The stiffness of the member is effected by its Young’s modulus “E”, as well as its Second Moment of Area “I”. This results in a simple bending stress distribution in the cross-section with tension in one half of the member and compression in the other half… Stress distribution of a simple rectangular uncracked concrete member in bending. This means that the section is un-cracked and therefore the full cross-sectional area is effective. The Mechanics of Cracking in Concrete Membersīefore jumping into our FEA analysis software, lest touch on a very basic first principles concept.Ĭonsidering a very simple rectangular concrete member in bending, cracking does not occur at low levels of loading. Although steel reinforcing is generally provided in concrete members to support tension forces, the process of concrete cracking can significantly reduce the stiffness of the member. This article explores how to model cracked shear wall behaviour in ETABS using stiffness modification factors.Ĭracking occurs in concrete when the tensile forces within the concrete member exceed the tensile capacity of the concrete due to a combination of tension, bending and shear forces. Death, taxes and concrete cracking… right? Modelling cracked behaviour of concrete is an important step to ensure that your analysis is accurate and a true representation of the real life behaviour of your structure. There are certain things that are unavoidable in life.
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