🏢

Structural Frame Deflection Simulator

Portal Frame · Lateral Drift · Deflected Shape

✅

Drift within H/400 — PASS

Lateral drift Δ = 0.254 in ≤ allowable H/400 = 0.360 in (wind serviceability).

🏗️ Loading & Geometry

Lateral load P20 kip

Story height H12 ft

Bay width L24 ft

📐 Member Stiffness

Column inertia Ic300 in⁴

Beam inertia Ib500 in⁴

Modulus E29000 ksi

📊 Drift Results

Lateral drift Δ0.254 in

Drift ratioH/566

Stiffness ratio k0.833

Column base moment60.00 kip·ft

Allowable drift (H/400)0.360 in

Reference: Approximate single-bay fixed-base portal frame drift: Δ = PH³/(12EIc)·(2k+1)/(6k+1), k = (Ib/L)/(Ic/H). Drift limits per ASCE 7 / IBC: H/400 (wind serviceability) to H/200. For preliminary sizing only — use full frame analysis (matrix stiffness / FEA) for design.

Deflected Shape · Sway Magnified for Clarity

Undeflected frame

Deflected (swayed) frame

Lateral load P