The Finite Element Analysis And Study On Design Method Of New Two-way Prestressed Prefabricated Hollow Floor Slabs

At present,the application prospect of the assembled hollow floor cover in engineering is gradually surpassing that of the cast-in-place floor,and the requirements for large span and seismic performance are also getting higher and higher in the building.The new two-way prestressed assembled hollow floor cover integrates the prestressed technology of unbonded and bonded mixed reinforcement and the prefabricated hollow floor cover technology,which has the advantages of large span,light weight and convenient construction.However,there is no specific study on the specific performance of the new two-way prestressed assembled hollow floor cover with bonded and unbonded mixed reinforcement at home and abroad.Therefore,it is necessary to conduct a more in-depth study on the new two-way prestressed assembled hollow floor.In this paper,the test building cover is taken as the research object,and the new bidirectional prestressed hollow floor cover is simulated by finite element method,and the validity of the model is verified in detail.The new bidirectional assembled floor is used by the finite element model.The basic mechanical performance of the plate was studied.On the basis of this,the parameters of the new two-way prestressed assembled hollow floor cover were studied by changing the parameters of the new two-way prestressed assembled hollow floor cover.The influence of deformation performance;the calculation formula of the plastic analysis method for bidirectional prestressed of the new two-way assembled hollow floor cover structure based on the limit equilibrium method of the existing plastic analysis method.The main work of the thesis is as follows:(1)Based on the new bidirectional prestressed assembled hollow floor test model,the finite element analysis model is established to verify the feasibility,reliability and accuracy of the model.(2)Through the ANSYS finite element analysis software,the basic force performance of the new two-way prestressed hollow floor slab under the uniform load of concrete and prestressed tendons.(3)Study the bonding mode of longitudinal prestressed steel bars of new bidirectional prestressed hollow floor slabs,the reinforcement ratio of non-prestressed tendons,the thickness and aperture ratio(h/d),the hole spacing and the aperture ratio(s/d)the influence of different parameters such as the height difference of the longitudinal and transverse prestressed tendons(?h)on the stress and deformation performance of the floor covering.(4)According to the existing internal force analysis theory,the calculation formula of the plastic analysis method of the bidirectional prestressing of the new two-way assembled hollow floor cover structure is corrected,and the new bidirectional prestressed assembled hollow floor cover is standardized.