40ft x 12ft modular clinic (Risk Category IV). Location: Charleston, SC (Wind Speed: 170 mph ultimate, Exposure D near coast). Challenge: The unit must move to a new FQHC site every 6 months.
Use the ASCE Hazard Tool (ascehazardtool.org) to obtain the site‑specific, risk‑category‑adjusted 3‑second gust wind speed based on the structure’s location.
If the portable building sits on a temporary concrete slab, chemical or mechanical anchors are embedded into the concrete to secure the chassis straps. asce 7 22 portable
Perfect for quick reference in the field or during plan reviews. Not a replacement for the official ASCE 7-22 for licensed design work. If you’re a PE doing final calculations, stick with the full version. Contractors and inspectors will love the portability.
ASCE 7-22 represents a significant leap forward from ASCE 7-16, introducing crucial updates—including the first-ever design criteria for tornadoes. Having this information in a "portable" format—whether digital, searchable, or cloud-based—is not just a convenience; it is essential for efficiency, safety, and compliance in the field. What is ASCE 7-22? 40ft x 12ft modular clinic (Risk Category IV)
Portable structures encompass any factory-assembled or field-erected building designed to be relocated multiple times over its service life. Common examples include: and temporary school extensions. Mobile office trailers used on construction sites. Industrial tent enclosures and fabric structures. Emergency medical units or disaster-relief housing.
This classification is echoed throughout industry literature. Assigning a portable structure to Risk Category I carries significant design implications: it generally permits the use of a lower basic wind speed and reduced importance factors compared to structures in higher categories. In practical terms, a temporary classroom or a construction site office that falls under Risk Category I will be designed for a less severe wind event than a permanent hospital (Risk Category IV) or a school (Risk Category III), reflecting the lower occupancy and reduced consequences of a failure during the structure’s limited service life. Use the ASCE Hazard Tool (ascehazardtool
The portability of a structure does not exempt it from the laws of physics, nor the letter of the code. is clear: If people occupy it, the roof must stay on, whether the foundation is poured concrete or a parking lot tie-down.