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TRIMMER BARS REINFORCEMENT
As you can see the beam-like bars around the edges of the slab opening below, it helps mitigate cracking and also prevents cracks opening far enough that they would become a problem by stopping them from propagating further into the slab.
As you can see the beam-like bars around the edges of the slab opening below, it helps mitigate cracking and also prevents cracks opening far enough that they would become a problem by stopping them from propagating further into the slab.
It can be placed in diagonal or straight but also must be installed near the surface of the slab as that is where control of the cracks is most important. However again, it is best practice to support the trimming reinforcement using spacers and cast the concrete around it.
If concrete cover is not controlled, it renders the trimming reinforcement redundant and cracking will not be controlled. It's also good to have the additional number of bars equivalent to the rebars interrupted by the openings.
Whatever is the purpose of slab openings in your project, it should never be taken for granted as somehow, it has an impact on your slab design hence the need to use trimming/trimmer bars reinforcement.
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