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1. (50 points) The figure below shows the idealized retaining wall structure under the horizontal earth pressure. AB is an axial member with stiffness EA.

1. (50 points) The figure below shows the idealized retaining wall structure under the horizontal earth pressure. AB is an axial member with stiffness EA. CD is a flexural member with stiffness EI. The distributed load on member CD is triangular, with a peak intensity of q0. Determine the horizontal displacement of node C using the method of virtual work, or the method of Castigliano's theorem

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