Journal
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
Volume 33, Issue 2, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)MT.1943-5533.0003542
Keywords
Q460GJC; Thick plate; Static performance; Low cyclic performance
Categories
Funding
- National Natural Science Foundation of China [NSFC-51578089, NSFC-51508050]
- 111 Project [B18062]
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The study investigates the variations of static and low cyclic performances of Q460GJC thick plates in different layers in the transverse and Z-direction. The results show that the closer the material is to the outer surface, the higher the yield strength, better ductility, and increased cyclic strength. Additionally, transverse specimens exhibit higher yield strength and reduction area compared to Z-direction specimens at the same layer. The thick plates also demonstrate good seismic performance in both directions at different layers.
High performance Chinese domestic structural steel (referred to as GJ steel) has been applied to many major construction projects due to its high performance, high yield strength, and good mechanical properties. In this paper, the variations of the static and low cyclic performances of Q460GJC thick plates at different layers in the transverse and Z-direction (along the plate thickness) are described and discussed. Static performance tests under monotonic tensile loading were conducted on the transverse and Z-direction specimens of 25-, 42-, and 80-mm thick steel plates to obtain the stress-strain curve, yield strength, tensile strength, elongation, and reduction of the cross-sectional area after fracture of each specimen. Low cyclic performance tests under equal-strain increase and equal-strain amplitude loading were also conducted on the transverse and Z-direction specimens of 80-mm thick steel plates to obtain the cyclic hysteresis curve, skeleton curve, cyclic strength, and cyclic hardening degree for each specimen. The main findings from this study are the following: (1) the closer the material is to the outer surface of the Q460GJC thick plates, the higher the yield strength and the better the ductility; (2) the yield strength and the reduction in the area of the transverse specimens are higher than those of the Z-direction specimens at the same layer; (3) Q460GJC thick plates have good seismic performance in both transverse and Z-directions at different plate layers; and (4) the closer the material is to the outer surface, the higher the cyclic strength. (C) 2020 American Society of Civil Engineers.
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