Seismic analysis of a multistory building yielding at a specified story | |
| Author | Indrawan, Daniel |
| Call Number | AIT Thesis no. 1322 |
| Subject(s) | Tall buildings Seismological research |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand |
| Publisher | Asian Institute of Technology |
| Abstract | A linearization technique is developed to obtain the statistical response of a nonlinear multistory building subjected to a nonstationary filtered shot noise earthquake excitation which is assumed to be a finite order of Markov process. The system exhibits nonlinearity due to its bilinear hysteretic restoring force-deformation relationship. The restoring force is characterized by a linear spring, a viscous damper and a Coulomb stiffness element in parallel. The study is carried out first for a MDOF system yielding at the top story by using MDOF bilinear hysteretic analysis. A Fokker-Planck equation is derived containing a nonlinear term of a product of the displacement of the mass and the Coulomb spring. An equivalent linear model is proposed by replacing the Coulomb spring by a Maxwell model, Thus the analysis involves a single coefficient characterizing this new viscous damper. For each time this coefficient is obtained by minimizing the statistical mean square error between the Fokker-Planck equation of the nonlinear model and that of the equivalent linear model. Its statistical response can be obtained by uncoupling the equations of motion by means of complex eigenvalue computer program. Then, as an alternative way, the elastic mode superposition method is adopted for determining the response level. By following exactly the same manner as in the MDOF bilinear hysteretic analysis, the response level of the system can be determined. The results of a 33-story building modelled as a 5-mass system is obtained. The response level is nonstationary. The analysis of this 33-mass system as it is by adopting elastic mode superposition gives good results. As a conclusion, the latter method is more rational and feasible to analyze the response level of a large system. In addition, the time increment in both analyses is very sensitive and small . |
| Year | 1978 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Karasudhi, Pisidhi |
| Examination Committee(s) | Tanabe, Tada-Aki ;Pichai Nimityongskul |
| Scholarship Donor(s) | The Government of The Federal Republic of Germany |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1978 |