Distributed Loads Applications

Examples of handling common continuous loads in architectural design.

Example

A simple 8m8\text{m} long concrete beam carries a massive uniform load (UDL) of 10 kN/m10 \text{ kN/m} continuously across its entire span. Determine the exact magnitude and exact location of the single equivalent point load that replaces this distributed load for equilibrium calculations.

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Equilibrium of a Simple Beam

An example problem demonstrating the practical calculation of support reactions.

Example

Imagine a 10-meter beam supported perfectly by a pin on the left (Point A) and a roller on the right (Point B). This is statically determinate (2+1=32+1=3 unknowns). A massive 50 kN downward gravity force is applied exactly 2 meters away from Point A. Determine the exact support reactions.

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Architectural Beam Equilibrium

50 kN
30 kN
0.0 kN
Reaction A
0.0 kN
Reaction B

Load 1 (Left)

Position: 2 m(0 - 10 m)
Magnitude: 50 kN(0 - 100 kN)

Load 2 (Right)

Position: 8 m(0 - 10 m)
Magnitude: 30 kN(0 - 100 kN)
Key Takeaways

Checklist

Complex Loading and Determinacy

Calculating support reactions for non-uniform loads and evaluating structural stability.

Example

A deep basement retaining wall is subjected to horizontal hydrostatic water pressure from saturated soil. The pressure forms a Uniformly Varying Load (UVL) starting at 0 kN/m0 \text{ kN/m} at the top of the 6-m6\text{-m} tall wall and increasing linearly to a maximum intensity of 60 kN/m60 \text{ kN/m} at the bottom base. Determine the exact magnitude and location of the single equivalent point load (PP).

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Example

A 6-m6\text{-m} long horizontal beam is perfectly supported by a pin at the left end (Point A) and a roller at the right end (Point B). It carries a triangular UVL that starts at 0 kN/m0 \text{ kN/m} at Point A and peaks at 30 kN/m30 \text{ kN/m} exactly at Point B. Calculate the vertical support reaction at the pin (AyA_y).

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Example

A heavy concrete floor slab is supported continuously by four equally spaced steel columns. The connections at the tops of all four columns behave like rigid built-in (fixed) supports to the slab. Is this single floor span statically determinate or statically indeterminate? Verify mathematically.

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Conceptual Case Studies

Identifying special equilibrium conditions without complex math.

Example

An engineer is analyzing a complex lattice of slender diagonal steel rods supporting a glass facade. No external forces act anywhere along the length of the rods; forces are only applied at the pinned connection joints at the very ends. How does this simplify the analysis?

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Example

A crane lifts an oddly shaped, asymmetrical precast concrete panel using exactly two vertical cables attached to the top corners. Gravity pulls down on the panel's exact center of mass. The panel hangs perfectly motionless in the air. What geometric rule must be true regarding these three forces?

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