Building Code Standard

ASCE 7-16 Wind Load Overview

The official rulebook for calculating wind loads. Here is a plain-language guide to what it says and how to use it for Miami-Dade projects.

Wind Load Chapters (26-30)

General

Definitions, wind speed maps, exposure categories

MWFRS Part 1

Directional procedure for buildings

MWFRS Part 2

Envelope procedure for low-rise

C&C

Components and cladding pressures

Wind Speed

Velocity Pressure

GCp

Pressure Coefficient

Design Pressure

ASCE 7-16

Minimum Design Loads and Associated Criteria for Buildings and Other Structures

2016

Edition

ASCE

Publisher

The Wind Load Rulebook

ASCE 7 is published by the American Society of Civil Engineers. It is the standard that tells engineers exactly how to calculate wind loads, earthquake loads, snow loads, and more.

The "16" means the 2016 edition (though updates come out every few years). Florida Building Code references ASCE 7, making it legally required for all structural design in the state.

Think of ASCE 7 as a recipe book. It gives you the ingredients (wind speed, exposure, building shape) and the steps to combine them into the final answer (design pressures).

For Miami-Dade specifically, ASCE 7-16 provides the 180+ mph wind speeds and the procedures to convert those speeds into actual forces on your building.

The Calculation Process

ASCE 7-16 breaks wind load calculations into clear steps. Each step builds on the previous one.

Step 1: Determine basic wind speed (V) from the maps based on your location and Risk Category.

Step 2: Calculate velocity pressure (qz) using the formula with all adjustment factors.

Step 3: Select pressure coefficients (GCp or Cp) based on building shape and surface location.

Step 4: Combine velocity pressure and coefficients to get design pressures (p).

The result is a number in pounds per square foot (psf) that tells you exactly how much force each part of your building must resist.

V = 180 mph (Miami-Dade, RC II)

Look up wind speed from Figure 26.5-1

qz = 0.00256 x Kz x Kzt x Kd x Ke x V^2

Calculate velocity pressure per Eq. 26.10-1

GCp from Tables/Figures

Select coefficients for your surface

p = q(GCp) - qi(GCpi)

Calculate net design pressure

MWFRS

Overall building frame
Shear walls
Roof diaphragm
Foundation loads
Lower pressures
Larger tributary areas

C&C

Windows and doors
Wall panels
Roof covering
Fasteners
Higher pressures
Smaller tributary areas

Two Types of Loads

ASCE 7-16 separates wind loads into two categories because different parts of buildings experience wind differently.

MWFRS (Main Wind Force Resisting System): This is the structural skeleton - beams, columns, shear walls. These elements carry the total wind force on the building and transfer it to the foundation.

C&C (Components and Cladding): Individual pieces like windows, wall panels, and roof shingles. These see localized peak pressures that can be much higher than the average pressure on the whole wall.

A window must resist the worst pressure that hits its small area. The building frame only needs to resist the average pressure over large areas. That is why C&C pressures are typically higher.

Frequently Asked Questions

What is ASCE 7-16 and why does it matter? +

ASCE 7-16 (Minimum Design Loads and Associated Criteria for Buildings and Other Structures) is the standard that defines how to calculate wind loads. It is referenced by the Florida Building Code and required for all structural design in Miami-Dade County.

What chapters of ASCE 7-16 cover wind loads? +

Chapters 26-30 cover wind loads. Chapter 26 provides general requirements and definitions. Chapter 27-28 cover Main Wind Force Resisting System (MWFRS). Chapter 29 covers other structures. Chapter 30 covers Components and Cladding (C&C).

What is the difference between MWFRS and C&C? +

MWFRS (Main Wind Force Resisting System) includes the structural frame that resists overall building forces. C&C (Components and Cladding) includes individual elements like windows, doors, and roof panels. C&C pressures are typically higher because they must resist localized peak pressures.

Does Miami-Dade have requirements beyond ASCE 7-16? +

Yes, the High Velocity Hurricane Zone (HVHZ) in Miami-Dade has additional requirements beyond standard ASCE 7-16. These include mandatory impact protection for glazing, specific product approvals (NOA), and enhanced testing requirements for building components.

Get ASCE 7-16 Compliant Wind Loads

Our calculator follows all ASCE 7-16 procedures automatically. Get accurate MWFRS and C&C pressures for your Miami-Dade project in seconds.

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