This parameter defines the structural behavior, defining shear or flexure behavior of the structure. How do I use this parameter to define the stiffness matrix of the structure to perform dynamic analyses? I am performing RSA manually on a stick model, coding in Matlab. This parameter has no units.(dimensionless, its a ratio). RCC model. This is referred to as ALPHA in "APPROXIMATE SEISMIC LATERAL DEFORMATION DEMANDS IN MULTISTORY BUILDINGS By Eduardo Miranda"
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$\begingroup$ Which program? what are the units? material? $\endgroup$– Solar MikeCommented Oct 2, 2017 at 7:01
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$\begingroup$ I am performing RSA manually on a stick model, coding in Matlab. This parameter has no units.(dimensionless, its a ratio). RCC model. This is referred to as ALPHA in "APPROXIMATE SEISMIC LATERAL DEFORMATION DEMANDS IN MULTISTORY BUILDINGS By Eduardo Miranda" $\endgroup$– Mohammed RahmanCommented Oct 2, 2017 at 7:16
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$\begingroup$ So, what are the factors that are used to calculate the ratio? If you have them , in the correct units, do the math and enter the value / ratio into the program. $\endgroup$– Solar MikeCommented Oct 2, 2017 at 7:31
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Since you only have the ratio, and you are programming it, you have to assume an $E \times l$ for your column or beam and then apply the ratio for the other one (using 1 will do).
However, to define your stiffness matrix you will also need a ratio for your section areas. This is why I would suggest picking 2 realistic sections and approximately find that ratio for each stiffness ratio.
