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Breslau’s principle. . El is constant.
Draw the influence line diagram for the propped reaction of a propped cantilever beam having span 6 m .
Take constant.

Ask by Morgan Norton. in India
Jan 08,2025

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To draw the influence line for the reaction at point B of a propped cantilever beam with a 6-meter span:
  1. Beam Configuration: Fixed at point A and simply supported at point B.
  2. Influence Line: A straight line from (0, 1) to (6, 0), where:
    • At 0 meters (point A), the reaction at B is 1.
    • At 6 meters (point B), the reaction at B is 0.
  3. Graph: Plot this line on a graph with the x-axis representing the beam length and the y-axis representing the reaction at B.
This line shows how the reaction at B changes as a unit load moves along the beam.

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Extra Insights

To create the influence line diagram for the propped reaction of a propped cantilever beam, first, understand that the beam spans 6 m, with point A fixed and point C propped. The reaction at the propped support (let’s call it R_C) can be influenced by moving a unit load across the span.
As the load moves from point A to point C, the influence line for R_C will be shown to rise linearly as the load approaches C. When the load is directly at A, the influence on the reaction R_C is zero, while at B, it reaches a maximum. As the load moves towards C, the influence starts to drop back down. This creates a triangular influence line, peaking as it approaches the propped support.
Drawing this, it’s essential to mark the positions of A, B, and C on the influence line, plotting the force contribution from each section. You’d have a rising slope from point A (0 m) to B (3 m) and then a declining slope from B (3 m) downwards to C (6 m).
Next, this diagram provides insights into the behavior of prestressed beams, highlighting how various placements affect the overall bending moments and shear. This concept reflects the fundamental principles of structural analysis and is vital in engineering applications where understanding the distribution of forces is crucial for design integrity.

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