Question

006 10.0 point:s Two concrete spans of a 230 m long bridge are placed end to end so that no room is allowed for expansion T 20 I y 230 m If the temperature increases by 20°C, what is the height to which the spans rise when they buckle? Assume the thermal coefficient of expansion is 1.2 x 10-5 (C)1 Answer in units of m. 007 10.0 points An automobile tire having a temperature of -4.3°C (a cold tire on a cold day) is filled to a gauge pressure of 24 lb/in2 What would be the gauge pressure in the tire when its temperature rises to 34°C? For simplicity, assume that the volume of the tire remains constant, that the air does not leak out and that the atmospheric pressure re- ains constant at 14.7 lb/in2 Answer in units of lb/in2

Answer 1

6)

Final length, L = Lo (1 + a dT)

L = 115[1 + 1.2 x 10^-5(20)]

L = 115.0276 m

Span rise = sqrt(115.0276^2 - 115^2) = 2.52 m

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