Abstract

Bilateral cracking would occur at weld toes on both sides of diaphragm-to-rib welded joints in orthotropic steel decks, which severely affects the safety of bridges. Previous studies mainly focus on the crack maintenance on one side of DU, ignoring the situation of bilateral cracking. By conducting fatigue tests, the local stress characteristics of DU reinforced by steel plates on both sides were analyzed and the influence degree of adhesive quality, reinforcement methods and parameters on the reinforcement effect was clarified. The reasonable size and thickness of steel plates were recommended by numerical simulation. The results demonstrate that the interaction between cracks can be effectively reduced after simultaneously carrying out reinforcement on both side of DU. Although the stress transmission of steel plate reinforced with adhesive is better than that by bolts, the reinforcement effect is greatly affected by adhesive quality, while for the bolt connection, the local stress of the reinforced area will still maintain a safe level in a period of time after secondary cracking. The thickness of the steel plate is recommended to be 2 mm less than the diaphragm, and the reinforcement area shall be fully covering the cracks to achieve a better reinforcement effect.

中文翻译：

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正交异性钢桥面板横肋焊接接头两侧开裂后钢板的加固效果

摘要

正交异性钢桥面板横肋焊接接头两侧焊趾处会出现双边裂纹，严重影响桥梁的安全。以往的研究主要集中在DU一侧的裂纹维持，忽略了双边裂纹的情况。通过疲劳试验，分析了双面钢板加固DU的局部应力特征，明确了粘接质量、加固方法和参数对加固效果的影响程度。通过数值模拟推荐了合理的钢板尺寸和厚度。结果表明，在DU两侧同时进行加固后，可以有效减少裂缝之间的相互作用。虽然用粘合剂加固钢板的应力传递比螺栓好，但加固效果受粘合剂质量影响较大，而对于螺栓连接，加固区域的局部应力在一段时间内仍会保持在安全水平。二次开裂后的时间。钢板厚度建议比隔板薄2mm，加固面积应充分覆盖裂缝，以达到更好的加固效果。