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Zorluk: ZorStructural Components

In a tied-arch bridge assembly (often called a bowstring arch), the horizontal structural member connecting the lower ends of the arch primarily functions as a compression strut to prevent the ends of the arch from collapsing inward under a heavy downward load.

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False
The statement is false because the horizontal member in a tied-arch bridge must resist the outward thrust of the arch. Therefore, it pulls inward and is subjected to tension, functioning as a tie rather than a compression strut.

Adım Adım Çözüm

1
Analyze the load distribution and reaction forces in a standard arch structure.
When a downward vertical load is applied to an arch, the geometric shape redirects the forces along its curve, resulting in a strong outward horizontal thrust at the base supports.
Understanding the fundamental directional forces generated by an arch is necessary to determine what counter-forces are required for equilibrium.
2
Determine the required structural function of the horizontal connecting member.
Because the ends of the arch naturally tend to push outward away from each other, the horizontal member connecting them must actively pull inward to hold the ends together.
Structural components in a stable assembly must provide reaction forces that directly oppose the applied loads.
3
Identify the type of internal stress created in this horizontal member.
A structural member that pulls inward against an outward spreading force is being stretched. This means it experiences tensile stress, acting as a tie.
This confirms the member acts as a tension tie, directly contradicting the claim that it is a compression strut.

Anahtar Kavram

Tension and Compression in Arch Structures
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Konular

Structural Components

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