Rationale

The purpose of this work item is to bring the wind-borne debris requirements for Risk Category III structures into alignment with what is currently specified in ASCE 7. Since the separate wind speed maps were first introduced in ASCE 7-10, there has always been a requirement to use the appropriate Risk Category map for proper determination of the wind-borne debris regions and wind zones that are then used to select the missile level in Table 3 of E1996. Section 26.12.3.1 of ASCE 7-22 states: “For Risk Category II buildings and other structures and Risk Category III buildings and other structures, except health care facilities, the wind-borne debris region shall be based on Figure 26.5-1B. For Risk Category III health care facilities, the wind-borne debris region shall be based on Figure 26.5-1C. For Risk Category IV buildings and structures, the wind-borne debris region shall be based on Figure 26.5-1D.” Figure 26.5-1B is the wind speed map for Risk Category II structures, Figure 26.5-1C is the wind speed map for Risk Category III structures and Figure 26.5-1D is the wind speed map for Risk Category IV structures.