Abstract
Numerical analyses on buckling-restrained unbonded braces fixed in a frame were made using the non-linear finite element method and the following conclusions were obtained. 1) The hysterisis charachteristics and strain distributions of core steels on "frame model" are almost same as those on "basic model (non-eccentricity and no-moment model)." 2) The hysterisis charachteristics on "obliquely loaded model" are almost same as those of "basic model" although the strain distributions of core steels on "obliquely loaded model" are slightly larger at the end parts than those on "basic model." 3) Locally concentrated cumulative plastic strains of core steels due to earthquake are much small in comparison with cumulative plastic strain of steel to low cycle fatigue failure. 4) The hysterisis characteristics and strain distribution of extremely long unbonded braces are almost same as those of "basic model."
