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// CODE SNIPPET

A509.2.2.2 Combining 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 > A509.2.2.2 Combining Modes
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The peak displacements for each mode shall be combined by recognized methods. Modal interaction effects of three-dimensional models shall be considered when combining modal maxima.

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A509.2.2.2 Earthquake Hazard Reduction in Existing Concrete Buildings and Concrete With Masonry Infill Buildings, Combining Modes
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