灌芯加固预应力混凝土空心楼板抗弯性能试验研究

摘要

To learn the flexural capacity of pre-stressed reinforced concrete(RC)hollow core slabs strengthened by grouting and study cracking load,ultimate bearing capacity and deflection in across of the slabs with different reinforced positions of the same materials,6 specimens were experimentally studied, including 3 damaged hollow slabs,3 undamaged and 2 unreinforced ones.By grouting the pre-stressed RC hollow core slabs and vibrating on the top,the mentioned performance of RC hollow slabs was studied. Results showed that after being reinforced,the cracking loads of hollow slabs increased by 148%,while the average ultimate bearing capacity increased by 100%.The deflection in across increased by 270%. Comparing with the specification,the performance could reach to the normal state while the ability could meet the requirements of the design and construction well.%为了研究灌芯加固后混凝土空心楼板抗弯性能,比较使用相同材料不同位置加固混凝土空心楼板的开裂荷载、极限承载力、跨中挠度,试验制作了6块预应力混凝土空心板试件,其中3块为未破损空心板,3块为有破损加固空心板,另取2块未加固空心板做对照,通过灌芯加固混凝土空心楼板及振动机板顶振捣,研究加固后混凝土空心楼板上述各项性能.研究结果表明:加固后空心板开裂荷载均值提高幅度为148%,极限承载力均值提高幅度为100%且跨中挠度均值提高幅度为270%.与规范相比较,各项性能均能达到正常使用状态,并能够较好地满足设计及施工要求.