Abstract
This study intends to verify analytically and experimentally the performance of a new type of prestressed concrete (PSC) I-girder for its application as railway bridge. Since the girder-type railway bridge develops relatively low torsional rigidity, there is risk for the dynamic responses to amplify due to the superposition of the torsional mode and flexural mode. The superposition of the torsional and flexural modes as well as the dynamic stability of the railway bridge were examined through dynamic analysis. Three-dimensional modelling was built to be suitable for carrying out moving load analysis. Four different span lengths of 30, 35, 40 and 45 m adopted considering the most applied span length currently and future lengthening of the span length. Moreover, a full-scale girder specimen with span length of 35 m was fabricated and subjected to dynamic loading. The measured dynamic responses were then compared to the analytic values. Finally, the ultimate bearing capacity of the specimen was verified by static loading test.
Highlights
Korea achieved remarkable growth of its transportation infrastructure within a very short period.The Korean government annually announces the current status of roads and railroad facilities [1,2].Figure 1 is reconstructed using current status data for roads [1] and railroad facilities [2]
The present study intends to evaluate the structural behavior of a new type of prestressed concrete (PSC) I-girder for its application to railway bridges
The new type of PSC I-girder considered in this study applies the half-slab to take full advantage of its characteristics in term of construction stability
Summary
Korea achieved remarkable growth of its transportation infrastructure within a very short period. 1950s, and the PSC I-girder became the preponderant type of superstructure after a peak in the 1960s owing to its low cost and shortened construction period. Apart from special long-span development of dedicatedofmonitoring systems as as on the evaluation of the dynamic behavior of bridges, the application the PSC I-girder as well superstructure is common in Korea for its high-speed railway bridges [6,7,8]. The present study intends to evaluate the structural behavior of a new type of PSC I-girder for its application to railway bridges.
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