ASCE 7-16 has expanded on the definition of component & cladding wind 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 …
Per ASCE 7, the Mean Roof Height (h) is defined as the average of the roof eave height and the height to the highest point on the roof surface, except that, for roof angles of less than or equal to 10°, the mean roof height is permitted to be taken as the roof eave height. Visually, AAMA TIR …
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 …
What are the requirements for using ASTM Missile Level E in Florida (2021 updated)? Read More »
The directionality factor (Kd) used in the ASCE 7 wind load provisions for components and cladding is a load reduction factor intended to take into account the less than 100% probability that the design event wind direction aligns with the worst case building aerodynamics. Per ASCE 7-16,Section 26.6, the Directionality Factor Kd is defined as …
A canopy is a structure which provides overhead protection from the elements such as rain, snow, or sunlight. Canopies can be attached to a structure or they can be free standing with their own supports. They can be constructed of a variety of materials including steel, concrete, aluminum, wood, or even fabric. According to ASCE …
What is a canopy awning & which wind forces should I use to design? Read More »
INTRODUCTION The main purpose foundations serve is to distribute and resist the forces or loads experienced by the host structure due to wind, rain, snow, seismic, & other load conditions. When it comes to building components such as generators, signs, and fences the code leaves a gray area for foundation design. This happens because most …
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 …
ASCE 7 Main Wind Force vs. Components & Cladding Explained (MWFRS vs. C&C) Read More »
Wind Exposure Category Overview ASCE-7 is the governing referenced standard for design loads on buildings & other structures for building codes throughout the US. ASCE 7 (26.7 of ASCE 7-16) describes the process to which wind speed is converted into wind pressure to design such structures. The formula is based on many variables. One of …
ASCE 7 WIND EXPOSURE CATEGORIES AND HOW EXPOSURE ‘D’ WORKS Read More »
The answer varies with location and type of building. There are several ‘risk categories’ associated with a location that determine what wind speed to use. A building that’s a risk category I for example has a lower wind speed requirement than a more important risk category II or III building. We explain risk categories here. …
Risk Category 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 …
From the 5th, 6th &7th Edition of the Florida Building Code (2014, 2017, 2020) section 1603.1.4 as well as from section 1603.1.4. of the 2012, 2015, & 2018 International Building Code, construction documents shall show the following: Ultimate design wind speed, Vult (3-second gust), miles per hour and nominal design wind speed (Vasd) as …
What wind information is required for construction documents? Read More »
ASCE 7-10, ASCE 7-16 Wind Pressure Information and Wind Pressure Calculators 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 …
ASCE Wind Speed Risk Category To Use with Signs & Building Components On-Off Buildings Read More »
GLOSSARY OF ENGINEERING TERMS These terms are published by Engineering Express to coincide with help menus for our online tools & published articles and as they relate to the Building Component Design industry. See also our FLOOD ENGINEERING GLOSSARY for more terms related to flood engineering. See Also SUNROOM TERMINOLOGY for a list of Sunroom …
FLOOD GLOSSARY The following is provided as a curated summary of terms taken from the referenced standards that appear in the article footing. SEE ALSO OUR GENERAL GLOSSARY OF TERMS NATIONAL FLOOD INSURANCE PROGRAM (NFIP) The Federal program, create by an act of Congress in 1968, that makes flood insurance available in communities that enact …
An engineer’s walk through of the design requirements for flood resistant design of building components With Engineering Express’s early start with floodproofing designs for floor barriers and exterior glazing in projects across the US, we quickly became experts in this field. We’ve witnessed and directed static and dynamic flood testing, sat on industry meetings, met …
Flood Resistant Design & Floodproofing of Buildings Read More »
Many don’t understand how wind works & state that a product is rated to a specific wind speed. This is false advertising & not true. There’s no such thing as “Rated to XXX MPH wind” This is frequently seen in marketing materials which is a false & misleading statement that comes with many unwritten …
