## Introduction

This calculator does wind loading analysis for buildings and structures. It is split into five sub-sections depending on application. For each, wind pressure coefficients and parameters are selected or calculated in order to compute the net design wind pressures.
This calculation has been written in accordance with ASCE 7-10. An updated revision, ASCE 7-22 exists. Any discrepancies between the two revisions are noted.

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## Explanation

Buildings and their components must be designed to withstand code-specified wind loads. Wind load is the force exerted on a structure by the wind.
ASCE 7 provides methods for calculating the design wind pressure based on two categories of applications: the main wind force-resisting system (MWFRS) or components and claddings (C&C).
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### Design procedure

The process to calculate the wind load involves:
1. Determine the basic wind speed, V from the Basic Wind Speed Maps (ASCE 7-22 Figure 26.5-1A to 1D)
2. Determine site factors Kz and Kzt:
1. Velocity pressure exposure coefficient, Kz (ASCE 7-22 Table 26.10-1) based on your exposure classification and your reference height above ground
2. Topographic factor, Kzt (ASCE 7-22 Table 26.8-1) based on your distance to hills and escarpments.
❗The ground elevation factor, Ke is a new factor in ASCE 7-22. It is not considered in this calculator, though ASCE 7-22 permits Ke = 1 for all elevations and so the calculator is still valid.
1. Calculate the velocity pressure, qz (ASCE 7-22 Equation 26.10-1)
1. Determine the internal pressure coefficient, GCpi (ASCE 7-22 Table 26.13-1) based on your enclosure classification.
2. Calculate the design wind pressures, p. The equation varies slightly depending on the method used and if you are considering the MWFRS or C&C. See below section for more details.

### Analysis methods

ASCE 7-10 provided two methods to calculate the design wind pressures: a simplified procedure and an analytical procedure. ASCE 7-22 has removed the simplified method. This calculator is based on the ASCE 7-10 analytical procedure that is still valid in ASCE 7-22.
ASCE 7-22 provides four separate chapters for determining the design wind pressures, based on application:
1. Chapter 27: Wind loads on MWFRS using the Directional Procedure. This method applies to buildings of all heights in which it is necessary to separate applied wind loads onto the windward, leeward and sidewalls of the building to properly assess the internal forces in MWFRS members.
1. Chapter 28: Wind loads on MWFRS using the Envelope Procedure. This method applies to low-rise buildings that have a flat, gable or hip roof.
1. Chapter 29: Wind loads on building appurtenances (such as roofs) and other structures (such as freestanding walls and chimneys) using the Directional Procedure. Note, not included in this calculator.
1. Chapter 30: Wind loads on C&C. Includes Part 1 to 5 depending on your application: Part 1 for Low-Rise Buildings. Part 2 is for buildings with h> 60ft, Part 3 is for Open Buildings, Part 4 includes Building Appurtenances, Rooftop Structures, and Equipment and Part 5 includes non-building structures like silos and tanks.

### Parameters

Wind loading analysis in all five sub-sections of this calculator involve the following input parameters.

### Basic Wind Speed Maps, V

❗The wind speed maps in ASCE 7-22 and ASCE 7-10 differ slightly. Use the figures from ASCE 7-22 in this calculation, as provided below.

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