Why do we calculate slope and deflection in beams under applied loads? What is the real life applica

Structural Analysis (Calculating slope deflection) gives us theoretical representation of beam after the application of load.

Deflection gives us value (distance) to which the beam will deflect after the application of load.

Whereas Slope define how the it going to deflect after application of load (shape of bend/deflection)

So the reason behind calculating slope and deflection is to know how the beam will bend and to which extent.

Except the design purpose, the slope and deflection helps us get to know how the beam will behave after load application and decide its position relatively to other members according to the behaviour of beam. And it also helps in deciding other architectural designs.

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