Structural health monitoring of a multi-story hospital building by using acceleration response time histories and nonlinear updated FEM | |
| Author | Pokharel, Darshan |
| Call Number | AIT Thesis no.ST-24-16 |
| Subject(s) | Structural Health Monitoring Structural analysis (Engineering) Finite element method--Data processing Hospital buildings--Earthquake resistant design |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Structural Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | With the advancement in sensing technology, use of low-cost sensors (accelerometers) has gained massive popularity from engineers to make Structural Health Monitoring (SHM) an applicable and affordable option to a wide range of structures. The thesis presents use of low-cost Micro-Electro-Mechanical System (MEMS) accelerometer on limited number of floors of the 16-story hospital building for continuous condition assessment. The theory is simple; the recorded acceleration from the accelerometer during the earthquake is converted to modal responses with the technique known as Least Square Error (LSE) approach. Once the modal response is obtained, the floor response (floor acceleration, floor displacement, inter-story drift) of each floor, even non-instrumented ones can be computed using the interpolated 3D mode shape. Only at the linear range, real acceleration data was available from the earthquake but to verify the proposed methodology in the nonlinear range nonlinear updated FEM was used and a simulated earthquake scenario was generated.So, the concept is further extended to predict the damage to the structural components (shear walls, columns) using the non-linear Finite Element Model (FEM). Firstly, modal updating of the non-linear FEM is carried out to match the dynamic properties of the FEM with the ones obtained from field measurements. Modal coordinates time histories from the LSE approach obtained after modal decomposition of inelastic response are mapped with the nonlinear force demand vs modal coordinate relationship of each component obtained from the monotonic modal push over analysis to get the seismic demand of individual columns and shear walls at the given level of non linearity. The analysis result shows that the use of mapping technique is not only accurate when compared with the standard NLRHA procedure, but it is also very rapid which is crucial for post-earthquake damage estimation. |
| Year | 2024 |
| 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) | Pennung Warnitchai |
| Examination Committee(s) | Thanakorn Pheeraphan;Krishna, Chaitanya |
| Scholarship Donor(s) | Computer and Structures Inc. (CSI);AIT Scholarships |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2024 |