In reinforced concrete detailing practice, identify the correct precautions to follow when splicing (lapping) reinforcing bars to ensure strength, ductility, and constructability.

Introduction / Context:
Splicing (lapping) reinforcing bars in reinforced concrete is a critical construction detail. Poorly located or excessive splices can weaken the section, concentrate strains, and create congestion that impairs compaction. Standard detailing precautions reduce these risks and ensure that the splice region can safely transfer forces through bond and confinement.

Given Data / Assumptions:

• Reinforcing bars require splices where bar lengths end or as per bar schedule.
• Splices must maintain force transfer without compromising flexural and shear capacity.
• Best practice rules from codes and detailing manuals apply.

Concept / Approach:

Precautions focus on minimizing stress demands at splice locations and spreading splices so that the section is not significantly weakened. Avoiding splice placement in peak moment zones, staggering splices, limiting the fraction of bars spliced at any one section, and observing moment-demand thresholds are standard measures to maintain safety and serviceability.

Step-by-Step Solution:

Verification / Alternative check:

Detailing handbooks show splice zones shifted toward regions of lower tension, often near points of contraflexure or where computed steel stress is lower, verifying the rules above.

Why Other Options Are Wrong:

• Options A–D are each correct but partial; the best answer is the comprehensive choice.

Common Pitfalls:

• Placing too many splices at a single section, causing congestion and poor compaction.
• Locating splices directly at midspan or support faces where steel stress is highest.

Final Answer:

All the above.