Weigh-in-motion of rail vehicles and stress measurement of a railway bridge | |
| Author | Ekarin Leangvilai |
| Call Number | AIT Thesis no.ST-02-2 |
| Subject(s) | Railroad bridges Bridges Live loads |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | The State Railway of Thailand (SRT) has a project to connect railway routes in Thailand with the railway of Malaysia. The live load design standard for railways in Malaysia is higher than the standard design for Thailand. The railway bridges in connecting route might not be able to support trains from Malaysia. Hence, inspection of southern route railway bridges was established in 2001 to evaluate their capacity. Real loading situation is important for fatigue life assessment. Weigh-in-motion system was introduced to measure the real loading situation. Shearing strain in rails was used as structural response for weigh-in-motion analysis. Weigh-in-motion system was designed and tested in the laboratory before being applied in situ. The system was tested by static and dynamic loads on site to confirm its performance. Then, the systems were applied to measure train loads. The results of measurements showed that the highest axle load was gen~rated by freight car. Large portion of axle loads exceeds 16 tons, which is current design live load of SRT for bridge inspection, retrofitting and strengthening. A higher load standard is preferable for the design of new structures and existing structural assessments. This train weight measurement was carried out coupled with stress measurement of a railway bridge. By combining these two informations, train loads and dynamic stress histories, a simplified but accurate method to estimate train-induced stresses in railway bridges could be developed. The simplified model will be a powerful tool for evaluating a large number of bridges. A railway bridge in Ayutthaya Province was tested. The results of dynamic tests indicated that stresses in bridge members were dominated by quasi-static stresses. Dynamic effect is low and can be neglected. Stresses in bridge components under train loads were calculated by static analysis and compared to the measured stresses. Rails were modeled as continuous beams on an elastic support. Axle loads are distributed tlu-ough many ties and act on the bridge structure. A simply supp01ted beam is reasonable model for stringers, floor beams and main girders. |
| Year | 2002 |
| 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) | Pennung Warnitchai; |
| Examination Committee(s) | Worsak Kanok-Nukulchai;Bany, William J.;Kidu, Kim; |
| Scholarship Donor(s) | Royal Thai Government Scholarship (R TG); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 200 |