Experimental Study on Shear Performance of PBL Shear Connectors in Steel-Thin UHPC Composite Bridge Deck Structure
In order to investigate the shear properties of PBL shear connectors in steel-ultra-high per-formance concrete(UHPC)composite bridge deck structure,a total of 16 PBL specimens were tested using shear plate sizes,perforating reinforcement setting,and shear plate end bearing status as test parameters.The results show that:(1)With the increase of shear plate size,the shear failure mode changes from the fracture of steel plates without obvious damage to UHPC dowels to that with local or complete crushing of UHPC dowels before the fracture of steel plates,and correspondingly,the ulti-mate bearing capacity of PBL increases,but the ductility shows no significant change.(2)The influ-ence of perforating reinforcement on the bearing capacity of the shear connectors is closely related to the damage state of the UHPC dowels.The improvement in shear bearing capacity of PBL increases from 5.3％with no obvious damage to UHPC dowels to 9.7％with locally crushed UHPC dowels,and then to 14.9％with completely crushed UHPC dowels.(3)For multiple rows of PBL shear connectors arranged in parallel arrays in steel-UHPC composite bridge deck structure,when the column spacing is not less than 10 times the perforating reinforcement diameter or 12 times the shear plate thickness,the interaction between adjacent rows of PBL will show little impact.Based on the test results,a for-mula for calculating the shear capacity of PBL shear connectors in composite bridge deck structure was proposed,and its applicability was verified by the test results in this paper and other literatures.
万方数据
维普
