Research on influence factors and formulae for the bearing capacity of Twin-PBL Shear Connectors

摘要

Relying on a practical application in pre-stressed concrete box-girder with corrugated steel web, four models of Twin-PBL shear connector are made and experimented in push-out test. The main research contents are influences for bearing capacity and load-slip relationship. The results show that: when the size of holes on the steel plate has a definite value, the connectors' bearing capacity get a significantly development when the diameter of reinforced-throughout increases in the appropriate range. If the space between reinforced-throughout and holes are too small, the coarse aggregate will be prevented into the holes so as to reduce its bearing capacity. In addition, thickness of steel plate has less influence on bearing capacity of connectors. All models show similar load-slip trend and superior ductility. Finally, according to comparing and analyzing differences between calculated values from recommended formulas and measured values from tests, a new formula is deduced which can estimate the test results well. The standardization of push-out test needs further research so that Twin-PBL Shear Connectors can be widely used in project.