1617.8.3 Energy methods.
BC § 1617.8.3
Static inelastic analysis using energy equilibrium may also be used. The structure does not need to remain elastic; however, the response ratio and rotation limits obtained from Table 1617.8.3 shall not be exceeded. Table 1617.8.3Response Ratio and Rotation Limits Element Response RatioRotation Element Response RatioRotation Concrete Slabsμ < 10 Ø < 4°Post-Tensioned Beamsμ < 2 Ø < 1.5° Concrete Beamsμ < 20 Ø < 6°Concrete Columnsμ < 2 Ø < 6°Long Span Acoustical Deckμ < 2 Ø < 3°Open Web Steel Joistsμ < 2 Ø < 6°Steel Beamsμ < 20 Ø < 10°Steel Columnsμ < 5 Ø < 6° For SI: 1 degree = 0.0 1745 rad. Note: Table 1617.8.3 is intended for SDOF and simplified MDOF response calculations and a low level of protection. Table 1617.8.3 does not apply for explicit finite element methods that calculate the performance of the structural elements in response to the specified loading intensity. Steel joists: downward loading 6 degrees, upward loading ductility of 2.
