Calculating Wind Loads on Buildings Using the Envelope Procedure of ASCE 7-22 Code

In Calculating Wind Loads on Buildings Using the Envelope Procedure of ASCE 7-22 Code, you'll learn ...

• The concept of wind loads and the importance of compliance with ASCE 7-22
• The differences between the Envelope and Directional Procedures, including when each is appropriate
• Major code updates from ASCE 7-16 to ASCE 7-22, including changes to wind speed maps, wind-borne debris region definitions, and external pressure coefficients for gable and hip roofs.
• The step-by-step process of determining risk categories, wind speed, site exposure factors (Kz, Kzt, Ke), and internal and external pressure coefficients.

Overview

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Credit: 2 PDH

Length: 35 pages

This course provides a comprehensive guide for engineers on determining wind pressures using a simplified, code-approved methodology specifically tailored for low-rise structures. It begins by introducing the concept of wind loads and emphasizes the importance of compliance with ASCE 7-22, the latest standard that aligns with the International Building Code (IBC).

The Envelope Procedure, covered in Chapter 28 of ASCE 7-22, is designed for buildings with a mean roof height of 60 feet or less and simple geometries. The method uses predefined external pressure coefficients and internal pressure classifications to calculate design wind pressures without needing directional analysis. The course highlights the differences between the Envelope and Directional Procedures, outlining when each is appropriate.

Major code updates from ASCE 7-16 to ASCE 7-22 are detailed, including changes to wind speed maps, wind-borne debris region definitions, and external pressure coefficients for gable and hip roofs. The course also reviews the step-by-step process of determining risk categories, wind speed, site exposure factors (Kz, Kzt, Ke), and internal and external pressure coefficients.

Using a full-length example of a low-rise commercial warehouse, the course walks users through calculations using ASCE 7-22 equations to determine design pressures on walls and roof zones. It concludes with a comparison of manual and software-assisted methods, reinforcing the accuracy of both. This course equips professionals to confidently apply the Envelope Procedure for wind load analysis and design.

Specific Knowledge or Skill Obtained

This course teaches the following specific knowledge and skills:

• The purpose and scope of ASCE 7-22 in relation to wind load design for buildings.
• The types of structures and conditions under which the Envelope Procedure is applicable.
• How to distinguish between the Envelope and Directional Procedures and determine when each should be used.
• The criteria used to classify a building as low-rise according to ASCE 7-22.
• How to determine site-specific wind parameters, including risk category, basic wind speed, and exposure category.
• How to apply the ASCE 7-22 methodology to calculate velocity pressure using the appropriate coefficients (Kz, Kzt, Ke).
• How to select internal and external pressure coefficients based on building geometry and enclosure classification.
• How to use ASCE 7-22 equations to compute design wind pressures on different building surfaces.
• How to analyze and interpret wind pressure zone maps and tables for gable and hip roofs in the context of Load Cases.
• How to verify manual wind pressure calculations using a software tool (e.g., Tekla Tedds) and compare results for accuracy.

Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 16 questions. PDH credits are not awarded until the course is completed and quiz is passed.