Three combination rules are available in the present code: absolute sum (implemented by the function ABSSUM), square root of the sum of squares (implemented by the function SRSS) and complete quadratic combination (implemented by the function CQC). Application of a combination rule for the estimation of the maximum structural response (displacement, velocity, acceleration, interstorey drift, base shear, base moment, etc.).Calculation of various structure-dependent quantities such as base shear and base overturning moment in shear buildings.Execution of the dynamic response spectrum analysis using the function DRSA.m. These spectra can be either design spectra according to the various norms and guidelines, or actual earthquake spectra. Five types of spectra can be used: pseudoacceleration, pseudovelocity, displacement, velocity and acceleration response spectra. Definition of the response spectra that will be used for the calculation of the structural response according to the DRSA.Definition of the degrees of freedom which convey the dynamic loading in the structure.Calculation of the (lumped) mass matrix of the structure.Calculation of the stiffness matrix of the structure for the free degrees of freedom. This procedure utilizes the following steps: Response spectrum is plotted for EL-centro earthquake with 2 damping. Matlab code for the application of the dynamic response spectrum analysis (DRSA) of MDOF structures is presented. Present code plots the response spectrum for the given seismic input.
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