The light steel keel fireproof composite floor slab is a new type of fabricated floor slab.Because of its small self-weight and large bearing capacity,the composite slab with attached fireproof layers at top and bottom of the slab is a floor slab with good fireproof capacity.This kind of floor slab is directly placed on the I-shaped steel beam as a simply supported slab,and the negative moment cannot be transmitted at the support.Therefore,a through crack will appear at the top of support of the beam,which will seriously affect the use effect.At the same time,the simply supported floor system does not meet the requirements of seismic code.In this paper,a new connection mode of beam-slab joint at the support is proposed.The purpose is to realize the transfer of negative bending moment at the support from simple support to consolidation through reasonable connection.In the test,the hydraulic jack is used to apply static load to the test specimens,and 11 full-scale joint connection specimens are studied.Considering the overlapping length of the connector,the thickness of the connector,the number of self-tapping screws(bolts)used for connection,and the influence of the size of the connector on the bearing capacity and deflection of the beam-slab connection joint,the deformation coordination ability between the joint connector and the C-type light steel keel is analyzed,The research shows that the beam-slab joint connection method with Z-shaped steel is safe and reliable,and can realize the double span or multi span connection of the new floor slab.
关键词
轻钢龙骨/防火楼板/梁板节点/试验研究
Key words
light steel keel/fireproof composite floor/beam-plate node connection/experimental research
维普
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