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Title |
Flexural Behavior of Hybrid Beam of Reduced Story Height
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Keywords |
지하주차장 층고 ; 하이브리드 보 ; 휨 거동 ; PC 보 ; 매입된 강재 보 story heights of underground parking lots ; hybrid beam ; flexural behavior ; PC beam ; embedded steel beam |
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Abstract |
In underground parking lots of apartment housing, the story height is increased by 300{sim}400mm because of various ducts for HVAC. In order to reduce this story height, this study proposed the 'hybrid beam', which is composed of PC beam with embedded steel beam and insitu concrete. The depth of the hybrid beam is reduced by 300 mm and then the steel beam is embedded over the length of reduced depth to compensate for the loss of strength. Then, we performed the large-scale structural tests on 9 specimens and investigated the flexural behavior of the specimens. The parameters of tests were the shape of steel beam section, the length of the reduced depth, the stage of construction, the effects of slab and shear connectors. The test results showed that the specimens, after the insitu concrete has cured, has the flexural capacity which exceeds the required design capacity regardless of other parameters. On the other hand, the specimens of construction stage do not have sufficient strength. Based on these results, it is thought that the proposed hybrid beam with reduced depth is applicable to the underground parking lots of apartment housing as long as the support is placed at construction stage.
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