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Events for May 06, 2016
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Sonny Astani Department Seminar
Fri, May 06, 2016 @ 03:00 PM - 03:30 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker: Meida Chan, Civil Engineering PhD student, USC
Talk Title: Development of a data acquisition-planning framework for hybrid data collection techniques to achieve blind-spots free 3D point cloud
Abstract: As-is 3D building models are valuable in many ways such as urban planning, historical building information storage, building renovation, facility management, building energy simulation and so on. Data acquisition for complete and accurate as-is 3D building reconstruction is a time consuming and labor intensive process. Establishing a data acquisition plan before or during the data acquisition process is necessary. As such, there has been extensive research on developing/advancing data acquisition planning algorithms with a single data acquisition technique. However, for buildings that have complex building structure and architectural elements, data collection process with a single data acquisition technique is not sufficient neither effective. The hypothesis behind this research study is that image-based technique (photogrammetry) and range-based technique (laser scanning) are complementary to each other and that the combination of the two techniques can improve the quality of the derived as-is 3D point cloud in terms of completeness and accuracy. As such, this research study will develop a framework that will provide an improved data acquisition process to support the creation of complete and accurate 3D models of existing buildings, while reducing the total cost of data acquisition by eliminating the need for site revisits and reworking of the data collection process.
Host: Lucio Soibelman
Location: Seeley G. Mudd Building (SGM) - 101
Audiences: Everyone Is Invited
Contact: Kaela Berry
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Sonny Astani Department Seminar
Fri, May 06, 2016 @ 03:30 PM - 04:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Xin Wang, Research Institute of Disaster Science, Tohoku University, Japan
Talk Title: 1D Wave Propagation Analysis and Shear-Wave Velocity Extraction of Super High-Rise Buildings Based on Ambient Vibrations Measurement
Abstract: Shaking modes of super high-rise buildings are very complex. In the first part of this study, three 2-D frame models of super high-rise buildings including bending and shear deflections in each member are used to simulate shear-wave propagation within the building. Different shaking modes at the lower stories of the three models are designed, each with a different mass-and-rigidity distributions, such as: (i) all stories shaking in a shear-bending mode, (ii) the lower eight stories shaking in pure bending mode, and (iii) the fourth to eighth stories shaking in pure bending mode. The wave reflections at the boundaries of stories with different shaking modes are examined from the response waves and the impulse responses with respect to the response of the top. Because of the wave interference, it is difficult to observe the travel path directly from the response waves. However, the travel path and the reflected waves can be observed clearly from impulse responses. For the stories shaking in pure bending mode, similar to the models (ii) and (iii), because there is no inter-story shear deformation, the apparent shear-rigidity of these stories seems infinite, which leads to zero shear-wave travel time and shear-wave velocities cannot be extracted successfully. In the second part of this study, 1D vertical shear-wave propagation in two super high-rise buildings are identified using ambient vibration response recorded by a portable array. The identified shear-wave propagation from the impulse response, including the boundary conditions, is compared with the simulated ones. Attempt is made to identify the shear-wave velocities for the individual stories.
Biography: Dr. Xin Wang is an Assistant Professor of the Research Institute of Disaster Science of Tohoku University in Japan. Her research combines knowledge of seismology and civil engineering and aims to disaster prevention from earthquakes. Her research topics include building damage detection and building damage causes examination due to ground shaking during big earthquake disasters, e.g. the 2008 Wenchuan Earthquake in China, the 2011 Great East Japan Earthquake, and the 2014 Ludian Earthquake in China. She is currently studying damage from the recent 2016 Kumamoto Earthquake in Japan. Her main recent research topics are Structural Health Monitoring of super high-rise buildings, and earthquake response recording systems using smart devices. Native of China, Dr. Wang received her B.S. and M.S. degrees in Civil Engineering from the Dalian Jiaotong University and Southeast University, respectively, after which she moved to Japan and earned her Ph.D. degree from the Aichi Institute of Technology.
Host: Maria Todorovska
Location: Seeley G. Mudd Building (SGM) - 101
Audiences: Everyone Is Invited
Contact: Kaela Berry
