Nonlinear Finite Element Analysis(FEA) Of Concrete Beams Strengthened With Anticorrosive High Strength Steel Wires

Recently, the focus of buildings at home and abroad has gradually shift fromlarge-scale constructing new buildings to repairing and reforming of the existing buildings.According to the relevant departments of statistics, the industry building accounted for40%of the total number of the existing domestic buildings, and most of which areconcrete structures. More over, if we could modify the original building to make the best,it not only could cut down the investment, reduce the requisition of land, but also candevelop the low-carbon economy and alleviate the contradiction in the increasingly tenseurban land.A strengthening method which adopts galvanized steel wires and anticorrosive mortarto reinforce concrete beam is presented. This method has the properties of simpleconstruction program, high strength, thermo stability，corrosion preventive and agingresistance.This topic is based on a series of experimental data from Hebei Building ScienceAcademy, and utilize finite element analysis program ABAQUS to carry out nonlinearsimulation analysis. According to two sets of the experimental data of less reinforcedconcrete beams and under reinforced concrete beams were strengthened by theanticorrosive high strength steel strand, through the finite element software ABAQUSprogram, we establish reasonable entity model. We were trying to ensure the reasonableelement type, the relationship of material constitute, boundary conditions, mesh element,and debug the criterion in order to achieve the practical simulation model. Herein, theprestressing force was inflicted with the initial stress method of physical forcereinforcement method. To adopt the MPC-Beam to simulate the anchorage, that makes theconcrete beam and mild tension prestressed steel strand at the node of the anchor endpossess the same deflection and curvature, thus, to simulate the deformation compatibilitybetween the external prestressed steel strand and concrete at the end of anchorage. In theanalysis of the second load of structure, writer employs birth and death element inABAQUS software technology, to deactivate and reactivate the unit to simulate the construction process of the test, so as to achieve the simulation effect of reinforcementrequirements. To better deal with the performance of the unbonded prestressed reinforcedconcrete beam，which indicates the whole loading process changes, this paper introducesABAQUS to simulate nonlinear analysis the unbonded prestressed beam from loading onthe member until the whole process of beam was failure.All above comparisons of the theoretical foundation, these simulation models of twogroups of beams were set up to analysis the anti-bending performances of the in-servicereinforced concrete beams which adopt to the strengthening method. Discuss thecooperative performance of new and old concrete structure, to reduce the extent of thestress hystersis of steel strand as much as possible, so as to confirm its reinforcementeffect and application, and then to guide the design and construct the reinforcement.