An experimental investigation of precast segmental column with post-tensioning tendons under static axial and bending load | |
| Author | Jeeradej Viratchai |
| Call Number | AIT Thesis no.ST-00-23 |
| Subject(s) | Columns, Concrete Prestressed concrete construction |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Segmental prestressed concrete (PC) is a new construction technique which is well-applied for highway bridge technology recently introduced for use in highway bridge to meet the requirement of construction time savings, cost-effectiveness and simplicity of construction, with minimum interference to the current traffic. In this study, the idea to apply the segmental technique for a column element is proposed. The investigation of structural behavior and load carrying capacity of precast segmental PC column with internal unbonded tendons is conducted. The experiment *. The effects of the prestressing force on the load carrying capacity were investigated as the main parameter. By adopting the fundamental assumptions for flexural and compression members, a nonlinear numerical analysis was established to predict the load-response behavior of the segmental PC column throughout loading until the ultimate state. Finally, a parametric study was done by changing the various parameters to investigate the effect of the concerned parameters on the ultimate strength of the segmental PC column. From test results, it was shown that when segmental PC columns were subjected to load beyond the joint opening, it had a significant plastic deformation occurring after unloading. However, the stiffness of segmental PC column was almost the same as that of the initial state. The prestressing force was proven to have significant effects on the structural performance of segmental PC columns. It was observed that with the different but the same prestressing force, load carrying capacity of the segmental PC columns is almost the same. From numerical analysis, the acceptable agreement with the test results for prediction a load-response behavior of segmental PC column is obtained. By changing the prestressing force in a numerical calculation, load carrying capacity of segmental PC column is widely varied. The optimum ratio of stress by prestressing force to concrete compressive strength to achieve large bending moment and vertical load capacity is found to be 0.08. The effective vertical load, which is corresponding to the optimum condition, is found to be 0.40-0.45 of concrete compressive strength. However, the bending moment capacity can not exceed a value, which is the limitation bending moment of that cross section. It was also found that the maximum bending moment of segmental PC column is 28% less than that of ordinary RC column with 1% steel. |
| Year | 2000 |
| 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) | Songkiat Matupayont; |
| Examination Committee(s) | Worsak Kanok-nukulchai ;Pennung Warnitchai; |
| Scholarship Donor(s) | Asian Institute of Technology (Partial Scholarship) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |