Detailing of Reinforcement in Concrete Structures

Detailing of Reinforcement in Concrete Structures

Introduction:

Detailing is often considered to be the preparation of working
drawings showing the size and location of the reinforcement in a concrete structure.

Detailing involves the communication of the engineer’s design to the contractors who build the structure. It involves the translation of a good structural design from the computer or calculation pad into the final structure.

Detailing of Reinforcement in Concrete Structures

Good detailing ensures that reinforcement and concrete interact efficiently to provide satisfactory behaviour throughout the complete range of loading.

In this seminar, seminar, guidelines guidelinesfor successful successful detailing detailing in structural structural elements elements and connections connections are outlined. outlined.

The detailing requirements of a reinforcement bar depend on the reasons for its inclusion in the structure.

Reasons include:

1. To carry internal tensile forces, thereby imparting strength and ductility;
2. To control flexural cracking;
3. To control direct tension cracking in restrained structures;
4. To carry compressive forces;
5. To provide restraint to bars in compression;
6. To provide confinement to concrete in compression;
7. To limit long‐term deformation;
8. To provide protection against spalling; and
9. To provide temporary support for other reinforcement during construction.

Guiding principles:

• Determine location and direction of all internal forces (i.e. establish a load path that satisfies equilibrium);
• Use adequately anchored reinforcement wherever a tensile force is required for equilibrium;
• Use only ductile reinforcement (Class N or better) when the reinforcement is required for strength;
• Never rely on the concrete’s ability to carry tension (it may not exist);
• Include adequate quantities of reinforcement for crack control;
• Ensure steel details are practical and that steel can be fixed and concrete can be satisfactorily placed and compacted around complex details with adequate cover; and
• Ensure details are economical.

Sources of tension:

• Tension caused by bending (and axial tension):

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