Seismic behaviour of post-tensioned precast beam-column connection with elastic-perfectly-plastic energy dissipative device | |
| Author | Sendanayake, Sukhi Vanessa |
| Call Number | AIT Caps. Proj. no.CIE-15-32 |
| Subject(s) | Earthquake resistant design Precast concrete Columns, Concrete |
| Note | A capstone project report submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Engineering Civil And Infrastructure Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Caps. Proj. ; no. CIE-15-32 |
| Abstract | Precast structures are ideal for developing countries that seek fast and effective construction methods while preserving the quality and performance of a structure. However, precast structures display signs of weakness when subjected to seismic loading. The damage mainly occurs at the precast beam-column joints which do not form plastic hinges under cyclic loading as their monolithic equivalents do, and so dissipate less amounts of energy during seismic vibrations. This study focuses on the behavior of a post-tensioned beam-column connection with an external energy dissipative device subjected to cyclic loading. Such connections combine the re-centering capacities of post-tensioning and the high levels of energy dissipation from external energy dissipating devices to maximize structural safety during an earthquake. The energy is dissipated by the yielding of a mild steel bar installed externally at the connection with a gripping device. After an earthquake, this can be removed and re placed. Experimental results demonstrates that the post-tensioned connection has the ability to re-center when the load imposed on it is removed. Rocking movement of the column was observed. Residual displacements when the drift is 0% was also zero or negligible, re confirming that the connection can re-center. The post-tensioning strand does not yield under the given load. Numerical analysis show that the presence of the sacrificial mild steel bar greatly increases the energy dissipating capacity of the post-tensioned connection. A flag shaped hysteresis curve is observed and re-centering with minimal residual displacements is observed. It can be concluded that this type of connection will have minimal damages and can be retrofitted quickly and economically. |
| Year | 2015 |
| Corresponding Series Added Entry | Asian Institute of Technology. Caps. Proj. ; no. CIE-15-32 |
| Type | Capstone Project |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Civil and Infrastructure Engineering (CIE) |
| Chairperson(s) | Punchet Thammarak; |
| Examination Committee(s) | Teraphan Ornthammarath; |
| Degree | Capstone Project (B.Sc.)-Asian Institute of Technology, 2015 |