A rigid triangular frame is pivoted at C and held by two identical horizontal wires at points A and B (see figure). Each wire has axial rigidity EA = 120 k and coefficient of thermal expansion α = 12.5 × 106 / °F.
(a) If a vertical load P = 500 lb acts at point D, what are the tensile forces TA and TB in the wires at A and B, respectively?
(b) If, while the load P is acting, both wires have their temperatures raised by 180°F, what are the forces TA and TB?
(c) What further increase in temperature will cause the wire at B to become slack?

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2b