Calculation of the crack opening width
Objective: Determine the crack resistance of a beam
Task: Determine the crack opening width
References: Practical calculation of elements of reinforced concrete structures according to DBN V. 2.6-98:2009 in comparison with calculations according to SNiP 2.03.01-84* and EN 1992-1-1 (Eurocode 2) / V.M. Babaev, A.M. Bambura, O.M. Pustovoitova et.al., edited by V.S. Shmukler, – Kharkiv: Golden Pages, 2015. – pp. 88-90.
Initial data file:
Example-14DBN.SAV
report – Arbat 14DBN.doc.
Compliance with the codes: DBN V 2.6-98:2009, DSTU B.V 2.6-156:2010
Initial data:
l=6,0 m |
Beam span |
b×h = 200×500 mm |
Beam section sizes |
а = 26 mm |
Distance from the edge of the reinforcement to the edge of the section |
As = 1232 mm2 (2Ø28) |
Cross-sectional area of reinforcement |
М= 160 kNm |
Bending moment |
Concrete class |
С20/25 |
Initial data in ARBAT:
Importance factor γn = 1
Member length 6 m
Effective length factor in the XoY plane 1
Effective length factor in the XoZ plane 1
Random eccentricity along Z according to DBN B.2.6-98:2009 with modification No.1
Random eccentricity along Y according to DBN B.2.6-98:2009 with modification No.1
The structure is statically determinate
Section
b = 200 mm h = 500 mm a1 = 26 mm a2 = 26 mm
|
S1 - 2Ø28
|
---|
Reinforcement |
Class |
Additional service factor |
---|---|---|
Longitudinal |
A400C |
1 |
Transverse |
A240C |
1 |
Concrete
Concrete type: Heavy-weight
Concrete class: C20/25
Aggregate: Quartz
Additional parameters |
||
---|---|---|
Additional service factor |
1 |
|
Age of concrete (days) |
28 |
|
Cement strength class |
Class R |
|
Creep development time |
36500 |
days |
Temperature T(Δt) |
20 |
°C |
Number of days when the temperature T prevails Δt |
28 |
days |
Relative humidity |
40 |
% |
Crack resistance
Parameters |
||
---|---|---|
Maximum crack opening width wmax |
0,3 |
mm |
Comparison of solutions
Check |
Crack opening width |
---|---|
Guide |
0,26 mm |
ARBAT |
0,869х0,3=0,261 mm |
Deviation, % |
0,4 % |