Modal response spectrum to ASCE 7-22 12.9.1
Modal response spectrum analysis of a stick model: periods, mass participation, SRSS or CQC, scaling to the ELF base shear, story forces and drifts.
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What you get
From the inputs to a finished modal response spectrum calculation
Every step shown
Each result with its equation, the values that go into it and, where there is one, the code section. Results update as you type.
A calculation report a reviewer can follow
Inputs and every step with its result and reference, in a clear PDF with your title block.
Drawings
Where the calculation has a shape to draw: elevations, sections and the diagrams, on a sheet with your title block, as PDF or DXF.
Your units, your method
US or metric units at any time, LRFD or ASD where the code offers both; the report follows.
Verification
How the modal response spectrum is tested
Against hand calculations from the code equations, on every change. The method and the sources.
Learn
Step by step
User manual: Modal response spectrum analysis
Every input, check and option of the calculation explained.
Video: Loads: a takeoff and a load combination table
Loads tools have no pass or fail: a floor beam takeoff with live load reduction, and every combination of your load effects. (1:47)
More loads calculations
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