Hybrid steel structures refer to buildings or structures that use a combination of different materials, typically steel and concrete, to achieve specific design goals or optimize performance.

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The combination of steel and concrete in a hybrid structure can provide several advantages, such as increased strength and durability, improved resistance to environmental factors like earthquakes and wind loads, and enhanced fire protection.

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One example of a hybrid steel structure is a steel-concrete composite beam, where a steel beam is encased in concrete to create a more robust and stable structure. Another example is a steel-framed building with a concrete foundation, which can provide both flexibility in design and stability in construction.