Weigh-in-motion analysis and fatigue assessment of a steel overpass bridge under normal traffic conditions in Bangkok | |
| Author | Anon Chamchuenwong |
| Call Number | AIT Thesis no. ST-98-16 |
| Subject(s) | Elevated highways--Thailand--Bangkok Bridges--Thailand--Bangkok--Live loads Bridges, Iron and steel--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Fatigue is an important consideration in the design and analysis of steel bridge structures. Multiple passages of heavy vehicles can lead to cracking and premature failure. In Thailand, due to the lack of own proper design codes, many highway steel bridges in Bangkok might have been designed by adopting foreign design codes to consider the fatigue criteria. The foreign design codes are generally developed based on the traffic loading conditions in their countries. They may not be suitable for the traffic loading conditions in Bangkok. By this reason, in this study, the traffic loading conditions and their effects on fatigue damage in an existing steel overpass bridge in Bangkok have been investigated. Field measurements were conducted on the bridge. Strain histories were collected continuously at critical locations for a one-week period. Traffic conditions were also monitored by a video recording system. From these data, the gross weight distribution of heavy vehicles was determined by employing a weigh-in-motion analysis. A large number of vehicle weights exceeding the legal weight limit were found from this analysis. The approach based on experimental data (S-N curve) was employed to evaluate the fatigue damage of the bridge. The correlation between the fatigue damage and the traffic conditions were then identified. The results show that the fatigue damage of the bridge is significantly influenced by the extreme tail of the gross weight distribution. They also indicate that the vehicle type which has the highest contribution in term of fatigue damage of this bridge is 10-wheel truck. Finally, the fatigue vehicle model was developed. Ten-wheel truck with gross weight of 16.72 tons was proposed as the fatigue vehicle model. The dynamic amplification factors (DAFs) were also extracted from the measurement results. The average value of DAF of 0.105 was proposed for fatigue damage consideration. It is anticipated that many proposed parameters from this study will be valuable information in the future development of fatigue design code of bridge in Bangkok. |
| Year | 1998 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai; |
| Examination Committee(s) | Worsak Kanok-Nukulchai;Wijeyewickrema, Anil C.;Taweep Chaisomphob; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |