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Crack Detector Concrete Crack Width Calculation Measurement Instrument, Find Complete Details about Crack Detector Concrete Crack Width Calculation Measurement Instrument,Crack Detector,Concrete Crack Width Calculation,Crack Measurement Instrument from Other Measuring & Analysing Instruments Supplier or Manufacturer-Dalian Taijia Technology Co., Ltd. The crack width can be calculated by numerical calculation based on bond analysis, however, it is necessary to assume the local bond stress versus slippage relationship for calculation. The local bond stress – slippage relationship is the dominant factor of controlling crack width and spacing, so to comprehend the relationship is absolutely imperative for predicting the crack width and spacing.
Calculation of the crack width in concrete
Design code BS 8110 & BS 8007 INPUTS Concrete strength Reinforcement yeild strength Modulus of elasticity of reinforcement steet Fcu Fy Es As b h d = = = = = = = 40 420 200000 Mpa Mpa Mp a 1005 1000 500 562 mm mm mm mm Co S DIA acr Ms = = = = = 75 125 25 95 mm mm mm mm 298 kN.m Eco α P X Z Fs Fc ε1 = = = = = = = = 4700xSQR 4700xSQRT(f'c T(f'c)) Es / Eco As / bd (-αp (-αp + Sqrt((αp)^2 + 2αp)) 2αp )) x d d - X/3 Ms / (As x Z) Fs x As / (0.5xbxX) (F (Fs /Es) x (h-X) / (d-X) ε2 ε2 ε2 > ε2 εm = = = = = b x (h-X)^2 / (3xEsxAsx(d-X)) 1.5 x b x (h-X)^2 / (3xEsxAsx(d-X)) 0.000237 ε1 - ε2 Reinforcement area As shown in the provided figure As shown in the provided figure As shown in the provided figure Minimum clear cover of the tension 2 reinforcement Maximum bar spacing Bar diameter As shown in the provided figure Applied service moment CALCULATIONS Modulus of elasticity of concrete Modular ratio Reinforcement ratio Depth of the nutral axix lever arm Actual reinforcement stress Actual concrete stress Strain at the soffit of concrete Strain due to the stiffening effect of concrete between cracks: for crack width of 0.2mm for crack width of 0.1mm Average strain for crack width calculation Out comes Calculated crack width w = 3 x acr x εm / (1+2x(acr-Co)/(h-X)) 26587 7.52 0.18% 85 534 556 13 0.002417 = Mpa mm mm Mpa Mpa 0.000599 0.000898 0.002180 = 0.57 mm
Eurocode 2 part 1-1: Design of concrete structures 7.3 Crack control
The crack width, wk, may be calculated as follows:
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