(a) Draw a qualitative influence line for the moment at the top of column AB in Figure P12.55. Indicate the spans that should be loaded with a uniformly distributed live load to maximize moment in the column. (b) Sketch the influence line for axial load in column AB and indicate the spans that should be loaded to maximum the axial load. (c) Sketch the qualitative influence line for positive moment at the midspan of girder AC.


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