My building is a single storey that i have stabilized with beam/column frame around the perimeter (no internal walls to provide lateral bracing). To size the columns, i have considered earthquake and wind forces.
To analyse my structure for earthquake, i have isolated one column and idealized it as a cantilever with a lump of mass at the top (and fixed at the bottom). I am trying to get a value of horizontal coefficient to use against the weight acting on my cantilever column in order to obtain the base force. My building's calculated fundamental period is equal to 0.198s. Based on this value of fundamental period, the code specification requires that i use equation Sd = Ag x S(2.5/q) where:
Sd = the design response spectrum for elastic analysis (non-dimensional value)
Ag = is the reference horizontal peak ground acceleration factor in type ground, expressed in earth gravity acceleration (g)
S = Soil factor
To represent my building's response behavior i have chosen the value of "q" to be equal to 1
From the values of the parameters describing the design response spectra, S = 1.2. When using this value with peak acceleration factor of 0.15 in the above-mentioned equation, my calculation gives me Sd = 0.45. Is this value normal? It is rather unusual to me (seemingly high). Is there something i am not doing right? I understand that the value of horizontal coefficient can go up to 50% of the vertical weight. However, i am still skeptical of my value.
Design Code: SANS10160_4:2017
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