Laserfiche WebLink
7.0 Design Loads - Seismic (Cont.): <br />7.3.1 Seismic Displacement of Unattached Solar Arrays: <br /> <br />Per ASCE 7-16, Section 13.6.12, the use of non-linear response history(NLRH) analysis is <br />permitted to determine the seismic displacement of non-structural components located on <br />the roof. <br /> <br />μ =specific to each array, see table 7.3 <br />Roof Pitch :specific to each array, see table 7.3 <br />lp =1 for all arrays <br />le =1 for all arrays <br /> <br />PanelClaw, Inc. has engaged the services of a 3rd party consulting engineer to perform <br />NLRH analysis on its clawFR and clawFRplus product. Utilizing that analysis, and the <br />report contained in the Appendix of this package, we are able to determine the displacement <br />of the arrays during seismic events, for the system design life of 25 years. The distance, <br />called Δ MPV, noted below represents the displacement due to the maximum seismic event <br />with a 700 year MRI. The Δ MPV also incorporates the cumulative displacements, over the <br />arrays design life, of smaller seismic events. As a company policy, PanelClaw, Inc., limits <br />the use of this data to Δ MPV displacement of 48" or less. <br /> <br />ΔMPV distances are derived from App. B, "Executive Summary: Seismic Displacement <br />Demand of Unattached (ballast-only) Solar Arrays." <br /> <br />Using the ΔMPV value above, ASCE 7-16 has adopted the following equations to set the <br />minimum separation between unattached solar arrays and rooftop obstructions. Table 7.3 <br />below lists the required separation. <br /> <br /> <br />ARRAY CLEARANCES PER ASCE 7 <br />Condition #Condition Description Minimum Separation Equation <br />1 Between separate solar arrays of similar construction (0.5)(Mpv) <br />2 Between a solar array and a fixed object on the roof or solar array of different construction (Mpv) <br />3 Between a solar array and a roof edge with a qualifying parapet (Mpv) <br />4 Between a solar array and a roof edge without a qualifying parapet (2.0)(Mpv) >= 4 ft <br />NOTE: YOU SHOULD PROVIDE SUFFICIENT SLACK IN ARRAY ELECTRICAL WIRING TO ACCOMMODATE ALL POTENTIAL ARRAY MOVEMENT. <br /> <br />11/04/2024 <br />APPROVED FOR CONSTRUCTION <br />15 <br />PanelClaw, Inc., 1600 Osgood Street, Suite 2023, North Andover, MA 01845 <br />(978) 688.4900 - www.panelclaw.com <br />1330 E Seventeenth <br />St4/10/2025