Energy dissipater for post-tensioned steel frame system | |
| Author | Wanniarachchi, Wanniarachchige Don C.R. |
| Call Number | AIT Caps. Proj. no.CIE-16-30 |
| Subject(s) | Post-tensioned prestressed concrete Steel framing (Building)--Earthquake effects |
| 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-16-30 |
| Abstract | Following the Northridge earthquake in 1994, connection failures were found in steel mo- ment resisting structures with welded connections. Brittle fractures initiated within the con- nections at a low level of plastic demand lead to the development of improved welded con- nections focusing on the rotational ductile capacity. However due to the limitation of these connections, steel moment-resisting frames with post-tensioned strands, which are capable of providing adequate stiffness, ductility and strength during a seismic event are introduced. PT high strength strands running parallel to the beam eliminate the permanent deformation in the MRF. In this paper, Compression Free Device (Cam-Grip) is introduced as the energy dissipating device for the post-tensioned moment resisting frames. The CFD device with two major components, sacrificial steel rod and grip is designed with the mechanism of dissipat- ing energy only in tension yielding and free movement during compression to prevent buck- ling of the steel rod. In this study, detailed shell models of PT beam-column connection, PT connection with CFD and welded moment resisting connection are developed and analyzed under cyclic loading using SAP2000. Two CFDs fixed on each face of the column flange is modelled using multi-linear plastic link elements. The nonlinear-dynamic (Non Linear Time History Analysis) and non-linear static (pushover) analyses were used to compare the behaviour of three models on the basis of energy dissipation, displacement and hysteresis. Time history analysis results indicate that the PT connection with CFD exceeds the seismic performance of a welded moment-resisting connection subject to same earthquake. It was discovered that CFD was successful in dissipating energy during a seismic event event its energy dissipating capacity was not satisfactory. |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Caps. Proj. ; no. CIE-16-30 |
| 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) | Hathairat Maneetes; |
| Degree | Capstone Project (B.Sc.)-Asian Institute of Technology, 2016 |