A request was received to provide additional guidance on what limit state the guardrail loads should be held to, since the load values are clearly specified; specifically, whether the loads would allow a guardrail to yield, or reach the ultimate limit state. Discussions indicated that the limit state would depend on the specific case, for example some guardrails can be permitted to deflect until a near ultimate limit state (such as catwalks where deflection does not enter the ride path)k, while others cannot because they are restricted (such as guardrails near a station platform clearance and reach envelope). This language is intended to clarify this by requiring that the engineer select the correct limit state based on the ride analysis, with the specific examples listed above provided in the appendix for reference.
Developed by Subcommittee: F24.24
Staff Manager: Katerina Koperna
Date Initiated: 02-03-2022
Technical Contact: Christian Noveral