In-structure shock assessment and mitigation of structures
This thesis deals with soil-structure interaction effect and structural response analysis, in-structure shock assessment, and shock wave mitigation when a structure is subjected to a blast load. Dynamic media-structure interaction is analytically discussed in the background of an underground structu...
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| Format: | Thesis |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/49983 |
| _version_ | 1826116249625559040 |
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| author | Zhou, Hongyuan |
| author2 | Ma Guowei |
| author_facet | Ma Guowei Zhou, Hongyuan |
| author_sort | Zhou, Hongyuan |
| collection | NTU |
| description | This thesis deals with soil-structure interaction effect and structural response analysis, in-structure shock assessment, and shock wave mitigation when a structure is subjected to a blast load. Dynamic media-structure interaction is analytically discussed in the background of an underground structure subjected to a soil-transmitted dynamic load, in which an interfacial damping is incorporated to represent the dynamic soil-structure interaction. The effects of the interaction are analyzed and the aspects affecting the interaction are discussed. With this soil-structure interaction, in-structure shock of a typical underground structure subjected to a soil-transmitted blast load induced by a subsurface detonation is analyzed with a simplified beam model and a rigid-body-motion included plate model, respectively. With acceleration time history of the derived structural member as excitation, shock response spectra are established to assess the in-structure shock level of the equipment attached to the buried structure. To mitigate the in-structure shock, a new design of underground structures is proposed by adding an isolation slab inside the structure. The excitation mechanism for the equipment within the structure is altered and the vertical shock level is effectively reduced. In addition, in-structure shock induced by a soil blast with non-zero rise time is also analyzed. A small scale test is designed and conducted to validate the prediction. Tests results indicate that the predictions are favorably comparable with the experiment. When subjected to a close range spherical airburst, the response of a blast mitigation cladding with metal foam core is determined by energy method. Shock theory and rigid-perfectly-plastic-locking model is adopted to obtain the response of metal foam under high velocity crushing. This prediction has practical significance since it delineates the situation of a cladding subjected to a close range detonation event with realistic boundary. Further, density gradient metal foam as core of a blast mitigation cladding is theoretically investigated with shock theory and rigid-perfectly-plastic-locking model. |
| first_indexed | 2024-10-01T04:07:56Z |
| format | Thesis |
| id | ntu-10356/49983 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:07:56Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/499832023-03-03T19:15:19Z In-structure shock assessment and mitigation of structures Zhou, Hongyuan Ma Guowei Lim Chee Hiong Zhao Zhiye School of Civil and Environmental Engineering Protective Technology Research Centre DRNTU::Engineering::Civil engineering::Structures and design This thesis deals with soil-structure interaction effect and structural response analysis, in-structure shock assessment, and shock wave mitigation when a structure is subjected to a blast load. Dynamic media-structure interaction is analytically discussed in the background of an underground structure subjected to a soil-transmitted dynamic load, in which an interfacial damping is incorporated to represent the dynamic soil-structure interaction. The effects of the interaction are analyzed and the aspects affecting the interaction are discussed. With this soil-structure interaction, in-structure shock of a typical underground structure subjected to a soil-transmitted blast load induced by a subsurface detonation is analyzed with a simplified beam model and a rigid-body-motion included plate model, respectively. With acceleration time history of the derived structural member as excitation, shock response spectra are established to assess the in-structure shock level of the equipment attached to the buried structure. To mitigate the in-structure shock, a new design of underground structures is proposed by adding an isolation slab inside the structure. The excitation mechanism for the equipment within the structure is altered and the vertical shock level is effectively reduced. In addition, in-structure shock induced by a soil blast with non-zero rise time is also analyzed. A small scale test is designed and conducted to validate the prediction. Tests results indicate that the predictions are favorably comparable with the experiment. When subjected to a close range spherical airburst, the response of a blast mitigation cladding with metal foam core is determined by energy method. Shock theory and rigid-perfectly-plastic-locking model is adopted to obtain the response of metal foam under high velocity crushing. This prediction has practical significance since it delineates the situation of a cladding subjected to a close range detonation event with realistic boundary. Further, density gradient metal foam as core of a blast mitigation cladding is theoretically investigated with shock theory and rigid-perfectly-plastic-locking model. Doctor of Philosophy (CEE) 2012-05-28T04:20:45Z 2012-05-28T04:20:45Z 2012 2012 Thesis Zhou, H. Y. (2012). In-structure shock assessment and mitigation of structures. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/49983 10.32657/10356/49983 en 222 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Civil engineering::Structures and design Zhou, Hongyuan In-structure shock assessment and mitigation of structures |
| title | In-structure shock assessment and mitigation of structures |
| title_full | In-structure shock assessment and mitigation of structures |
| title_fullStr | In-structure shock assessment and mitigation of structures |
| title_full_unstemmed | In-structure shock assessment and mitigation of structures |
| title_short | In-structure shock assessment and mitigation of structures |
| title_sort | in structure shock assessment and mitigation of structures |
| topic | DRNTU::Engineering::Civil engineering::Structures and design |
| url | https://hdl.handle.net/10356/49983 |
| work_keys_str_mv | AT zhouhongyuan instructureshockassessmentandmitigationofstructures |