Experimental study on plug-in filling hole for steel bar lapping of precast concrete structure

In order to study the connection method between reinforced bars of the precast concrete structure, based on research results about reinforcement anchorage experiments, 108 lapping tests were completed. For the area percentage rate of the lap joints at 100%, the reinforcement lapping length was determined. According to the facts of bars diameter, concrete strength and different lapping length, some specimen simple tensile tests were completed. The failure mode and the impact law of factors about the reinforcement lapping were obtained, and the reasonable length was calculated. Through a series of tests and discussions, the plug-in filling hole for lap-joint of steel bar is a reliable connection, simply construct and suitable for precast concrete structure reinforced connection under the housing industrialization.