MDX Software - FAQ #6<BR><BR>

How are regions of composite section properties determined for stiffness analysis?<BR>
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The slab is used the entire length when determining stiffnesses for composite
analysis, with these exceptions: (1) slab over the pier for composite analysis is ignored for twenty percent of the straddling spans if either of the conditions NEG MOM SLAB NOT USED IN DEAD LOAD 2 ANALYSIS or NEG MOM SLAB NOT USED IN COMPOSITE ANALYSIS is used, or (2) specific noncomposite regions for analysis are declared with COMSPC.
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