| This paper presents a detailed analysis of the mechanical nature about the prestressed laminated concrete slab under increasing uniform surface load until destruction by using ANSYS nonlinear finite element analysis program, and compares the results with the experimental facts.Firstly, the two-way laminated concrete slab which is composed by four prestressed thin concrete plates with ribs was studied in the process of static load destructive experiment. The experimental findings include the laws of load-deflection, the cracking characteristic, the ultimate bearing capacity, the cracking load and so on. The experimental results show that this kind of slab performs excellent in stength and rigidity, and it can meet the demand of bearing capacity and deformation under the regular service conditions without cracking. According to the character of crack pattern and the damages of the floor, it can be observed that this kind of floor presents bidirectional effect obviously. And the mechanical nature of slat is studied by analyzing the feature of integral edge joint.Secondly, based on the experimental study, nonlinear finite element analysis of one-way and two-way laminated concrete slab under the process from the period of bottom thin slab prestressed to construction, then to usage period and last to damage is simulated by adopting ANSYS program. Contrasting the curve of load-deflection, cracking load, ultimate bearing capacity and the divergence graph of crack, the finite element analysis is proved feasible and appropriate.Lastly, by analyzing the experimental data and the results of ANSYS, the formula of stiffness refering to the one-way laminated concrete slab under the short period load is obtained. Moreover, the deflection calculation method of the two-way laminated concrete is discussed.Above-mentioned research findings maybe provide references for engineering application and further study of the prestressed laminated concrete slab. |
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