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Concrete has good vertical strength but poor horizontal strength. Because of this lack of horizontal strength, reinforcement with rebar or other methods is necessary. Sometimes, concrete reinforcement is not included in the original design or is forgotten during the pouring of the concrete. Under such circumstances, it is advisable that reinforcement be incorporated after the fact.
In this case, many different size columns were cast in place as designed for foundation of various water slides. Vertical rebar cages were used; however, horizontal ties were missing when the concrete was poured.
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