再生骨料混凝土板冲切性能试验

Test on Punching Behavior of Recycled Aggregate Concrete Slabs

摘要:

以再生粗骨料取代率为主要参数，进行了再生混凝土板的冲切试验，分析了板在冲切荷载作用点处的荷载中心点挠度曲线、板底钢筋应变、板顶混凝土应变、破坏形态及受冲切极限承载力等.分析结果表明：随着再生粗骨料取代率的提高，板在各个受力阶段的变形性能和受冲切承载力均有所降低.基于试验结果，对普通混凝土板受冲切极限承载力计算公式进行了修正，建立了再生混凝土板受冲切极限承载力计算公式并进行了校核，结果可以用于再生混凝土板的抗冲切设计.

Abstract:

Considering the recycled coarse aggregate (RCA) replacement percentage as the main parameter, the punching test on recycled aggregate concrete (RAC) slabs was performed. The loaddisplacement curve at the point of punching load, the strain of bottom steel bars, the strain of top concrete, the failure pattern and the punching bearing capacity were studied. Analysis results indicate that: with the increase of RCA replacement percentage, the deformation in each loading stage and the punching bearing capacity of the RAC slabs are reduced. Finally, the formula for punching bearing capacity of natural aggregate concrete slabs was modified and a new punching capacity formula of RAC slabs was proposed based on this test, which can be applied in the punching design of RAC slabs.