For a simply supported beam carrying a moving concentrated load, the influence line for shear at an interior section has a
Correct answer: A. vertical jump at the section
- A. vertical jump at the section
- B. constant value over the span
- C. continuous parabolic shape
- D. zero value throughout the span
Explanation
The shear force changes abruptly as the moving load crosses the section, so its influence line has a vertical jump there. The ordinates on the two sides are generally different.
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About Structural Analysis
Structural analysis determines how beams, frames, trusses and arches carry loads through reactions, shear forces, bending moments, axial forces and deflections. It covers free-body diagrams, equilibrium equations, determinacy, influence lines and methods such as slope deflection, moment distribution and virtual work, while distinguishing analysis of a structure from its design.
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