For the loaded continuous beam as shown below; which of the follo
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For the loaded continuous beam as shown below; which of the following statement(s) is/are correct with respect to the various types of shear cracks possible in a Beam?
A. Flexural and Flexure-shear cracks develop at the continuous support.
B. Web-shear cracks develop at the simple support.
C. Flexural cracks develop somewhere in the middle of continuous support and simple support.
D. Tensile splitting cracks develop and propagate across the direction of reinforcement in the Beam
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Right Answer is:
SOLUTION
Concept:
- In the mid-span of a continuous beam, the bending moment is generally very high and the shear force is very less. So; if we consider an element in this part, only vertical cracks develop and propagate. These cracks are called Flexural cracks.
- At simple (end) support, the shear force is very high and the bending moment is very less (∼ 0). Thus, the cracks develop diagonally and are generally Tensile in nature. These cracks are known as Web-Shear Crack.
- In between the continuous support and the mid-span of the Beam, where both shear force and bending moment have a substantial effect both; both flexural and web-shear cracks develop. These are collectively called as Flexural-shear cracks.
- Tensile splitting cracks propagate along the direction of the reinforcement, not across the direction of the reinforcement.
Important Point:
Flexural, Web-shear and Flexural-shear cracks are primary cracks whereas the Tensile splitting cracks is categorized under the secondary crack.
