ORS 455.645

In order to safeguard life, health and property, all drawings and plans defining the framing systems, shoring systems and foundations for structures of public assembly shall be certified by a qualified professional engineer or qualified architect. The design of the certified structure of public assembly shall provide for resistance to lateral forces, including wind and earthquakes, as well as gravity loads, in accordance with accepted engineering practice and governing building codes. The design shall be accompanied by supporting lateral force calculations.