An Experimental Study on After-fracture Redundancy of Continuous Span Two-girder Bridges

作者：Park Yongmyung; Joe Woomdoji; Park Jaebong; Hwang Minoh; Choi Byung H^*

来源：International Journal of Steel Structures, 2012, 12(1): 1-13.

DOI：10.1007/s13296-012-1001-6

• redundancy
• two-girder bridge
• continuous bridge
• fractured girder
• lateral bracing

This paper presents the results of an experimental test and numerical analysis of the after-fracture redundancy of two-girder continuous span bridges. Two test specimens that are commonly composed of two steel-plate girders and concrete deck have a fractured section in one of the two girders, which is artificially set up by making an entire cut along the web and bottom flange of the girder. To demonstrate the effect of bottom lateral bracings on the after-fracture redundancy of two-girder bridge system, one of the two test specimens includes a lateral bracing system between the girder bottom flanges but the other does not. The bend-loading test was conducted on the bridge specimens up to the collapse state. The test results revealed that the ultimate bending behaviors of the bridge specimens are considerably different from each other and the load carrying capacity could be increased as much as 20% when the bottom lateral bracings are installed. The numerical analysis of the test specimens indicates that the bottom lateral bracings play a substantial role in the load redistribution process from the severely fractured girder to the intact girder, making a considerable contribution to the load-carrying capacity of the after-fracture two-girder bridges. In the last part, the after-fracture redundancy was quantitatively evaluated for a prototype example bridge and some conclusions were drawn.

• 出版日期2012-3