// CODE SNIPPET
3404.5 Voluntary Seismic Improvements
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Alterations to existing structural elements or additions of new structural elements that are not otherwise required by this chapter and are initiated for the purpose of improving the performance of the seismic force-resisting system of an existing structure or the performance of seismic bracing or anchorage of existing nonstructural elements shall be permitted, provided that an engineering analysis is submitted demonstrating the following:
- The altered structure and the altered nonstructural elements are no less conforming with the provisions of this code with respect to earthquake design than they were prior to the alteration.
- New structural elements are detailed as required for new construction.
- New or relocated nonstructural elements are detailed and connected to existing or new structural elements as required for new construction.
- The alterations do not create a structural irregularity as defined in ASCE 7 or make an existing structural irregularity more severe.