Load Factor Resistance Design (LRFD)

Load Factor Resistance Design (LRFD) is an engineering approach used to ensure structures like bridges and buildings are safe and reliable. It combines estimated loads, such as weight or forces, with safety margins called load factors, and compares these to the structure’s strengthened capacity, adjusted with resistance factors. This method accounts for uncertainties in loads and material strength, ensuring the design can withstand unexpected conditions while maintaining efficiency. Essentially, LRFD balances safety and economy by designing structures strong enough to handle ultimate loads with appropriate safety margins.