Math Problem Statement

show the deflected shape of the beam

Show the deflected shape of the beam in the provided diagram.

Solution

To show the deflected shape of the beam in the given diagram, let's analyze the loading and support conditions:

Analysis of the Beam:

  1. Beam Type: The beam is supported by two fixed supports at points AA and DD.
  2. Loading Conditions:
    • A counter-clockwise moment of 5kN-m5 \, \text{kN-m} is applied at point BB.
    • A vertical point load of 8kN8 \, \text{kN} is applied downwards at point CC.

Deflection Shape:

  • Due to the moment at BB, the beam will tend to rotate counter-clockwise, causing the portion of the beam from AA to CC to curve downwards.
  • The point load at CC causes a downward deflection starting from that point, making the beam bend further downwards.
  • At fixed supports AA and DD, the deflection is zero, and the slope of the beam is constrained (no rotation).

Deflected Shape Description:

  • The left portion AA-BB will curve slightly upwards near AA, then deflect downwards as it approaches BB.
  • Between BB and CC, the beam will deflect downwards more prominently.
  • The segment from CC to DD will continue to deflect downwards but with a steeper curvature due to the applied point load.

The overall deflected shape will resemble a curve starting from AA, dipping at BB, and sagging significantly at CC before trying to return to zero deflection at DD.

Let me know if you need a visual representation of this, or have any further questions!


Further Questions:

  1. How do fixed supports impact the deflection and slope at the ends?
  2. What are the key differences in deflection shape for point loads versus applied moments?
  3. How does the location of the applied moment affect the beam’s deflection profile?
  4. What are the common deflected shapes for various beam loading scenarios?
  5. How can we calculate the maximum deflection and bending moment in the beam?

Tip: When dealing with deflections, it's essential to consider both the boundary conditions and the type of loads applied, as they significantly influence the final shape.

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Math Problem Analysis

Mathematical Concepts

Beam Deflection
Structural Analysis
Moment
Point Load

Formulas

Moment-area theorem
Euler-Bernoulli beam equation

Theorems

Superposition principle
Boundary condition theorem for beams

Suitable Grade Level

College Level - Structural Engineering