Experimental Study on BondSlip Behavior of Postinstalled Rebar at High Temperature

Abstract:

Specimens with 3d embedment depth were tested under different temperatures to study the bondslip behavior of postinstalled rebar.The specimens were heated by the electric furnace,and the test temperature ranged from 25 ℃ to 350 ℃.Records had been made on specimen temperatures,rebar slips and loads.When the specimen temperature reached to the design temperature,the specimen was tested and 5 specimens were tested at each design temperature.Based on the test results,the fitting model about ultimate strength and temperature and the fitting model about peak slip and temperature were obtained.While the fitting model about bond stress,temperature and slip was achieved,anchorage adhesive constitutive relationship at high temperature was obtained.The test results show that the ultimate strength decreases with the temperature increase,especially the ultimate strength is 4% of that of ambient temperature when the temperature is above 350 ℃.

Key words:postinstalled rebar; high temperature; bondslip; ultimate strength