Structural Systems: Steel and Reinforced Concrete (RC)

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Discussion Overview

The discussion centers on the feasibility and methodology of connecting steel structural systems to reinforced concrete structural systems, specifically excluding composite systems. Participants explore practical considerations and technical details relevant to such connections.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the possibility of connecting steel and reinforced concrete systems and seeks clarification on how such connections function.
  • Another participant asserts that it is common practice to connect steel columns to concrete, referencing standard engineering handbooks for guidance on column bases and connection details.
  • It is noted that threaded rods extending from the concrete can be tied to rebar, with steel components typically welded or bolted to a baseplate that is grouted and secured to the concrete.
  • Additional considerations are raised regarding the differences in rigidity between steel and concrete structures, the implications of thermal expansion and contraction, and the need to address potential rusting of steel components.
  • Areas of Agreement / Disagreement

    Participants generally agree that connections between steel and reinforced concrete systems are feasible and commonly practiced, but there are differing views on the specific considerations and challenges that must be addressed in such connections.

    Contextual Notes

    Participants highlight the importance of careful calculations for moment and tension loads, as well as the need to consider structural rigidity and thermal effects, which may not be fully resolved in the discussion.

    Who May Find This Useful

    Engineers, architects, and students involved in structural design or construction may find this discussion relevant, particularly those interested in the integration of different structural materials.

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TL;DR
How can a steel structural system be connected to a reinforced concrete structural system?
I've been looking over precedents for a design project and I noticed that the most commonly used systems are either steel or reinforced concrete structural systems. Is it possible for a steel structural system to be connected to a reinforced concrete structural system? If so, how does it work?
This question excludes the use of composite (steel/concrete) systems.
 
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This is commonly done with steel columns on concrete. Look in any handbook of steel structures or the AISC Steel Construction Manual for column bases or column base plates. Also, and at least as important, look in a book about reinforced concrete, such as Reinforced Concrete Design, by Limbrunner.

The general principle is threaded rods extending out of the concrete that are tied to the rebar in the concrete. The steel is welded/bolted to a baseplate that is grouted and bolted to the concrete. It's common practice, but you do need to do the calculations very carefully. Moment and tension loads especially need careful analysis.
 
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Additional considerations:
1) Difference of rigidity of both structures (steel structure tends to move and swing under live loads and, if undesired, it requires attention to bracing).
2) Difference of thermal expansion and contraction.
3) Steel will rust. As much as possible avoid solutions that accumulate rain and provide clearances for painting and for inspection of all steel surfaces.
 

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