In case of structural concrete members subjected to torsion, shear str...
In the case of structural concrete members subjected to torsion, shear stresses develop depending upon the type of cross section and magnitude of torque, the shear stresses in association with the flexural stresses may give rise to principal tensile stresses, the value of which when it exceeds tensile strength of the concrete results in the development of cracks on the surface of the member.
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In case of structural concrete members subjected to torsion, shear str...
The correct answer is option 'D': Type of cross section.
When a structural concrete member is subjected to torsion, shear stress develops within the member. This shear stress is influenced by the type of cross section that the member has. Here is an explanation of why the type of cross section affects shear stress:
1. Cross-sectional shape:
The shape of the cross section determines the distribution of stress within the member. Different cross-sectional shapes have different resistance to shear stress. For example, rectangular cross sections have a uniform distribution of stress, while circular cross sections have a higher resistance to shear stress due to their symmetrical shape.
2. Reinforcement arrangement:
The arrangement and distribution of reinforcement within the cross section also play a crucial role in resisting shear stress. Reinforcement, such as stirrups or shear reinforcement, is added to increase the shear capacity of the member. The spacing, size, and quantity of reinforcement bars affect the distribution and magnitude of shear stress.
3. Torsional moment:
The torsional moment applied to the member also affects the development of shear stress. The torsional moment is the twisting force that causes the member to undergo torsion. It is affected by factors such as applied loads, member geometry, and boundary conditions. The magnitude and distribution of shear stress depend on the torsional moment acting on the member.
4. Shear transfer mechanisms:
The type of cross section also influences the shear transfer mechanisms within the member. Shear transfer mechanisms include aggregate interlock, dowel action, and bond between concrete and reinforcement. The effectiveness of these mechanisms depends on the cross-sectional shape and the surface area available for shear transfer.
In conclusion, the type of cross section significantly affects the development of shear stress in structural concrete members subjected to torsion. The cross-sectional shape, reinforcement arrangement, torsional moment, and shear transfer mechanisms all depend on the type of cross section, making it the correct answer to the given question.
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