Crack Width Calculation Euro Code 2
Eurocode - Calculation of Crack Width (Urgent)
2 1 (7) The minimum crack spacing is equal to half the maximum crack spacing. Accordingly, the minimum crack spacing can be calculated as: bm s ctm ft res r,min f f s. 4 1 (8) The average crack spacing during the crack formation can be estimated as the average value of (7) and (8) which gives (in Eurocode 2 it is assumed that s r,max = 1.7×s r,m). The crack width of a flexural member is calculated to satisfy a limit state of serviceability. Among prestressed concrete members, there is cracking under service loads only for Type 3 members. Hence the calculation of crack width is relevant only for Type 3 members. The crack width is calculated for the cracks due to bending which occur at.
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Eurocode - Calculation of Crack Width (Urgent)
1. According to BSEN1992-3 Cl.7.3.1, If I am designing for a beam (300mmx400mm) in the substructure (tightness class 1, max water depth 3.9m), is that means the allowable crack width of the beam shall be limited to wk1 = 0.16mm (as hd/h = 3.9m/Min(300mm,400mm)= 13). And same shall apply to the column (400x400mm), ( hd/d = 3.9m/400mm = 9.75)?
2. According to Eq.3.13 in CIRIAC660, I could calculate the crack width due to thermal & shrinkage, but shall I combine it with the flexural crack width calculated from Eqt. 7.9 in BSEN1992-1-1:2004 to check against the allowable crack width limit (0.16mm)? Or the design will be OK if the two resulted crack width satisfy the limit individually.
3. According to 7.3.3(2) in Eurocode BSEN1992-1-1:2004, the crack control shall deem to be OK if either the maximum bar diameter or maximum bar spacing are satisfied, and direct calculate of the crack width is not required. But does it only refer to flexural crack width? Shall I still need to calculate and check the thermal & shrinkage crack width if those crack are expected to occur?
Sorry for my poor English and I have attached my design spreadsheet for your checking.
Many Thanks!!!!!!!!!!!
- суббота 07 марта
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