu, Fumiaki Satoh
2016 Kumamoto earthquakes, collapsed building, entrapment, rescue operation
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H5-011
11:50
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12:05
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APPLICATION OF MONITORING INFORMATION IN SCIENCE PARKS TO EARTHQUAKE DISASTER MANAGEMENT
Science Parks are the locations clustering most high-tech industries in Taiwan. Since the high productivity and international competitiveness of science parks, the disaster impact could lead to a high economic loss. Therefore, improving the resilience of science parks disaster management is an important issue for economic competitiveness of a nation. Earthquake disaster is a main threat for science parks, in order to enhance the resilience of the parks subjected to earthquakes, it is necessary to deliver the real-time earthquake monitoring information for stakeholders to understand the earthquake disaster information. This study is a part of the research project the Ministry of Science and Technology. The project provides understanding to current condition of science park protection and management to earthquakes. In order to provide an information service module for partners around science parks, an disaster information module was developed and several seismic sensors was set up for science parks ; which can be used as an emergency response information and improve the disaster management tasks of earthquake disaster for a science parks.
Min-Cheng Teng, Siao-Syun Ke
disaster information module, disaster management, science parks
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