Nonlinear dynamic analysis of gravity load designed reinforced concrete buildings with soft story for seismic performance evaluation | |
| Author | Saw Marlar |
| Call Number | AIT Thesis no.ST-08-03 |
| Subject(s) | Buildings, Reinforced concrete--Earthquake effects Earthquake resistance design |
| Note | A thesis submitted in partial fulfillment of the re quirements 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-08-03 |
| Abstract | Configuration irregularities is one of the main characteristics of gravity load designed structures which reduce the seismic resistance. To evaluate the seismic performance of buildings, this factor should be taken into account. Configuration irregularity is defined as a significant physical discontinuity in the building configuration or in the lateral force resisting structural system. Irregularities both in terms of geometry and structural properties (i.e. strength and stiffness) are commonly found in gravity load designed structures. Buildings with irregular configurations were more vulnerable than the regular buildings in recent earthquakes. The most advanced level of analysis available to the designer for the purpose of predicting design forces and displacements under seismic attack is nonlinear dynamic time-history analysis. The main objective of this study is to investigate the seismic performance of GLD reinforced concrete frame buildings with soft-story configuration by nonlinear dynamic approach. The effect of greater height and fewer amounts of infill walls than the upper ones are considered in this study. The NLD analyses of the gravity load designed reinforced concrete moment resisting frames are conducted by using the proposed models developed from Matrin, 2007. A four-storey which includes 3 typical storeys and I mezzanine is selected to evaluate seismic performance of gravity load designed reinforced concrete building with soft-storey configuration. The four different regular and irregular types are used in this study. The seismic responses of all these frame structures are assessed by push-over analysis method, nonlinear dynamic analysis method and incremental nonlinear dynamic analysis method. The result obtained from pushover analysis is expressed in the form of the relationship of roof drift and base shear coefficient. The failure mechanism of each frame is determined by incremental nonlinear dynamic method. And storey shear demand and storey drift demand are obtained from nonlinear dynamic method. The nonlinear dynamic analysis results of storey drift distributions are very sensitive to reduction in strength and stiffness. The effects of infill wall and the effect of irregularity in height significantly dominate the storey drift distribution. The failure mechanism result shows that the brittle failure mode significantly reduces lateral load carrying capacity and ductility of structures. These analysis results are important for seismic resistance design of new buildings and retrofitting existing one. |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-08-03 |
| 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) | Widjaja, Joko Harsono;Kawin Worakanchana |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2008 |