Jab hum kisi building ka design start karte hain, tab exact calculation se pehle ek approx beam size (depth) decide kiya jata hai jise pre-dimensioning kehte hain.
📌 Basic Formula:
👉 h = L / 10
(Yani beam ki height ≈ span ka 1/10 hoti hai)
📊 Example (as per image):
✔️ 3 m span → 25 cm depth
✔️ 3.6 m span → 35 cm depth
✔️ 4.5 m span → 45 cm depth
✔️ 5.4 m span → 55 cm depth
📌 Is rule ka use kyu hota hai?
✔️ Fast estimation ke liye
✔️ Initial design decide karne ke liye
✔️ Structure ko safe aur economical banane ke liy
📌 Important baat:
Ye sirf ek thumb rule hai, final design hamesha proper structural calculation ke baad hi fix kiya jata hai.
👉 Beam ka sahi size na hone par:
❌ Excess deflection ho sakta hai
❌ Cracks aa sakte hain
❌ Structure weak ho sakta hai
👉 Isliye pre-dimensioning samajhna civil engineers ke liye bahut zaroori hai.
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