Experimental Study And Analysis On The Performance Of The Hollow Slab With No-cabinet Sunken

Since its birth, cast-in-situ hollow concrete floor has been greatly developed inengineering practice due to its favorable economic performance and load-carryingcapability, as well as its ability to meet people’s demand for space of long-spanarchitecture. In recent years, the combination of different section forms and newmaterials and processes has been constantly promoting the development of cast-in-situhollow concrete floor in engineering. Engineers’ researches of cast-in-situ hollowconcrete floor are gradually going deeper. The construction technologies and designapproaches are being continually perfected and gradually going towards maturity.Since2003, the research group has successively launched the assembly hollowslab with cast-in-sit ribs and the new concrete double hollow-ribbed floor. Both ofthem have been widely used in various projects and become a great success. Based onthe two hollow floors, the research group has invented the hollow slab with no cabinetsunken,which aims at solving such problems as low recycle utilization rate of internalmodel and heavy workload of spot shuttering assembly. This paper carries out aresearch on the mechanical property of the new hollow floor.(1) This paper gives a brief introduction of domestic and overseas developmenthistory and research status of cast-in-situ hollow concrete floor; it also introduces thehollow slab with no cabinet sunken and its advantages in engineering.(2) Through a baseplate stiffness test in elastic stage involving a2.4×2.4mhollow-ribbed floor and the2.4×2.4m hollow slab with no cabinet sunken, it studiesthe difference in load-carrying capability of the hollow-ribbed floor and the hollowslab with no cabinet sunken. This difference results from whether there existsprefabricate baseplates. By exploring the effective flange width of the cross section inelastic stage, this paper also presents a method to compute the baseplate’s stiffnesscontribution factors.(3) Through a test of the full-scale simply supported square the hollow slab withno cabinet sunken, it explores the floor’s deflection, the rebar’s strain and theconcrete’s strain as well as the failure patterns of the specimens. On this basis, thispaper gives an analysis of the ultimate bearing capacity of this kind of the floor. Whentaking the film effect into consideration, it presents a computing method and the correlation formula for calculating the ultimate bearing capacity of the floor underdifferent boundary conditions.(4) This paper also gives an ANSYS analysis of the geometrical factors, whichhave influence on the mechanical property of the hollow floor with the hollow slabwith no cabinet sunken.The geometrical factors include the width of the boundarybeam, the width and spacing of the cast-in-place ribbed beam. Additionally, itdiscusses the influence of a single parameter on relevant mechanical properties of afloor. Finally, reasonable value ranges of the parameters are put forward in the designof a floor.