Section and plastic modulus of built up members

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mdub12
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is there a simple way to determine the section modulus of a member made of a W and WT shape welded together, one on top of another about the x-axis. the steel manual has the properties for the individual sections; would the section modulus of each be able to be added together or will i have to calculate it by hand because it's not symmetric about the x-x axis
 
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never mind, pretty sure it has to be all calculated by hand
 

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