An experimental study on structural damage identification using measured acceleration data | |
| Author | Regmi, Abhishek |
| Call Number | AIT Thesis no.ST-21-12 |
| Subject(s) | Seismic prospecting Structural health monitoring Acceleration (Mechanics)--Measurement |
| 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-21-12 |
| Abstract | After the occurrence of any seismic event, the structures may undergo different levels of damage. From the past earthquake scenarios, it is seen that after any earthquake event people feel insecure to return to their residence, and also it has been a very difficult job to identify the damage in the structural system just after an earthquake. So, a rapid, as well as accurate method of identifying the seismic damage, is needed. For this, installing the acceleration sensors in the buildings to immediately know its response after the earthquake is an easy, effective, and convenient way. Different studies in the past have been carried out to estimate the seismic responses using those measured acceleration data, but those studies are only based on the study of the numerical model. This research focuses on experimentally testing the approach of using the measured acceleration data to estimate the overall seismic responses as well as the structural damage. The MDOF system was tested under different ground motions simulated using the shake table. First of all, the modal accelerations and the modal coordinates were extracted from the measured acceleration signals obtained from the acceleration transducers attached at different floor levels of the physical model fabricated in the lab, and then those modal coordinates were used for estimating the responses such as floor displacement, floor acceleration, inter-story drift, bending moment, shear force as well as strain related to bending and shear. Also, the strain gauges were attached to the specimen to monitor the strain during the vibration which was later used for comparing the strain obtained from the approach that was used. The results related to overall seismic responses computed using the approach tested in this research were found to be accurate, which was confirmed by comparing the strain results with those obtained from the strain gauges attached to the test model. This approach was able to estimate the responses quite accurately than the MRHA approach done by taking the best updated numerical model. Thus, from this study, it can be concluded that this approach of using the measured acceleration data can be a rapid and accurate way of estimating the overall seismic responses as well as the damage in the structural system. |
| Year | 2021 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-21-12 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai; |
| Examination Committee(s) | Punchet Thammarak;Thanakorn Pheeraphan; |
| Scholarship Donor(s) | AIT Alumni SEC’88 Fellowship;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2021 |