RETROFIT EFFECT OF SFRC OVERLAY ON FATIGUE DURABILITY OF ORTHOTROPIC STEEL DECKS WITH CRACKS EXTENDING TO DECK PLATE

J. Murakoshi, T. Mori, Sanshiro Haba, S. Ono, Ayumu Sato, Minoru Takahashi
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引用次数: 1

Abstract

Since around 2000, a lot of fatigue cracks propagating into deck plate have been detected in existing orthotropic steel deck (OSD) bridges. The cause of the cracks is mainly due to out-of-plane bending of 12mm thickness deck plate. As an effective measure against those cracks, steel-fiber reinforced concrete (SFRC) overlays have been used for many existing damaged OSDs. It has been confirmed that they can drastically decrease the out-of-plane deformation of the deck plate and greatly reduce the local stress of the weld route portion where the cracks initiate. However, the effect of the SFRC overlay under the existence of deck crack inside the deck plate has not been clarified. In this paper, for the purpose of evaluating the retrofit perfor-mance under existing deck cracks, fatigue tests of the OSD specimens with pre-cracking inside the deck plates were carried out under SFRC overlay. Also, local stresses and stress intensity factors were analyzed by FEA, and effectiveness of SFRC overlay was assessed from the viewpoint of preventing the deck cracks from progressing.
SFRC加铺层对裂缝延伸至甲板的正交各向异性钢甲板疲劳耐久性的影响
自2000年左右以来,在既有正交各向异性钢桥面(OSD)桥梁中发现了大量扩展到桥面板的疲劳裂纹。裂缝产生的主要原因是12mm厚的桥面板面外弯曲。钢纤维混凝土(SFRC)覆盖层作为一种有效的抗裂缝措施,已被广泛应用于现有的许多破损的油井上。试验结果表明,它们能显著降低甲板板的面外变形,大大降低裂纹产生处焊缝路径部分的局部应力。然而,在桥板内部存在桥面裂缝的情况下,钢纤维混凝土加铺层的作用尚未得到明确。本文为评价现有桥面裂缝下的改造性能,对桥板内部预裂的OSD试件进行了SFRC加铺层下的疲劳试验。通过有限元分析分析了局部应力和应力强度因子,并从防止桥面裂缝扩大的角度评价了钢纤维混凝土加铺层的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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