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TTL, Inc.

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Mr. Douglas Bell, P.E., M.ASCE

TTL, Inc.

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RE: Inquiry About MCER Design Spectra for Different Site Classes from ASCE Hazard Tool for ASCE 7-22

Posted By Douglas Bell 04-13-2026 02:09 PM
Found In Egroup: Professional and Career Topics \ view thread
Thank you, Daniel. ------------------------------ Douglas Bell P.E., M.ASCE Principal Engineer TTL, Inc. Nashville TN ------------------------------

Inquiry About MCER Design Spectra for Different Site Classes from ASCE Hazard Tool for ASCE 7-22

Posted By Douglas Bell 04-07-2026 05:56 PM
Found In Egroup: Professional and Career Topics \ view thread
Hello everyone, I have recently discovered the hazard tool sometimes produces a Multi-Period Design Spectrum (MPDS) for a "bad" site class that has lower spectral accelerations than the MPDS for a "good" site class when using ASCE 7-22. This does not make sense to me. See below for a comparison for ...