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Structural characteristics of K-braced frames were studied, with emphasis put on the variation of frame characteristics caused by the eccentric brace-to-beam connections (see Fig. 2.1.). The tests and analysis were conducted with particular attention ascertain wherther the yielding due to shear of the beam web subject to eccentric reaction from the braces would be such that the frame as a whole could have a stable characteristics, maintaining sufficient brace stability. (For the test and analysis procedures, see the Japanese text.) The test and analysis results may be summarized as follows : (1) Comparison between the test results and the theoretical results The test results and theoretical results by analysis were generally in fair agreement. (2) Hysteresis characteristics By selecting the eccentricity properly, the abrupt decrease of frame strength due to the buckling of braces can be avoided because the yield due to shear of the beam to which braces are eccentrically connected will prevent such buckling. (3) Strength and stiffness frame By providing the eccentricity appropriately, frame stiffness can be controlled without pronouced change in frame strength. (4) Effects of eccentricity of web of beam Although the web enters the plastic range at the initial stage of loading, its histeresis loop recorded under iteration of positive and negative loadings was fairly stabilized.
Fujimoto et al. (1972) studied this question.