Is it common practice to weld alternate ends of the hollowcore plank? When is this practical?
Connections are required in hollowcore slab systems for a variety of reasons. Most are for localized forces. Connections are an expense to a project and, if used improperly, may have detrimental effects by not accommodating volume changes or other movements that occur in a precast structure. Connections may develop forces as they restrain these movements. In specifying connections, the actual forces must be addressed. If no force can be shown to exist, the connection should not be used. The precast engineer often makes recommendations to the engineer-of-record regarding industry common practices. Typically, for buildings over 100-feet in length, with hollowcore set on structural steel, the precast floor system would require only one hard connection. This is accomplished by specifying a welded connection at opposite or alternating ends of the plank. The entire slab is then grouted in the normal manner. This allows the thermal movement in the floor slab to occur without damage to the emb
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