TRAN LE PHUOC TAN
Study on the impact factor for static Redundancy analysis of the truss bridge
Eiji Iwasaki
Construction infrastructure in Japan, because it was built in large quantities in the period of high economic growth, has become many problems associated with the deterioration of the foundation structure. In 2006, diagonal members of the Kiso Bridge and Honjo Bridge was broken by corrosion. However, these did not reach to the bridge collapse. As in this cases, even when the part of the bridge is broken, there is a case that the bridge does not lead to collapse. This is because section force of the breaking member is borne by the other member, it was greater as compared to the case where the margin of the whole structure was broken. Analysis has been carried out to clarify this difference in recent years, in the analysis, because breakage of the bridge member is dynamic, is a dynamic analysis is the best method for analyzing the structure member. However, dynamic analysis is very complex, not a suitable solution for the application of the actual dynamic analysis. Therefore, static method of using an alternative load was enlarge ¦Á factor in breaking the diagonal member is often used. It should be noted, ¦Á coefficient that is used in order to expand the load has been referred to as the shock factor, by the URS report et al., the impact factor 1.854 is applied to model one degree of freedom. However, by Goto et al., the impact factor may vary. It is considered that it should be considered a multi degree of freedom model. Therefore, in this study, we assume that the three cases of Miomote Bridge and three cases of Takayanagi Bridge was broken and then conducted to calculate the ¦Á shock factor in the multi degree of freedom model. FCM is in many cases the tension member, this cases represent the most types the scenario of fracture that occurs in the member having a tension
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