Consider the two composite columns shown below and denoted as columns 1 and 2. These columns have same gross area but differ in the geometries of the steel and concrete components. In particular, the square steel hollow section in section A-A (for column 1) has thickness of t, while the square steel hollow section in section B-B (for column 2) has thickness of 2t. a t t Column 1 steel steel concrete concrete B B Column 2 2t 2t 2t 2t a a Section A-A (for column 1) a Section B-B (for column 2) Assume that these columns are subjected to the same sustained load Po applied at time to and maintained constant afterwards (see time axis below). РА Ро 0 time Provide a qualitative description of the variation over time due to creep effects (do not consider shrinkage effects in this question) of the following variables for each of the two columns considered (i.e. columns 1 and 2): 1) deformations in the concrete 2) deformations in the steel 3) stresses in the concrete 4) stresses in the steel For each of these variables (i.e. deformations in the concrete and steel, and stresses in the concrete and steel), comment as to which cross-section (i.e. cross-section A-A of column 1 or cross-section B-B of column 2) is expected to exhibit higher deformations and stresses in the concrete and steel.

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