| Author | Anun Patjawit |
| Call Number | AIT Diss. no.ST-05-01 |
| Subject(s) | Bridges, Concrete
|
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. ST-05-01 |
| Abstract | A research study for developing a procedure for monitoring structural condition of bridge structures, which eventually provides essential information used for bridge rating, has been conducted. The study has been aimed for achieving a monitoring method that is relatively simple, convenient for use, economical and less time-consuming, but can yield reliable results. Impact testing and finite element techniques have been selected as the principal tools for acquiring dynamic characteristics of the structures to be studied. After its successful application on idealized structures as structural steel and reinforced concrete beams in laboratory, impact testing has been conducted on the prestressed concrete bridge located in the provinces of central Thailand. The critical dynamic responses of the bridge collected during the testing process were mode shape, natural frequency and flexibility matrix norm. Next, finite-element analytical model was developed for the tested bridge and eigenvalue analysis was then performed. Calibration of input data for the analytical model was also incorporated in the analysis so that the structural responses comparable to that obtained from the field test were resulted. By performing truckload testing on the bridge, the developed finite element model was proved capable of yielding accurate structural responses under static loads as well. The results from these finite element analyses were then used in bridge rating procedure. The test bridges appeared to be in good condition according to their rating results. In addition, the flexibility matrix norm, one of the critical structural parameters introduced and studied along the way, was found to be the more effective indicator for monitoring the structural condition of bridge structures compared to mode shape and natural frequency. This is due to its relatively high sensitivity to structural damage or deterioration. Therefore, continual monitoring the values of flexibility matrix norm can provide for bridge engineers the guideline when rigorous bridge inspection shall be performed. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. ST-05-01 |
| Type | Dissertation |
| 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; |
| Examination Committee(s) | Ogunlana, Stephen 0.;Huynh Ngoc Phien;Barry, William J.;Loo, Yew-Chaye; |
| Scholarship Donor(s) | Royal Thai Government; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2005 |