Cyclic Behavior of 460 MPa High Strength Structural Steel and Welded Connection under Earthquake Loading

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Abstract
In order to investigate the cyclic responses of high strength structural steel and welded effect on base metal under large inelastic strains induced by earthquakes, 27 coupons of Q460C steel and welded connection were tested subjected to monotonic and cyclic loading with various patterns. The typical behaviors were compared and discussed including monotonic properties, hysteretic behaviors, failure modes and cyclic constitutive characteristics. The monotonic and cyclic behaviors of steels with different yield strengths were also compared. Base on the test results, parameters of this high strength steel material and welded connection for a cyclic model combining isotropic and kinematic hardening were calibrated, which can be incorporated into numerical models of structures in ABAQUS. In addition, the parameters of a constitutive model for beam element analysis were also established and the model was further formulated into numerical analysis as a user defined material in ABAQUS. The analysis results revealed that the cyclic accumulation significantly affected the ductility of steel material and welded connection, comparing with monotonic behaviors. The welded connection coupons displayed greater levels of cyclic hardening than all the base metals, however, welding process made undesirable impacts on ductility of steel structures.

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