|Budget Amount *help
¥1,600,000 (Direct Cost : ¥1,600,000)
Fiscal Year 1992 : ¥300,000 (Direct Cost : ¥300,000)
Fiscal Year 1991 : ¥1,300,000 (Direct Cost : ¥1,300,000)
The authors have proposed new steel braces in framed structures which effectively resist compressive loads on the 3rd international conference held on september 1990, and have got evaluation well. Also many kinds of opinion was given and proposed. The new braces called unbonded braces(thereafter, referred to as U.B.), are restrained by reinforced concrete to enhance buckling load up to almost the yield strength of the steel braces without the change of their rigidity by providing insulations between steel braces and reinforced concrete covers. The behavior of U.B. was analyzed and the results were verified through a series of experiments ,. Furthermore, the U.B. are developed with fiber glass reinforced plastic (thereafter, referred to as U.B.F.) to enhance buckling load and ductility.
The U.B. consisted of a flat steel brace and a reinforced concrete cover. The reinforced concrete cover is not transmitted any axial force from the flat steel bar using grease. It is well known that a buckling mode of a brace on elastic cotinuous supports depends on the rigidity of the supports (i.e., reinforced concrete cover), that is, the buckling mode transfers to the higher buckling mode with the increase of their rigidity. The buckling modes of the U.B. which occurred due to their rigidity of the reinforced covers are 1st or 2nd degree in this paper.
More over, the authors was made clear how to analysis on this U.B by using photo-elastic methods. Still more, these results of all research will be make clean on the next international conference (the 3rd international conference in steel-concrete composite structures at June, 1994. KOSICE of slovak).