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// CODE SNIPPET

4.4 Precast Concrete Moment Frames

California Administrative Code 2019 > 6 Seismic Evaluation Procedures for Hospital Buildings > 4 Procedures for Moment-Resisting Systems > 4.4 Precast Concrete Moment Frames
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4.4.1 Precast Frames. The Lateral Loads Are Not Resisted by Precast Concrete Frame Elements

For conforming buildings, the evaluator may consider this condition as mitigated, and no calculations are necessary. The deficiency is in the strength of the connections. Check the adequacy of the precast frames. Where lateral movement will cause strength capacities to be first exceeded at connections, use R = Cd = 1.5 unless there is information on connection behavior that justifies higher values. Where all yielding occurs within members, use the R-value for the appropriate cast- in-place frame.

4.4.2 Precast Connections

For buildings with concrete shear walls, the connection between precast frame elements such as chords, ties and collectors in the lateral-force-resisting system can develop the capacity of the connected members.

For conforming buildings, the evaluator may consider this condition as mitigated, and no calculations are necessary. The deficiency is in the strength of the connections. Analyze the connections. Determine where connection failures would be brittle (e.g., pull-out of an embedded item would occur before yield of a mild steel element). Analyze structure for stability assuming that these brittle connections have failed or are not capable of transmitting forces, or check such connections for seismic force amplified by factor Cd/2, but not less than 1.5. For shear capacity, refer to Section 4.3. For flexure, find the path of forces from the element through the connection into the other element.

Related Code Sections


4.4 Seismic Evaluation Procedures for Hospital Buildings, Precast Concrete Moment Frames
For buildings with concrete shear walls, the connection between precast frame elements such as chords, ties and collectors in the lateral ...
California Administrative Code 2019 > 6 Seismic Evaluation Procedures for Hospital Buildings > 4 Procedures for Moment-Resisting Systems > 4.4 Precast Concrete Moment Frames
4.4 Seismic Evaluation Procedures for Hospital Buildings, Precast Concrete Moment Frames
For buildings with concrete shear walls, the connection between precast frame elements such as chords, ties and collectors in the lateral ...
California Administrative Code 2016 > 6 Seismic Evaluation Procedures for Hospital Buildings > 4 Procedures for Moment-Resisting Systems > 4.4 Precast Concrete Moment Frames
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8 5.5 Special moment frames of reinforced concrete 4 3.5 Intermediate moment frames of reinforced concrete 4.5 4 Ordinary moment frames ...
California Administrative Code 2016 > 6 Seismic Evaluation Procedures for Hospital Buildings > 2 Procedures for Structural Evaluation of Buildings > 2.4 Analysis of the Building > 2.4.3 Seismic Analysis of the Building > 2.4.3.1 Base Shear
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Special moment frames of reinforced concrete ...
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