IBC SECTION 1613 EARTHQUAKE LOADS
Every structure, and portion thereof, including nonstructural components that are permanently attached to structures and their supports and attachments, shall be designed and constructed to resist the effects of earthquake motions in accordance with ASCE 7, excluding Chapter 14 and Appendix 11A. The seismic design category for a structure is permitted to be determined in accordance with Section 1613 or ASCE 7.
ASCE STANDARD ASCE/SEI 7-10 American Society of Civil Engineers
Minimum Design Loads for Buildings and Other Structures
22.214.171.124.2 SEISMIC DESIGN CATEGORIES D THROUGH F
Acoustical tile or lay-in panel ceilings in Seismic Design Categories D, E, and F shall be designed and installed in accordance with ASTM C635, ASTM C636, and ASTM E580, Section 5—Seismic Design Categories D, E, and F as modified by this section.