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// CODE SNIPPET

A509.4.4 Period Determination

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
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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:

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 ...
2020 Building Code of New York State > 16 Structural Design > 1613 Earthquake Loads
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