Research On Cooperative Working Performance Of Strip Foundation And Water-Proof Slab

Strip foundation under columns and water-proof slabs have unique advantages and good comprehensive benefits. This structure has been widely used in practice in China currently, but the research on this new system's cooperative working performance and design method is almost a blank. Aiming at strip foundation under column with water proof slab cooperative working performance were studied, the paper puts forward the design proposal, specific content as follows:1. Use nonlinear fem analysis for strip foundation under column with water-proof slab's cooperative working performance, while considering the influence of the overall collaborative work for seting polyphony board under water-proof slab and material nonlinearity as well as nonlinear problems of contact between the foundation and subsoil. Research shows that:①Setting the weak cushion as polyphony board under water-proof slab, foundation counter force is lesser,so setting the weak cushion in some extent can rise to reduce foundation counter force.②Because pouring the concrete integral, the overall coordination utility between foundation beams and waterproof slabs, making waterproof slab in still assume certain foundation counter force, causing waterproof slabs produce upward buckling and crack, So in practical engineering, foundation counter force of waterproof slab cannot be ignored, should give certain consideration.2. Strip foundation under column with waterproof slab's cooperative working performance have lots of influence factors, by means of analyse these factors such as waterproof slab thickness, polystyrene plate thickness, the height of foundation beams, the elastic modulus of subsoil and waterproof slab reinforcement ratio, giving the foundation counter force's change rule with foundation settlement.3. with analyse the ratio of the average foundation counter force between waterproof slab and strip foundation, We got foundation counter force of waterproof slab is strip foundation's 20%-30%by considering the ratio of cross and thick of waterproof slab, the ratio of cross and height of foundation beams, the thickness of polystyrene plate and the elastic modulus of subsoil. At last, put forward safe advice:while design water-proof slab,its foundation counter force According to 0.3 times Of strip foundation.