This standard sets forth requirements for the seismic evaluation and retrofit of concrete components of the seismicforce- resisting system of an existing building. These building standard requirements apply to existing concrete components@ retrofitted concrete components@ and new concrete components. Provisions of this standard do not apply to concrete-encased steel composite components. Chapter 2 specifies data collection procedures for obtaining material properties and performing condition assessments. Chapter 3 provides general analysis and design requirements for concrete components. Chapters 4 through 9 provide modeling procedures; component strengths; acceptance criteria and retrofit measures for cast-in-place and precast concrete moment frames; concrete frames with masonry infills; cast-in-place and precast concrete structural walls; and concrete braced frames. Chapters 10 through 12 provide modeling procedures@ strengths@ acceptance criteria@ and retrofit measures for concrete diaphragms and concrete foundation systems.