For multi-story shoring, how many good supports are required for reinforced concrete?

In the context of multi-story shoring for reinforced concrete structures, the requirement for a certain number of good supports is based on ensuring the stability and safety of the load being supported. Reinforced concrete structures can be particularly heavy, and when a portion of the building has collapsed or is compromised, it becomes imperative to use a sufficient number of good supports to safely redistribute the load and prevent further collapse.

The correct answer indicates that for every one bad support that is compromised or unsafe, three good supports are needed. This ratio ensures that the load is adequately shared among the stable supports, thereby enhancing overall safety during rescue operations or recovery efforts. This principle is essential as it helps to maintain structural integrity while allowing for safe access for rescue personnel.

In practical application, this ratio ensures a margin of safety by providing enough redundancy to account for potential failure scenarios. With three good supports, even if one encounters unforeseen issues, there remains a solid backup from the other supports, making this configuration a critical standard in structural collapse rescue scenarios.