Finite Element Analysis Of The Behavior Of Two-way Slab In Different Cover Thichness And Strengthened With CFRP

Concrete cover on the structure plays an important role,the thickness of concrete cover suitable not only to give full play to mechanical properties of steel,and can satisfy the structural durability and strength demand.In the actual project,because the slab of negative moment concrete cover of partial caused by quality problems be too numerous to enumerate.At home and abroad on the noncontinuous plate and a cantilever plate thickness of concrete cover on the large side has certain research,but most of the cast-in-place board in engineering are continuous slab,the thickness of cover partial assembly bearing state of the normal use state of the board as well as the limits of what impact,both at home and abroad for the research of this aspect is relatively less. So this paper simulation and based on the actual engineering load tests were made through analysis and research with the finite element software ABAQUS.In view of the above problems this paper made a research on the:(1) Through the finite element analysis software ABAQUS simulation analysis of the impact of the negative reinforcement concrete cover thickness changes on the two-way continuous slab bearing capacity.That negative reinforcement concrete cover thickness increases two-way slab bearing force does not occur greatly reduced, even when the negative reinforcement in the thickness of plate in the middle position, two-way slab bearing capacity is still not high mutation.(2) Through the finite element analysis software ABAQUS simulation analysis of the effect of two-way continuous slab of different span of the bearing capacity of the negative reinforcement cover thickness change protection.That, with the increase of ratio of length to width, regardless of the boundary conditions under which the two-way slab bearing capacity gradually decreased, normal use limit and lattice, Benge, angle lattice bearing force( 200/0l) and ultimate bearing capacity( 50/0l) are along with the length width ratio(length width ratio is less than 1.5) a linear variation.(3) Through the finite element analysis software ABAQUS simulation analysis of the effect of two-way continuous slab of different boundary condition of the bearing capacity of the negative reinforcement cover thickness change protection.It is concluded that the increase of the negative reinforcement concrete cover is the most important to the bearing capacity of the grid, while the edge case is the smallest..(4) By carbon fiber cloth of two-way continuous slab at the support reinforcement,analyzes the influence of two-way continuous slab negative reinforcement cover thickness of carbon fiber cloth reinforced bearing capacity.That the carbon fiber cloth reinforced two-way slab, solid, the larger the number of supported edges, to increase bearing capacity is improved ability stronger, reinforcement effect is more obvious.(5) By protecting the detection cover thickness on the practical engineering of reinforced,field loading tests on cast-in-situ plate negative reinforcement protection cover is thicker,get the load displacement curves,and compared with the results of finite element simulation.The result of ABAQUS is that the actual working state of the structure can be better..