Nonlinear modeling of gravity load designed reinforced concrete buildings for seismic performance evaluation | |
| Author | Matrin Suthasit |
| Call Number | AIT Thesis no.ST-07-6 |
| Subject(s) | Buildings, Reinforced concrete--Earthquake effects--Evaluation Reinforced concrete construction--Models |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | One of the fundamental roles in earthquake engineering is to mitigate seismic risk from damage and collapse of buildings. To accomplish this, computational tools for estimating responses of buildings subjected to earthquake ground motions are required. In earthquake resistant design reinforced concrete buildings, seismic energy is intentionally dissipated through development of plastic hinges in beams. Due to existence of strong theoretical foundations in flexural behavior of structures, an accurate estimation of responses for these buildings can be obtained using quite simple and straightforward structural modeling techniques. On the other hand, seismic behavior of buildings those designed without modern seismic design theory, gravity load designed buildings, are highly complex due to various inherent non-ductile modes of failure, in which flexural theory can not be directly applied or even not applicable. To be more comprehend in such behavior, many researchers have conducted related experimental studies. Those researches provide huge amount of useful information in modeling of the later type of reinforced concrete buildings. With these information available, the most powerful analysis tool, finite element analysis, is successfully used in modeling of single reinforced concrete members. Nevertheless, when the problem becomes much larger, nonlinear dynamic analysis of structures subjected to ground accelerations, such approach is not practical. To be able to obtain accurate responses of buildings from nonlinear dynamic analysis, the main focus of this study is to develop simple analytical models for gravity load designed reinforced concrete members which are able to capture significant phenomena found during experimental studies while less computational effort is required compared to finite element analysis. In addition, the models, specifically column model and beam-column joint model, are constructed based on macro-phenomenological behavior of structures. As a consequence, results obtained from using these models would directly provided analysts engineering demand parameters necessary for seismic performance evaluation. After development of the models, verifications are done by comparing experimentally obtained responses of reinforced concrete members with those obtained using the proposed analytical models. In an average sense, it can be concluded that the models work properly and quite accurately. Nevertheless, some deficiencies of the models do exist especially in modeling of shear response in columns. Finally, to demonstrate the applicability of this model in seismic performance evaluation of gravity load designed building structures, an example analysis case is conducted. A simplified six-story reinforced concrete moment resisting frame building is selected for this purpose. By assuming boundary conditions to each structural member as usually done in experiments, seismic behavior of isolated beams, columns, and beam-column joint are evaluated. It is found that the selected building has potential of both ductile and non-ductile failure in every members and joints. By conducting push-over analysis and nonlinear dynamic analysis of the building subjected to a recorded ground motion, it can be shown that such potential modes of failure significantly reduce performance of the structure. Without this kind of computational tools developed in this study, obtaining accurate time-history responses of gravity load designed reinforced concrete buildings subjected to earthquake excitation would be impractical. |
| Year | 2007 |
| 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) | Raktipong Sahamitmongkol;Kato, Yoshitaka; |
| Scholarship Donor(s) | RTG Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2007 |