氯离子侵蚀环境下钢筋混凝土箱梁的弯曲行为试验研究

Experimental Study on Bending Behavior of Reinforced Concrete Box Girder Exposed to Chloride Environment

氯离子引起的钢筋锈蚀是钢筋混凝土箱梁性能劣化的主要原因之一。以氯离子对钢筋混凝土的侵蚀机理为基础,开展单室箱梁氯离子侵蚀的试验研究,制作了钢筋混凝土简支箱梁模型,主要分析了荷载作用下氯离子侵蚀对钢筋混凝土箱梁弯曲行为的影响程度。结果表明,钢筋混凝土箱梁经氯离子侵蚀并开裂后顶板处钢筋应力曲线变缓,应力增长较快,相反的底板处钢筋应力曲线变陡,应力增长较慢;通过荷载作用下腹板裂缝对比分析得出氯离子侵蚀加速了腹板裂缝的产生。

The reinforcement corrosion caused by chloride ion is one of the main reasons for the degradation of reinforced concrete box girder.Experimental study on chlorine ion corrosion of single box girder was carried out based on the corrosion mechanism of chloride ion on reinforced concrete.The model of reinforced concrete simply-supported box girder was made and the influence of chlorine ion corrosion on the bending behavior of reinforced concrete box girder was analyzed.The results show that reinforced concrete box girders are eroded by chloride ion the longitudinal reinforcement stress curve in the top plate is decreased,while the longitudinal reinforcement stress curve in the bottom plate increases.The Cracks in the girder's web plate more intensive after chloride ion corrosion,which show that the chloride ion corrosion accelerates the formation of the peritoneal cracks.The chloride ion erosion accelerates the formation of the peritoneal cracks.