橋梁の耐震(4)

[I-305] Experimental Study on fracture properties of High-strength steel (Q690) under High Stress Triaxiality

〇YAN LIU¹, Shuto Ikeda², Hanbin GE², Lan KANG³ (1.MEIJO University Graduate School, 2.MEIJO University, 3.South China University of Technology)

Keywords:High-strength steel, High Stress Triaxiality, notch, Stress concentration

Based on previous studies on the construction of a ductile fracture evaluation model for steel under high stress triaxiality, a ductile fracture model was proposed for SM490 and its applicability was examined. However, in recent years, bridges using high-strength steel materials are increasing, and rationalization of structures such as reduction of life cycle costs is being promoted. In this study, a monotonic tensile test was performed on a high-strength steel Q690 (equivalent to SBHS700 in Japan) recently developed in China, the purpose is to accumulate experimental data necessary for elucidating the ductile fracture mechanism.