Abstract
The paper presents the problem of protection of reinforced concrete slab-column structures against the occurrence of a progressive collapse caused by punching in the support zone. The experimental studies and effects of recorded collapses indicate the necessity to use the appropriate reinforcement type, which will significantly increase the load capacity of the slab-column connection after punching. One of the ways to protect the structure is to use an integrity reinforcement as the most optimal method of strengthening. The contents explain the reasons for the application and description of issues related to this type of reinforcement. The conclusions from the use of this reinforcement based on the results of laboratory tests were presented.
Highlights
Over the last fifty years, many building failures and collapses of slab-column structures have occurred
The results have proven that if integrity reinforcement is used when considering high yield steel, the post-punching strengthening equalled 83% of the punching force, and for medium yield steel the factor amounted to 67%
The results have proven that post-punching capacity of slabs without integrity reinforcement was relatively small
Summary
Over the last fifty years, many building failures and collapses of slab-column structures have occurred. As proven by the data [21], the majority of failures covered areas much larger than the surrounding of one slab-column connection, leading to partial or total building collapse [2] [3] [4] [5]. For this reason, the possibility of such situations should be prevented.
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