PRODUCTS > FLEX-JOIST™
The Flex-Joist™ Gravity Overload Safety System™ offers additional safety features to building owners and managers who are concerned about potential overload conditions and the related risks of damage or injury. The system introduces several new advantages, as follows:
1. Early detection: Within a Flex-Joist Gravity Overload Safety System, each steel joist is engineered to flex in the event of an overload to establish the new element of time-delay before the collapse of a steel joist roof or floor structure. Strain gauges throughout the system measure ductile tensile yielding within the structure, detecting a problem early, well in advance of a collapse.
2. Notification: A steel joist overload condition can alarm locally and remotely. This simple safety solution can function as a stand-alone management package or be integrated into an existing building alarm system.
3. Overload location and status: Informed of the location of an overload, management can also “see” the estimated status of the overload. The system provides a measure of available response time, allowing for decisions as to evacuation, roof shoring and load removal.
Flex-Joists are designed for superior performance under unanticipated gravity loads in excess of engineered capacity. While not intended to outperform traditional joist systems under lateral or uplift load events such as a tornado, hurricane or seismic event, Flex-Joist design provides better protection in the more common overload scenarios such as rain, snow and floor live loads.
Flex-Joists differ in two fundamental ways:
1) Component relative strength ratios
2) Adjacent joist load sharing
In a Flex-Joist system, each joist component is designed with relative strength ratios, such that the joist can, in the event of extreme overload, experience ductile tensile yielding in the bottom chord and end webs.
Disclaimer: No joist will withstand sudden and catastrophic impact forces that exceed system capability. Flex-Joist design offers probability of high ductility and time delay under static gravity overload conditions.