What is the maximum distance on center for anchoring exterior egress stairways in Seismic Design Category D structures?

In Seismic Design Category D, the requirements for anchoring exterior egress stairways are critical to ensure structural integrity during seismic events. The maximum distance on center for anchoring these stairways is set at a minimum of 8 feet. This requirement ensures that the stairways are adequately secured to withstand potential seismic forces that could cause lateral movement or destabilization. By maintaining this distance, the design addresses the need for both safety and structural performance, which is essential in regions prone to earthquakes. This specific anchoring requirement helps prevent hazardous situations where an improperly anchored stairway could collapse, providing a safe means of egress for building occupants during an emergency.