A Calculation Method of Reinforcement Ratio of Reinforced Concrete Slab Based on Strength Reduction Method
A reinforced concrete slab, reinforced concrete technology, applied in the field of structural analysis, to achieve the effect of improving efficiency
Active Publication Date: 2020-12-15
陕西兴领界实业有限公司
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Numerical solutions have advantages in solving complex problems, and have been widely used in the analysis of reinforced concrete structures, but most of them focus on the analysis of stress distribution and deformation characteristics, and are rarely applied to the calculation of reinforcement ratio
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[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0039] The present invention is based on the reinforced concrete slab reinforcement ratio calculation method of strength reduction method, comprises the following steps:
[0040] The parameters of the proposed calculation example are as follows: the span of the long side of the rectangular plate supported around the four sides l x =6m, short side span l y =3m, the board side length ratio λ=l x / l y = 2; plate thickness h = 0.5m; protective layer thickness h s =0.04m; concrete strength grade is C30, axial compressive strength f cc =13.8MPa, axial tensile strength f tc =1.39MPa, elastic modulus E c =30GPa, shear modulus G c =12GPa, density ρ c =2600kg / m 3 , Poisson's ratio μ c =0.2; the grade of the main tensile steel bar is HRB335, and the tensile strength is f ts =280MPa, compressive strength f cs =280MPa, diameter is 0.01m, elastic modulus E s =...
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The invention discloses a reinforcement ratio calculating method for a reinforced concrete plate based on a strength reduction method. The calculating method comprises the steps that step one, shear strength of plain concrete is deduced according to Mohr's circle; step two, the equivalent shear strength of reinforced concrete is deduced according to deformation compatibility; step three, the equivalent tensile strength of reinforced concrete is deduced according to a rebar stretching yield mode; step four, according to shear ultimate equilibrium and tensile ultimate equilibrium, the strength reduction method is adopted for calculating the reinforcement ratio of the reinforced concrete plate meeting the structure bearing capacity. Based on the Mohr's circle and a strain coordination principle, the equivalent shear strength and tensile strength of reinforced concrete are deduced, and according to the shear ultimate equilibrium and the tensile ultimate equilibrium, the strength reductionmethod is adopted for calculating the reinforcement ratio of the reinforced concrete plate meeting the structure bearing capacity. The method can be directly applied to engineering practice, it is notnecessary to repeatedly adjust parameters for trial calculation, the efficiency is greatly improved, and an adopted numerical method is suitable for various types of calculation of the reinforced concrete plate.
Description
technical field [0001] The invention belongs to the field of structural analysis, and relates to a method for calculating the reinforcement ratio of a reinforced concrete slab based on a strength reduction method. Background technique [0002] The current design method of reinforced concrete structures is mainly based on checking calculation, and the reinforcement ratio needs to be drawn up based on experience. If the calculation does not meet the requirements of section bending and shear resistance, the reinforcement is usually added based on experience and then re-checked, often after many trial calculations to obtain satisfactory results. Numerical solutions have advantages in solving complex problems, and have been widely used in the analysis of reinforced concrete structures, but most of them focus on the analysis of stress distribution and deformation characteristics, and are rarely applied to the calculation of reinforcement ratio. Contents of the invention [0003...
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IPC IPC(8): E04C2/06G06F17/10
CPCE04C2/06G06F30/17
Inventor 线晨张震
Owner 陕西兴领界实业有限公司