题目
题目

Dashboard ENG2081: Mechanics of Structures 2A (2025-26)

数值题

A square section of side length [math: b] is subjected to a bending stress of [math: σ] \sigma = 5.4 MPa under a bending moment of [math: M]=6.8 kNm. Find the side length [math: b] of the square section. Provide your answer in mm, rounded to two decimal places.

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Question restatement: A square cross-section of side length b is subjected to a bending stress of σ = 5.4 MPa under a bending moment M = 6.8 kNm. Find b in mm, rounded to two decimals. Key formulas and relationships: - For a square section about its centroidal axis, the moment of inertia is I = b^4 /......Login to view full explanation

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Given a simply supported beam with length L =8.4m, and load W =7 kN, find the bending stress \sigma at the top of the section in the midspan of the beam, remember to show if this stress is compressive or tensile. The elastic modulus for the top is z_e =571733.2 mm^3 . Provide the answer in MPa (N/mm^2) rounded to two decimal places.

Given a simply supported beam with length L[math] L =8.4m, and load W[math] W =7 kN, find the bending stress σ[math] \sigma at the top of the section in the midspan of the beam, remember to show if this stress is compressive or tensile. The elastic modulus for the top is ze[math] z_e =571733.2 mm3[math] mm^3 . Provide the answer in MPa (N/mm^2) rounded to two decimal places.

Given a simply supported beam with length [math: L] =8.4m, and load [math: W] =7 kN, find the bending stress [math: σ] \sigma at the top of the section in the midspan of the beam, remember to show if this stress is compressive or tensile. The elastic modulus for the top is [math: ze] z_e =571733.2 [math: mm3] mm^3 . Provide the answer in MPa (N/mm^2) rounded to two decimal places.

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