The Experimental Study Of The Pre-Tensioned Prestressed Concrete Goose-Shaped Slab(ribbed Type)

Since the 1960s,after domestic concrete T-shaped plate,saddle-shaped double-curved plate and V-shaped folding plate roof structure,a new type of beam plate has gradually developed.The engineering practice proves that it is a kind of stru-ctural component with reliable structure,advanced technology and good economic indexes,and has a good prospect of engineering application.Due to the update of《Code for design of concrete structures》,the applica-tion of high strength steels,especially high strength steel wire strands,it is necess-ary to revise the standard atlas of the original prestressed goose-shaped slab,and the new standard goose-shaped slab was tested and validated in this paper.The finite element software MSC.Marc was used to establish the analytical model of the goose-shaped slab YYBx.6-4,and the numerical simulation was carr-ied out.Based on finite element software analysis,the following conclusions are obtained:the maximum deformation is in the both wings position,across the mid-dle of the slab,deformation of 46.53mm,less than the deflection limit value L₀400（28）505.mm,most of the axial stress of the goose-shaped slab in the X,Y,Z axis are compressive stress,local position has tensile stress.The uniformly-loaded water load test was carried out on the ribbed pre-tensioned prestressed concrete goose-shaped slab YYBx.6-4 with the mark span21m、mark width 2m、selection of C40 concrete and the stress-ribbed steel wire)73(^H5,at both ends of the test,brick-pile support was used to prevent the side ti-lting of the specimen,no support in the cross,the end is tiled and the top of the goose-shaped slab is flat,thick plastic sheeting was put on the slab surface,the variation of mechanical properties of the goose-shaped slab under the action of water load was analyzed and studied,including load-deflectionrelations、load-strain relations、the strain distribution of cross section concrete、displacement gr-owth rate、displacement recovery rate、the strain growth rate of cross section m-easuring point、strain recovery rate、anti-bending failure mechanism、limit bear-ing capacity,etc.One of the problems that should be paid attention to is the buck-ling failure and stability of thin-walled beam structures.After decucting the self-weight effect,theoretical calculation shows that the cracking load is.268kN/mand the failure load is.576kN/m.The water wasloaded to4.418kN/m,which was about 2.5 times of the load,and no crackwas found,it showed that the goose-shaped slab was in a flexible working state,after unloading,the deformation was fully recovered,the correctness of the newdesign standard atlas was validated,and it can be used as reference frame for the evaluation and acceptance of the new standard atlas.