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A509.2.2.1 Number of Modes

2010 Existing Building Code of NY > A5 Earthquake Hazard Reduction in Existing Concrete Buildings and Concrete With Masonry Infill Buildings > A509 Tier 3 Analysis Procedure > A509.2 Pseudo-Nonlinear Dynamic Analysis Procedure > A509.2.2 Description of Analysis Procedures > A509.2.2.1 Number of Modes

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At least 90 percent of the participating mass of the structure is included in the calculation of response for each principal horizontal direction.

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