I have been asked to design a fall arrest system based on something a contractor has used in the past or maybe he just found this picture online. I have not been provided any information as far as why type of lanyards will be used etc. so I was going to design for the minimum 5000 lb load. However, this particular device was attached to the a web member of the wood roof trusses. I am concerned that during a fall event that the gang nail plates will not be sufficient to resist the lateral force at the ridge. On my specific project, the roof trusses at the peak have a single king post in the center, rather than two sloping web members. Using the bracket in the supplied picture, my king post gang nail plate would be put in shear, which I am uncertain how it would perform. I tried doing a google search for fall arrest systems thinking this was a picture of a proprietary system, if it is, I was unable to find it. Am I the only one that thinks this looks a little questionable? I am thinking it would be better to move the anchorage to the top chord, then if a fall occured, the bracket would be putting the truss top chord into compression like it is designed for already. I just finished reviewing the truss shop drawings and there were some revisions to be made so the trusses are not fabricated yet, so getting some of the trusses beefed up to support this falling load could still be done. Has anyone else designed some fall arrest anchorage like is shown in the picture?
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