An experimental investigation on precast segmental composite column with post-tensioning tendons under static axial and bending load | |
| Author | Pariwat Mekasatheankul |
| Call Number | AIT Thesis no. ST-03-26 |
| Subject(s) | Precast concrete Dead loads (Mechanics) Axial loads Prestressed concrete |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-03-26 |
| Abstract | Segmental prestressed concrete (PC) is a new construction technique which is wellapplied for highway bridge-technology recently introduced for use in highway bridge to meet the requirement of construction timesaving, cost-effectiveness and simplicity of construction, with minimum interference to the current traffic. Previously, the experimental investigation of precast segmental column with unbonded post-tensioning tendons was presented. It can be concluded that for the same cross section, the segmental PC column with internal unbonded tendons is weaker than the ordinary RC column for 28% of load carrying capacity. Thus, precast segmental composite column with post-tensioned tendons is the alternative way to increase load carrying capacity of precast segmental prestressed columns. 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 composite column with internal bonded tendons is conducted. The effects of the precast area and prestressing force on the load carrying capacity were investigated as the main parameters. By adopting the fundamental assumptions for flexural and compression members, a nonlinear analytical model was established to predict the load-response behavior of the precast segmental composite 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 precast segmental composite column. From test results, it was shown that at initial state of loading, the load-deflection curve of precast segmental composite column is almost linear until the joint opening of precast segmental composite column takes place. Afterwards, the load-deflection curve is starting to be non-linear. The prestressing forces in assembly of the precast segment have slightly effect to the load carrying capacity of column. The test specimen with thicker wall of hollowed precast segment showed a lower load carrying capacity caused by the spalling of precast portion a part from the core concrete RC section. It is possibly explained by lacking of reinforcement and confinement in precast segment portion. Higher level of initial stress in prestressing wire leads to the high possibility of yielding in prestressing wire which results to the lower load carrying capacity of precast segmental composite column. The results from the analytical model give an acceptable comparison to the test observation. Furthermore, the parametric study using the developed analytical program was carried out to achieve the appropriate condition of influence parameters in obtaining the maximum load carrying capacity. It was found that the suitable cross section of precast segmental composite column shall be selected in such a way that the total compressive stress due to the vertical axial force is in the range of 0.30-0.40fc' and initial compression stress in precast section induced by the assembling force to form the precast segmental composite column. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-03-26 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Worsak Kanok-nukulchai;Songkiat Matupayont; |
| Examination Committee(s) | Pennung Warnitchai; |
| Scholarship Donor(s) | Asian Institute of Technology;Partial Scholarship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2003 |