Development of optimum design method for composite building structures using structural walls with hysteretic dampers

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The following conclusions are reached on bases of the experimental study on the composite structural walls developing a new type of collapse mechanism generated by overturning moment.(1)Four types of composite walls designed to be failed in overturning collapse mechanism were fabricated and tested under the cyclic lateral loading condition. Three of them behaved in a satisfactory manner as expected from a view point of the basic criteria, i.e. stiffness, strength, and energy absorption capacity. Indications of any kinds of shear failure were not observed in the plastic hinges developed at the bottoms of the concrete filled steel tubular columns.(2)The coupling girders in the wall specimens yielded at the small story drift, and absorbed a large amount of energy without a severe damage in appearance. It is concluded that the H-shaped steel coupling girders can take a role of the hysteretic damper.(3)It was observed in the test of the two open frames that the reinforced concrete columns confined by the square steel tube behaved in a ductile and stable manners without damage to be repaired after a severe earthquake. There is no reason for avoiding column hinging during a severe earthquake from a view point of performance-based design philosophy, if the soft story mechanism is prevented by the structural walls.(4)The behavior of the wall specimens can be predicted with a reasonable accuracy by the analytical method used in the analytical phase of this study.