A bridge has a span of 556.7 feet and, like many modern structures, it is made of concrete reinforced with steel rebar. This combination is popular because it is strong, inexpensive and easy to construct, and, most importantly, because steel and concrete have very similar coefficients of linear expansion, about 1.1×10−5 ( ◦C)−1 . The llocations highest recorded temperature is 38.3◦C. Its lowest recorded temperature is -23.3◦C 1 (a) How much will the length of the bridge change between the highest and lowest temperatures? (b) The bridge is not a single piece of concrete, but rather is made of many slabs supported by a steel structure. Why do you think that is? (c) If steel had a very different coefficient of thermal expansion compared to concrete, what do you think would happen to steel-reinforced concrete over the course of a year?
A bridge has a span of 556.7 feet and, like many modern structures, it is made of concrete reinforced with steel rebar. This combination is popular because it is strong, inexpensive and easy to construct, and, most importantly, because steel and concrete have very similar coefficients of linear expansion, about 1.1×10−5 ( ◦C)−1 . The llocations highest recorded temperature is 38.3◦C. Its lowest recorded temperature is -23.3◦C 1
(a) How much will the length of the bridge change between the highest and lowest temperatures?
(b) The bridge is not a single piece of concrete, but rather is made of many slabs supported by a steel structure. Why do you think that is?
(c) If steel had a very different coefficient of thermal expansion compared to concrete, what do you think would happen to steel-reinforced concrete over the course of a year?
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