The experiment on Cam-Grip energy dissipating device in hybrid precast concrete frame system | |
| Author | Mai Tu Thien |
| Call Number | AIT Thesis no.ST-16-01 |
| Subject(s) | Precast concrete construction Structural frames--Earthquake effects |
| Note | 142 leaves : ill. |
| Publisher | Asian Institute of Technology |
| Series Statement | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Abstract | Hybrid precast concrete exhibits several advantages over cast-in-place concrete and other types of precast concrete system such as reduction of residual drifts, ability to undergo large inelastic deformation with no or little structural damage, the capacity of self-centering by opening and closing of gaps between precast beams-to-precast column interfaces resulted from the posttensioned force and the ability to carry gravity force from the friction between precast members created by posttensioned tendon clamping force. However, the lateral deformation of hybrid system might still be larger than the acceptance criteria and the mild steels inside the connection region is susceptible to its buckling caused by tension-compression cyclic loading. In addition, its unknown condition to new earthquakes and replacement issue should be taken into account since mild steels are located inside beams and column. Thus, an externally installed device, which allows to be yielded under tension to dissipate energy and free under compression was introduced to replace mild steel for hybrid precast system. The device can be replaceable once being damaged. Cruciform shape of interior beam-column sub-assemblage with device installation was made and experimented for 2 main tests with 5 subtests by cyclic loading in accordance to ACI T1.1-01. There was no cracks in precast concrete members, but interface grouting. First test specimen shown good energy dissipation and stiffness stability even though one posttensioned tendon was accidentally bonded by grout in beam-to-column connection region while the other four did not. Steel cores in all tests found to be not yielded due to the unforeseen problems caused by different working mechanism with theoretical calculation and prediction. This can be improved by changing the location of the device and control its fabrication from steel factory. Last four tests shown its self-centering behaviors, and stiffness stability, however, low lateral strength, and low energy dissipation capacity due to un-yielded steel core. |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-16-01 |
| 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) | Punchet Thammarak ; |
| Examination Committee(s) | Pennung Warnitchai;Naveed Anwar; |
| Scholarship Donor(s) | Resolution Engineering Co., Ltd. Thailand ;AIT Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2016 |