Joe_Carrick Posted October 27, 2018 Share Posted October 27, 2018 I have a project where a steel Guardrail is to be attached at one end to a concrete block pilaster and at the other end to a stud wall. There are no intermediate Newels or Posts. I haven't been able to find any standard details for such connections and the plan checker is being a PITA. Does anyone have details to meet the 200 lb load requirements for these conditions - preferably with supporting calcs ? Link to comment Share on other sites More sharing options...
javatom Posted October 27, 2018 Share Posted October 27, 2018 You might try some of the cable rail manufacturers web sites. Link to comment Share on other sites More sharing options...
ACADuser Posted October 27, 2018 Share Posted October 27, 2018 Well, shear should be no problem for 2ea 1/2" bolts ea end. I assume you have a flat plate bolted to the adjoining materials. The issue is calculating pullout. Pull the middle of a cable attached at its ends & stress gets a bit high. Still epoxy set bolts have a high pull out in filled masonry. Wood is another matter. May need a bolt & washer on that end. Looking at the FDOT 862 railings the railing is attached at the bottom into concrete which is a greater stress. I'll look tomorrow to see if I have anything you could use. Link to comment Share on other sites More sharing options...
Kbird1 Posted October 28, 2018 Share Posted October 28, 2018 The Railing Guy I spoke to recently said they make the plate twice the size of the railing , ie for 2.5" it was a 5" sq plate with 4 holes , he was using 3" Stainless 5/16 Lags and Washers...... not that that really helps you but you could likely find the Specs on the Lag Screws. OSHA has one I came across , not sure if it helps ...... osha-guardrail-details.pdf And Hilti has lots of info in there Concrete Anchors Technical Bulletins including some info On CMU Blocks. They might even be worth a Call Monday? Hilti Conc_Anchors_2.pdf Hilti_Conc_Anchors Technical.pdf *** Forgot to add the AWC has a Connector Calculator here : https://www.awc.org/codes-standards/calculators-software/connectioncalc M Link to comment Share on other sites More sharing options...
ACADuser Posted October 28, 2018 Share Posted October 28, 2018 Simpson has some software that may be of some value to you: https://www2.strongtie.com/software/anchordesigner-asd.html Also the tension on the connections can be quite high. https://www.ropelab.com.au/two-point-anchor-calculator/ Link to comment Share on other sites More sharing options...
ACADuser Posted October 28, 2018 Share Posted October 28, 2018 In our area Simpson is popular in residential, Hilti in commercial. Engineers prefer Hilti from what I see. The Simpson products are available at Home Depot. https://www.strongtie.com/anchoringsystemsforconcreteandmasonry/landing https://www.strongtie.com/strongdrive_exteriorwoodscrews/sd_screw/p/strong-drive-sd-connector-screw Link to comment Share on other sites More sharing options...
ACADuser Posted October 28, 2018 Share Posted October 28, 2018 Found this https://www.cedengineering.com/userfiles/Design of Com-Ind Guardrail Sys for Fall Protection….pdf The math is a bit over my head though. But if the top rail is stiff that would reduce the tension on the connections. I'm referring to 200# applied to the top rail outward which will flex the top rail & put tension on the connections. The tables for the connectors show the shear capacities but the tension loads will need to be calculated. One way around the tension problem is to put a slip connection in the design. Link to comment Share on other sites More sharing options...
Richard_Morrison Posted November 1, 2018 Share Posted November 1, 2018 It would be hard to come up with any details or calc's without knowing the span of the guard and design of the rails in cross-section. Not offering to do it, but just pointing out that we aren't psychic structural designers. Link to comment Share on other sites More sharing options...
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