地震時における合成ばりの正曲げ耐力評価

概要

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Assuming a steel moment frame with composite girder subjected to horizontal loading, ultimate positive bending capacity of the composite girder is investigated experimentally. Under such a loading condition, the compressive stress in a concrete slab at positive bending side of composite girder should be balanced mostly by the bearing stress reacting at column face. Therefore, the effective width of concrete slab under ultimate bending moment will be determined by the ultimate bearing strength of concrete at column face. Push-out test of concrete slab was carried out firstly to obtain an information on ultimate bearing strength of concrete slab. Then repeated and reversed horizontal loading tests on column-to-composite girder subassemblages were carried out. These test results are analyzed using a concept of effective width.
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