孔道压浆缺陷对预应力混凝土梁耐久性的影响研究
Study on Durability of Prestressed Concrete Beams with Influence of Grouting Defects
摘要:
对具有孔道压浆缺陷的预应力混凝土缩尺梁构件进行氯盐溶液浸泡处理，而后对其进行了静载试验。探讨了压浆缺陷分布位置及侵蚀时间对梁试件的跨中挠度变形、跨中混凝土应变及裂缝发展的影响，并对预应力筋锈蚀情况进行了分析。此外，为探究空浆部分预应力筋断裂对构件承载力的影响，以试验中部分工况为基础，采用数值计算方法对足尺箱梁进行了仿真计算，研究了不同位置预应力筋断裂对构件极限抗弯承载力的影响。
Abstract:
Scaled prestressed concrete beams with duct grouting defects were immersed in chloride solu-tion, and then static loading tests are carried out on these beams. With different position of grouting defect and soaking time as variable, an attempt is made to know the laws of mid-span deflection, strain and cracking development. In the meanwhile, the corrosion of prestressed reinforcement is analyzed. In addition, in order to investigate the effect of the prestressed ten-don rupture on the bearing capacity of the voids, then based on some of the working conditions, numerical analysis of full-scale component is made to know the effect of fracture of prestressing tendon on capacity.
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