Experimental Study On Lightweight-Steel Framework Concrete Shearwall And Slab

Lightweight-steel framework concrete shearwall structure is an emergedindustrialized structural system for residential buildings, which construction process isthat, first lightweight-steel framework of structural components as walls and slabs arefabricated in the factory, and then the lightweight-steel frameworks are assembled andcast in concrete to form shearwall structure system. For an engineering project of a18-storey high-rise residential building in Tsinghua Housing IndustrializationDemonstration Site in Shui An Xin Du II, the experimental study of the main membersof lightweight-steel framework concrete shearwall structure system are conducted interm of the walls and slabs. The main conclusions are outlined below.(1) Experimental study of lightweight steel framework concrete shearwall. Testsinclude quasi-static tests under cyclic horizontal loads by four lightweight steelframework concrete shearwall specimens. The failure characteristic, hysteretic property,strength capacity, deformation capacity and other seismic performance of the walls areinvestigated and compared with RC walls. It was found that the behaviors oflightweight-steel framework concreter walls are similar with those of RC walls,including the failure mode and mechanical performance. The approach to calculatebearing capacity of RC shearwall can be applied for the lightweight-steel frameworkconcrete shearwall. The results also show that the bearing capacity of the specimens riseup with the increase of axial compression ratio, but the deformation capacity of thespecimens decreased. For the same axial compression ratio, enhancing the boundaryelements can significantly increase the bearing capacity and shift the failure mode, butraise stiffness little. And the internal force of steel profile in the walls can be transferredby lap rebar.(2) Experimental study of lightweight-steel framework concrete slab. Tests includetwo single-span simply supported slab specimens. According to the similar failure modeand crack distribution of the lightweight-steel framework concrete slab specimens withthe ordinary RC slab, the results can evaluate that the performance of the new slabs issimilar with RC slabs. As a consequence, the bearing capacity formula of RC slabsfitted lightweight-steel framework concrete slabs. (3) The recommendations for the design approach of lightweight-steel frameworkconcrete shearwall structure. Considering the perspective of engineering applications,the paper gives the recommendations of the basic design rules of the lightweight-steelframework concrete shearwall structures, and summaries the design principle for themain components of this new structure system，and layouts the main principles oflightweight-steel framework. Finally, connection design principle and typical jointconfiguration of the lightweight-steel framework concrete shearwall structures are alsointroduced.The research of this paper provides the basis for establishing the design method ofthe lightweight-steel framework concrete shearwall structure, and also for applying thisindustrialized housing system provided technological foundation.