Tags: wind

ASCE 7 Wall Zones Explained

ASCE 7-16 has expanded on the definition of component & cladding zones from previous ASCE 7 standards   Per ASCE 7-16, buildings are composed of 5 different zones, depending on the wind loading they are subjected to. Zones ‘4’ & ‘5’ relate to wall zones & are defined as follows: Zone 4: Any areas between …

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About ASTM E1996-17 Missile Levels

Overview As of the 2020 Florida Building Code & 2018 International Building Code, ASTM E1996-17 is the adopted reference standard.  The title is ‘Standard Specification for Performance of Exterior Windows, Curtain Walls, Doors, & Impact Protective Systems Impacted by Windborne Debris in Hurricanes’. (Exterior garage doors & rolling doors are covered by ANSI/DASMA 115 & …

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What are the requirements for using ASTM Missile Level E in Florida (2021 updated)?

In the 7th Edition Florida Building Code (2020), missile level E is valid in and outside of the HVHZ (Broward and Dade Counties) when it came to essential facilities.   You can find information in section FBC 1626.2.4 which is under the HVHZ (Dade & Broward Counties) but FBC section 449.4.2.5.1 refers to FBC sections …

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ASCE 7 Least Horizontal Dimension

From ASCE 7 (10, 16 & previous standards):   The “Least Horizontal Dimension” can be taken as the shortest possible distance that can be taken between two parallel lines that fully encompass the building The Least Horizontal Dimension is further demonstrated as follows: Where ‘B’ is the Least Horizontal Dimension.    

ASCE 7 Basic Wind Speed

Per definition by ASCE 7-16 & ASCE 7-10, Section 26.2 is defined as:   BASIC WIND SPEED (V): Three-second gust speed at 33ft above the ground in Exposure C (see Exposure Categories) as determined in accordance with ASCE 7-16 (10) Section 26.5.1. The wind shall be assumed to come from any horizontal direction. The basic …

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The Updated Saffir-Simpson Scale

First, it needs to be said that there is a complicated formula that converts wind velocity to wind pressure.  Many wind pressure values can exist from a single wind velocity which vary based on roof height, topography, terrain, even code version, and more. The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 rating based …

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ASCE 7 Main Wind Force vs. Components & Cladding Explained (MWFRS vs. C&C)

ASCE 7 separates wind loading into three types: Main Wind Force Resisting System (MWFRS), Components and Cladding (C&C), and Other Structures and Building Appurtenances. MWFRS is defined as “(a)n assemblage of structural elements to provide support and stability for the overall structure.” Typically, members which receive loading from two surfaces are designed to resist MWFRS …

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ASCE Risk Categories Explained

Background Building codes require that buildings be classified by their level of importance in determining the risk taken with safety factors against their failure under critical design loads. Calculations for the structure’s overall stability, flexure, and fatigue are all based on the assumption of a given risk category design level.  ASCE 7 references risk category …

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Is a large missile impact window or door automatically approved for small missile impact?

Overview Changes to the 2020 Florida Building Code for Porous Impact Protection Devices Porous Impact Protective Systems: ASTM E1996-12A brought a significant change to Porous Impact Protective Systems (PIPS). A Porous Impact Protective System is defined as “An assembly whose aggregate open area exceeds 10% of its projected surface area”. Prior to ASTM E1996-12A, any …

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How to Find Wind Speed & Snow Using the Applied Technology Council Hazards by Location Website

The Applied Technology Council (ATC) offers site-specific information that is used in our calculators to determine the wind velocity. For the best results, the address of the site may be used. To find your wind speed, follow the step-by-step guide below.   Note:  Ground Snow Load can also be found from this tool, as well as …

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ASCE Wind Speed Risk Category To Use with Signs & Building Components On-Off Buildings

In terms of determining the risk category to a building component mounted to a building, the component ‘inherits’ the design properties of the structure. So a sign attached to a risk category II structure would be risk category II. If the sign is freestanding and not part of a main structure, while matching the risk …

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Calculator Glossary of Terms

Here’s a summary of our Online Calculator & General Terms. These terms are collected from numerous online sources published by Engineering Express & referenced to here. See also our FLOOD ENGINEERING GLOSSARY   LABEL GLOSSARY DESCRIPTION ADDITION ROOF TYPE For sunroom enclosures, roof types can be monoslope for studio, shed, or other single slope style …

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