Not all cracks in concrete are serious enough to require repair. The hairline cracks in this floor were air brushed with brown dye to achieve a beautiful crackle pattern.
A circular section concrete column analyzed with RCsolver according to Eurocode 2. Eurocode Concrete Design Examples. Eurocode 2: Crack width calculation. Eurocode 2: Crack width calculation crack width calculations according to eurocode 2 Eurocode 2 (EN1992-1-1) proposes equations for the calculation of crack width, taking into account several parameters, like the concrete and steel strain and reinforcing bar. CRACK WIDTH CALCULATIONS ACCORDING TO EUROCODE 2. Eurocode 2 (EN1992-1-1) proposes equations for the calculation of crack width, taking into account several parameters, like the concrete and steel strain and reinforcing bar diameters.
Eurocode 2: Design of concrete structures EN1992-1-1. 22 February 2008 2 Requirements to a code 1. Scientifically well founded, consistent and coherent 2. Full Beam Design Example. And crack-width serviceability requirements are met. Given: SDL = 2.15 kip/ft LL = 2.65 kip/ft f0. Perform code checks.
At what width does a crack in concrete become a problem? That question often arises, but unfortunately there is no definite answer. It can vary from one project to the next. The answer may also change with the person’s perspective: What is acceptable to the contractor, engineer, or architect may not be acceptable to the owner, who must live with the crack day after day. Even the American Concrete Institute has no standards or recommendations that give a 'yes' or 'no' answer as to what cracks need repair based on width and other factors.
In general, cracks wider than a credit card and running through the depth of the concrete are structural in nature and could be a sign of more serious problems (see Concrete Crack Repair Evaluation). These cracks -- no matter what the width -- are rarely acceptable. Consult an engineer or concrete repair professional to determine the cause of the crack and to recommend the best repair solution. https://bhaqblq.weebly.com/blog/spelling-stairs-template.
For hairline or non-structural cracks in concrete, the answer as to what’s acceptable is less clear. The width at which they became a problem requiring repair often depends on the following factors:
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Be aware that if you decide to repair the crack, the repair itself is likely to be visible unless you cover it with an overlay. However, it’s often possible to disguise or accentuate a crack through sawcutting, staining and other techniques. (See Incorporating Cracks in Concrete Floor Design.)
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A single circular section column will be analyzed with RCsolver. The following data is available:
a) Section properties: R = 0.25 m, c = 50 mm, concrete: C25/30, Reinforcement steel: B500C, proposed tensile reinforcement: Ø16, proposed shear reinforcement: Ø10, number of stirrup legs: 4.
b) Column properties and loading: h = 3 m, Mtop,y = 90 KNm, Mtop,z = 100 KNm, Mbot,y = -110 KNm, Mbot,z = -120 KNm, Vy = 90 KN, Vz = 50 KN, Ntop = 400 KN (compression), Nbot = 480 KN (compression).
Objective: Design the concrete column and calculate the required tensile and shear reinforcement.
Figure 1: Column section properties
Figure 2: Column properties and Column loading
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Figure 3: 3D model, concrete column and reinforcement rebars
Figure 4: Results in RCsolver
Figure 5: Moment – Axial force interaction diagram
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