Which statement about stress types in structures is true?

Which statement about stress types in structures is true?

• A. Only one type can be present at a time
• B. Stress types cancel each other
• C. Stress types are independent
• D. More than one type of stress may be present in a structure at the same time

Answer: (D)

Many structural members experience more than one kind of stress at once. Real-world loads don’t usually cause just a single effect; a beam, for example, can have bending stresses, axial (tension or compression) stresses, and shear stresses all present at the same location. These different stress components add together to produce the total stress state in the member, rather than canceling each other out. So you can have bending with tension on one side and compression on the other, while also carrying shear or torsion from other loads. This combination of stresses happening simultaneously is why the statement that more than one type of stress may be present in a structure at the same time is true.

Many structural members experience more than one kind of stress at once. Real-world loads don’t usually cause just a single effect; a beam, for example, can have bending stresses, axial (tension or compression) stresses, and shear stresses all present at the same location. These different stress components add together to produce the total stress state in the member, rather than canceling each other out. So you can have bending with tension on one side and compression on the other, while also carrying shear or torsion from other loads. This combination of stresses happening simultaneously is why the statement that more than one type of stress may be present in a structure at the same time is true.