Pylon Wind Load Calculator — NSCP 2015 / ASCE 7-10

Input Parameters

Project Preset

Fills the form with the project’s drawing values; everything stays editable after loading.

Basic Wind Speed, V

kph

Jollibee (JFC) — also compute at 290 kph for comparison

When V ≠ 290 kph, a second full result block is generated using the JFC standard 290 kph.

Exposure Category

Sign Height, s

m (Jollibee typical: 3.4 m)

Sign Width, B

m (Jollibee typical: 3.0 m)

Epsilon, ε

Solidity ratio (0–1)

Topographic Factor, K_zt

Directionality Factor, K_d

0.85 for solid signs (NSCP Table 207A.6-1)

Sign-Head Mass, M_tip

kg — panel + frame + cladding, at the top of the mast

Damping Ratio, β

Used only on the flexible branch

Fundamental Frequency, n₁ (optional)

Hz — overrides the internal estimate. A modal extraction from MIDAS/ETABS outranks any built-in (NSCP §207A.9.6). n₁ < 1 Hz → flexible G_f (§207A.9.5).

Pylon Sections

Section	Width (mm)	Wall t (mm)	Height (m)

Heights must be ascending. Last row height = pylon height (h).

Enter the wall thickness on every row to have the fundamental frequency n₁ computed from the schedule (NSCP §207A.9.6). Leave blank to keep the rigid assumption.

Getting Started

Enter the design parameters on the left and click Compute Wind Load to run the analysis.

This calculator follows NSCP 2015 Section 207F and ASCE 7-16 Chapter 29 for computing design wind forces on solid freestanding pylon signs. The calculation includes:

Natural frequency classification (rigid / flexible)
Velocity pressure \( q_z \) profile
Gust effect factor \( G \) (rigid or flexible formulation)
Force coefficient \( C_f \) via bilinear interpolation
Design wind force for Case A (uniform) and Case B (eccentric)