PBL剪力键静承载能力试验研究

Experimental research on the static bearing capacity of PBL shear connectors

通过不同钢板开孔直径与不同贯通钢筋直径试件的静载试验研究,得到各试件的极限荷载值、相对滑移曲线以及荷载应变曲线,并由试验结果分析钢筋直径与开孔直径大小比例对静承载能力的影响。研究结果表明:增大钢板开口孔径与增大贯通钢筋直径均能提升PBL剪力键极限承载力,且增大贯通钢筋直径对承载力的提升更显著;贯通钢筋与开口孔径之比较小时,PBL剪力键极限滑移量较小,破坏没有明显预兆,因此,建议工程上钢筋与开口孔径之比不可太小。

Through the dead-load experiment research on test specimens with different diameters of plate hole andthrough bar, this paper obtained the ultimate load, relative slip and load-strain curves of test specimens. Theinfluence of the ratio of rebar diameter and hole diameter on its static bearing capacity was then analyzed. Theresults show that increasing through bar diameter and the open hole diameter can improve ultimate bearingcapacity of the PBL shear connectors, and the size of the through bar diameter has a more significant influence onultimate bearing capacity. When the through bar diameter is far less than the open hole diameter, the PBL shearconnectors will have a small limit slip amount, and it will not have the obvious signs of destruction. So, it isrecommended that the ratio of the through bar diameter to the open hole diameter can not be too small inengineering practice.