explain why should the beams used in construction of bridges have large depth and small breadth?
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“ a large depth and small breadth” gives a beam a large second moment of area which in turn gives it a greater bending stiffness to loads in the vertical direction, which are the primary loads expected on most bridges.
The beams used in construction of bridges have large depth and small breadth as it provides strength, stability, space and efficiency.
When the beams used in the construction of bridges have large depth and small breadth it ensures stability by distributing the weight load evenly. Furthermore, the depth of the beam provides resistance to bending, which is critical in a bridge structure and where heavy loads like vehicles and trains are constantly passing over it. On the other hand, a deeper beam can resist bending more effectively than a shallow beam, and therefore, can support a larger load.
Moreover, when a beam has a small breadth and large depth, it is more efficient in carrying heavy loads. The weight of the load is distributed along the length of the beam, and the wide base of the beam spreads the load evenly across the foundation. Additionally, a beam with a small breadth is less likely to buckle under heavy loads, which is an important safety consideration for bridge construction.
Overall, the combination of large depth and small breadth provides the necessary strength and stability to withstand the heavy loads and environmental factors that bridges encounter over time.
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