Yuta FURUKAWA
Study on cracking resistance and deformability on a three-layered buried join
Osamu TAKAHASHI
A buried joint is constructed at an edge portion of bridge deck as a part of bridge pavements in order to disperse and absorb stress and strain caused by thermal displacement of the bridge edge. The dispersion type of buried joint has a grid panel in binder course as reinforcement and sliding sheets under the binder course. Major failure form of the buried joint is transverse cracking at the edge part. It is caused from contraction of the main girder toward bridge axial direction due to temperature changes. This study discusses the buried joint comprised of three layers of surface course, binder course and composite course containing the grid panel. Therefore cracking resistance of the buried joint deeply depends on the contraction efficiencies of surface course and binder course. This study evaluated cracking resistance efficiency of the three-layered buried joint based on Direct tensile test of each the layers and Real Specimen test. One Real Specimen test was conducted using Base layer. The results of Stretch performance test, it was confirmed to widely dispersed strainĄ„Also exhibit sufficient performance even when repeatedly tested. Next, Direct tensile test was carried out. It was performed test temperature control and strain rate in each layer. As a result, fracture strain was confirmed that does not vary with strain rate From this, fracture strain of the actual structure and the Laboratory test is considered the same degree. Further, the results of comparison of fracture strain and previous studies, three-layer buried joints are considered to have applicability.
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