In this paper, three case studies intending to apply smart materials to civil structures are presented. The first one is a study of response control using piezoelectric actuators. Actuators are inserted into the bottom of a column to produce a bending moment force. A control algorithm using the model matching method is introduced, and this algorithm is checked in shaking table tests of a four story frame. The second one is damage sensing of a structural member, using electric resistance characteristics of shape memory alloys. The relationship between electrical resistance and strain of shape memory alloy wire is studied and the maximum strain of the specimen which is regarded as a structural member is estimated. The third one is an energy dissipation device using super-elastic characteristics of a shape memory alloy. A basic energy dissipation device model using nitinol wire is proposed. The energy dissipation capacity is investigated by device tests, and an analytical model is constructed based on the test results.
The paper reports the fundamental performances of lightweight concrete with density of 1.4, based on an experimental study on the properties of composite slabs with trussed steel decks using superlightweight concrete under bending moment. The test results by full scale specimens showed that the composite slab using trussed steel decks and the super-lightweight concrete had the same capacity with the composite slab using normal concrete in strength, deformation, and crack propagation, It was concluded that the calculated values by the conventional theoretical method showed good agreement with the experimental results.
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