Transactions of JWRI Paper Information

Trans. JWRI, Vol. 29 (2000), No. 1, pp. 97-104.

Experimental Study of Brittle Fracture with Plastic Strain at Cruciform Butt Joints (Report III)
- Effect of Bi-axial Loading Condition -

Yoshihiro SAKINO, Hisaya KAMURA and Kohsuke HORIKAWA


     In The Great Hanshin-Awaji Earthquake Disaster, brittle fractures with plastic strain were observed in beam-column connections of steel building frames. It is considered that the mechanical properties of weld metal, especially the ductility, affected the fractures.
     In Report I, we described monotonic loading test results using cruciform butt specimens welded by three types of welding consumable. We examined the effect of mechanical properties of weld metal on fractures under monotonic loading. And in Report II, we described test results to examine the effect of cyclic loading like the earthquake.
     In this Report III, we describe monotonic bi-axial loading test results under two types of bi-axial loading condition using the cruciform butt specimens. The purpose of this paper is to examine the effect of bi-axial loading condition on fractures.
     The main results are summarized as follows. 1) The effects of the bi-axial loading condition on the elongation capacity and the fracture-surface appearance are small compared to the ductility of the material and temperature of the specimen.
     And by this experiment, the following considerations about the elongation capacity and the fracture-surface appearance become more reliable. 2) The ductility of weld metal greatly affects the elongation capacity regardless of other conditions. In the case of the cruciform butt joints with brittle weld metal, the temperature of the specimen also greatly affects the elongation capacity. 3) The fracture-surface appearance of the specimen is mainly affected by the temperature of the specimen that substituted for high strain rates.

KEY WORDS: Damage due to Earthquake, Steel Structures, Welded Joints, Cruciform Joints, Charpy Absorbed Energy, Brittle Fracture, Bi-axial Loading



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