Experimental Research on New Grade 3 Steel bars Dynamic Mechanical Property and Its Application to Blast resistant Structure

Abstract:

Based on the static tensing test, the dynamic mechanical behavior of new grade 3 steel bars (NG3S) with different strain rates was first experimented systematically on the rapid loading test machine of KG 5, the complete dynamic stress time curves of NG3S under high strain rate were given, and the dynamic mechanical properties of NG3S were analyzed based on the test results. Then, through dynamic beam test on the rapid loading test machine of KG 500, the static and dynamic bending bearing capacity of NG3S concrete beams with different reinforcing percents and concrete strengths were studied by experimental method and compared with the beams with ordinary grade 2 steel bars. The result shows that the NG3S materials are of good dynamic properties and its dynamic performance increases with the strain rate, but the plastic property maintains invariable. The adoption of NG3S in protective structure brings a favourable comprehensive benefit. Finally, the key problem was put forward that the NG3S should match with the concrete strength.

Key words:rapid loading; dynamic mechanical behavior; bending bearing capacity; experimental research