Why do we provide steel as reinforcement in concrete structure?

  • Main reason is the properties of thermal expansion for both steel and concrete are approximately the same as both have nearly equal coefficient of expansion. So whenever thermal atmosphere affect the structure, steel and concrete both shrink or expand at nearly the same rate. This bendability property of steel makes best material as reinforcement in concrete structures.
  • Concrete is strong in compression and weak in tension while steel is strong in tension force and weak in compression.
  • As you can see in the image simply supported beam shown over there. In simply supported beam after the loading on beam upper section of cross sectioned beam tends to compress while bottom section tends to tension.
  • Concrete is weak in tension so concrete may fail suddenly at the high yield of the load. To prevent such failures we provides steel at the tension zone, after placing steel bars at the bottom tension section, the chances of sudden failure be zero and may develop flexures cracks and shear cracks.
  • This is only in case of simply supported beam, in the other types of beam the method will be the same but the compression and tension zone positions might be change.
  • As you can see in the following figure of cantilever beam the tension zone react at top section (which is above the neutral axis of cross section) and the compression zone react the bottom section (which is above the neutral axis of cross section) after the loading.
  • So we provide steel in the tension zone (top section) to prevent the failure.

Post Author: hemantduva

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