Engineering Center

We have a project where the contractor already cut the bolts flush with the top of the nuts without approval from the EOR (me). The steel baseplate has oversized holes. The contractor has proposed using a serrated hex flange nut and washer. We are concerned that these nuts will still pull thru the bolt holes. The project ha...

We are trying to analyze an existing base plate with Hilti HIT/HY200 V3 adhesive anchors and stainless steel HAS threaded rods in Profis. We can model and run with carbon steel rods (i.e. A36) in Seismic Category C, but the stainless rods don't appear as an an option, unless we switch to Static or Quasi-Static Design.

ESR-4266 only lists TE-YD or TE-CD drill bits with a Hilti vacuum. Can a TE-Y drill bit combined with air blow-out cleaning still meet the requirement of ESR-4266

I am looking for a detail for a 3-hour top of wall (gypsum board with metal framing) where wall is penetrated by open web steel joist.

I am designing a metal stud shear wall with wood sheathing and am looking fastener (PAF?) or anchor bolt that can be used to attach the wall bottom track to the concrete/metal deck/ bar joists floor and concrete basement wall that supports the metal stud wall. What fastener or anchor bolt would be appropriate to transfer the ...

We have a 3 hour masonry wall and have 6 sets of refrigeration lines that need to penetrate Thru. We want to core the block thru the center of the block cell and use CP-653 speed sleeves for the penetration for the fire stop

can I order a hard copy of the above Tech Guide?

In Profis, how does the program calculate edge breakout for shear when no. 4 bar or no. 4 bar with stirrups are selected? How does the program calculate concrete edge breakout for shear when reinforcement shear condition A or B are selected? What are the ACI 318 code references for this? Is there a sketch that conveys what reb...

I have an existing open web joist framed floor system with a 3 1/2 thick concrete floor slab over metal lath and need a 2 hour floor system rating. We initially specified a gypsum ceiling but there's too much material and equipment in the area. Looking for an applied intumescent solution. The joists are 12” deep with the top a...

I am in need of a UL for a (3) conduit penetration through a 2hr gypsum wall. (2) conduits are 4 in., (1) is 2 in. Similar to W-L-8079 except allows for 4 in EMT.