The Calculation And Analysis Of A New Type Of Superimposed Slab

This thesis mainly discussed one type of two-way superposed slab floor with prestress in one way. The lower layer of the superposed floor is precast-prestressed slab, and the upper layer of it is cast-in-situ concrete reinforcements set in the precast slab lapped with each other at the side of the slab. In this way, the floor stands loads in two ways. The prestress in precast slab can improve mechanical performance and meet the demands of large room width in many buildings structures.Summarizing former experiment results, a building structure for testing was constructed. According to the present design code.3-wire strands with tensile strength of 1570 MPa were collocated in the lower precast concrete-slabs of superposed floor. It raised stiffness in the way of adding truss in the present. At the same time, controlled and decreased the finally bending deflection with prestress reinforcements tensile force.Combinating the advantages of light weight, high bearing and good wholeness of the hollow floor, changed the superposed slab into hollow plates to ease self-respect and raise the latter bearing the weight of the superposed slab. This type of floor has many merits such as insane, height, bearing capacity, ductility and performance of joint-resistance and restore.The thesis fixed the formula of intensity and stiffness of the new pattern prestress superposed slab through the way of theory analysis and calculation.