| Author | Chaiyapruek Panitchayangkul |
| Call Number | AIT Thesis no.ST-18-25 |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-18-25 |
| Abstract | The health monitoring of horizontal load resisting structures is essential for the damage detection and the safety evaluation of high-rise buildings in the earthquake-prone areas. The widely-used monitoring technique is conducted by means of floor acceleration response measurement by accelerometers along with signal processing and vibration data interpretation in frequency domain. Predominant frequencies and mode shapes have been used as the indicators for damage detection. However, these indicators can also be affected by some ambient conditions, e.g. temperature and directions of solar exposure onto a building. Furthermore, small damages could hardly be identified by acceleration-based techniques. Thus, the detection of non-severe damages could not be precise. There were some efforts to use modal strains, stemmed from dynamic strain measurement, for damage detection instead of acceleration-based techniques due to its superior performance. However, those studies were conducted in scaled models, and the forced excitation was higher which made general resolution strain measurement (1 micro strain resolution) possible. In this research, we explored techniques to construct the modal strain signatures in a real 26-story building. The resolution of measurement was enhanced by the use of piezo-resistive type strain gauges, applied on the predetermined high-strain locations on the concrete surface of structural walls. The forced excitations, generated by humans, synchronized by a metronome, were applied at the first fundamental frequencies in each vibration mode of the building, determined from ambient acceleration measurement. The modal strain signatures were constructed successfully from this framework, and good agreements with results from the modal analysis by FEM were observed. The actual implementation in real buildings is viable and justified by this work |
| Year | 2018 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-18-25 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Punchet Thammarak; |
| Examination Committee(s) | Pennung Warnitchai;Raktipong Sahamitmongkol; |
| Scholarship Donor(s) | Thailand (HM King); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2018 |