Seismic response assessment of block-type building contents in tall buildings | |
| Author | Natthapong Nima |
| Call Number | AIT Thesis no.ST-20-08 |
| Subject(s) | Earthquake hazard analysis Buildings--Earthquake effects Motion |
| 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-20-08 |
| Abstract | The primary response modes of rigid block-type freestanding building contents when subjected to the earthquake are sliding and rocking. However, the most damaging response mode is rocking due to its possibility of overturning. This study experimentally and analytically examines the rocking behavior of typical building content located at different floor levels in a high-rise building. The numerical model used was based on the governing equation of rocking motion established by Housner G. (1963). This governing equation is widely used and well known in the literature. In this study, a computer program was written to solve the available governing equation and was used to predict the rocking and overturning behavior of rigid rectangular building contents under horizontal acceleration. The accuracy of the computer program was checked by comparing its results with the analytical results proposed by Makris and Roussos (1998). This comparison shows that our computer program is accurate enough and can be used in further analysis. To verify the reliability of the computer program, experimental tests were conducted on a 1.0×1.2 m uni-axial shaking table at Asian Institute of Technology, Bangkok. The conventional filling cabinet with a slenderness ratio (B/H) of 0.35 and bookshelf with a slenderness ratio (B/H) of 0.13 were selected as the test specimens used in this study. The comparisons between the experimental and numerical results under a total of 156 ground and floor motions were made, and an acceptable agreement was found between these two. By applying the computer program, the rocking and overturning behaviors of typical building contents with sizing parameter (R) ranging from 0.5-2.0 m. and slenderness ratios of 10°- 20° were examined under the floor accelerations of a case study building. The coefficient of restitution was varied to see its effect on the rocking response. The universal fragility curves for several limit states (LSs) were created in this study by using the normalized peak angle of rotation as the demand parameter and a physically motivated intensity measure based on the PFV, block size and slenderness. The propose of developing these fragility curves was to improve the method of estimation of the damage of the building contents against future earthquakes. One of the main findings of this paper is that when comparing the rocking responses in term of fragility curves, the typical building contents are more vulnerable to the characteristic of ground motion (wide-band excitation) rather than characteristic of floor motion in a high-rise building (narrow-band excitation). |
| Year | 2020 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-20-08 |
| 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) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2020 |