// CODE SNIPPET
A509.4.4 Period Determination
JUMP TO FULL CODE CHAPTER
The effective fundamental period, Te , in the direction under consideration, shall be determined using the force-displacement relation of the nonlinear static pushover analysis. The nonlinear relation between the base shear and target displacement of the control node shall be replaced by a bilinear relation to estimate the effective lateral stiffness, Ke , and the yield strength, Vy , of the building. The effective lateral stiffness shall be taken as the secant stiffness calculated at a base shear force equal to 60 percent of the yield strength. The effective fundamental period, Te , shall then be calculated as:
where:
where:
| Ti | = | Elastic fundamental period in the direction under consideration calculated by elastic dynamic analysis. |
| Ki | = | Elastic lateral stiffness of the building in the direction under consideration. |
| Ke | = | Effective lateral stiffness of the building in the direction under consideration. |
Related Code Sections
A509.4.4 Earthquake Hazard Reduction in Existing Concrete Buildings and Concrete With Masonry Infill Buildings, Period Determination
The effective fundamental period, T e , in the direction under consideration, shall be determined using the force-displacement relation ...
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 > A509.4 Displacement Coefficient Analysis Procedure > A509.4.4 Period Determination
1613.3.4 Structural Design, Design Spectral Response Acceleration Parameters
Five-percent damped design spectral response acceleration at short periods, S DS , and at 1-second period, S D1 , shall be determined from ...
Building Code 2015 of New York State > 16 Structural Design > 1613 Earthquake Loads > 1613.3 Seismic Ground Motion Values > 1613.3.4 Design Spectral Response Acceleration Parameters
1613.2.4 Structural Design, Design Spectral Response Acceleration Parameters
Five-percent damped design spectral response acceleration at short periods, S DS , and at 1-second period, S D1 , shall be determined from ...
2020 Building Code of New York State > 16 Structural Design > 1613 Earthquake Loads > 1613.2 Seismic Ground Motion Values > 1613.2.4 Design Spectral Response Acceleration Parameters
1613.5.4 Structural Design, Design Spectral Response Acceleration Parameters
Five-percent damped design spectral response acceleration at short periods, S DS , and at 1-second period, S D 1, shall be determined from ...
2010 Building Code of NY > 16 Structural Design > 1613 Earthquake Loads > 1613.5 Seismic Ground Motion Values > 1613.5.4 Design Spectral Response Acceleration Parameters
Section 1613 Structural Design, Earthquake Loads
, and at 1-second period, S M1 , adjusted for site class effects shall be determined by Equations 16-36 and 16-37, respectively: (Equation 16-36 ...