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There are a number of old posts on this forum from people searching for Robertson Deck info from the 1900s. In 2015, Robertson was acquired by Cordeck, and as of right now, you can obtain the exhaustive legacy deck library here...

I'm transfer some shear loads into existing brick. All of the ESR rated brick anchors I can find (mostly Simpson epoxy anchors) require 16" edge distance between the anchor and the nearest face of brick. Do you know of any rated brick anchors with smaller edge distances...

I have a client who wants to put a hole through the web of my c-channel beam. I am aware of AISC Design Guide 2, but it restricts its guidance to I shaped sections. Anybody know where I can go to for design guidance on c-channels with web openings? ========================= David Reber...

My members are greyed out and I can't edit member properties - I had recently opened the model in "demo" mode - is this a bug? ========================= David Reber www.kadent-structures.com

I had a 1916 single story 3 wythe brick wall structure tested for in-plane shear capacity at 12 locations and got the following results back. Test 1 2 3 4 5 6 7 8 9 10 11 12 avg Val [psi] 67 85 76 67 84 77 25 18 77 112 14 72 65 With an average of 65 psi, I used 30 for my analysis...

So in ASCE 7-16, there is a new requirement in § 13.5.10 “If sliding or ductile connections are not provided to accommodate seismic relative displacements [for stairs], the stiffness and strength of the stair or ramp structure shall be included in the building structural model of Section 12.7.3...

For your amusement, I have a 1 story commercial un-reinforced masonry (brick) structure in Vallejo, CA (SDS = 1.02g) getting a voluntary seismic retrofit. I've contracted to take the job, and hadn't taken a close enough look at what the design-build contractor (client) proposed for bracing...

Adding a Door to a Shipping Container There was recently a request for more technical content on here, so here's one... I have an unusual request - to add a door to the side of a 40ft shipping container "40HC". Technical drawings for a 40HC Shipping Container...

Hi all, I've got a tough one for you. In CA, A reputable manufacturer, Mason Industries, has produced anchorage demand load calculations for a rooftop unit which uses their spring isolators. The city building department has asked that I reproduce the Mason Industries demand load calculations...

So I've got a bit of a tricky situation. I've got a client with an industrial factory that was built in 1909 in a tidal zone on piles. The structure is essentially a dock, with wooden piles of unknown depth or quality into the soils below, the soils are also of unknown properties, so the...

I would like a clip that I can use to transfer shear out of the roof diaphragm into the blocking without having to remove and replace the shingles above. The ply is 1/2" thick and the loads are really low. Is there anything rated for this application...

So I'll be taking the lateral portion of the S.E. exam for the third time this spring and I'm running out of study materials, particularly for the afternoon lateral questions. Resources that I'm aware of include: NCEES "Structural Engineering Practice Exam" PPI "16-Hour Structural Engineering...

Using perforated plate cladding seems to be becoming more and more common. When you are dealing with perforated plates under wind loads? How do you perform your analysis? I'm less concerned with developing the loads and more concerned with assessing load capacity and expected service level...

Hi everyone. I don't know if this has been discussed here before. If so, my apologies. However, I wanted to point out some changes to the requirements of building models with ASCE7-16. Namely, if the stairs in your building don't have some sort of ductile elemet/slotted connection/ or...

Hi folks, I couldn't find any guidance in the AISC 360, nor on my attempts at google searching, so I've invented a method and I thought I would run it by you folks for your input: The Situation I have a post welded to a base plate, the base plate is anchored to the concrete below via anchor...

I'm really surprised to not find this topic in the eng-tips archive, but perhaps my google foo is lacking. This is a super basic question that I'm sure comes up all the time, but I would like to know what your general approach is. I have an existing two story wood framed structure with an...

Hi All, How is it you edit large sets of text in draftsight such as general notes? I am always having a terrible time with the text slowing down or with the list numbering not behaving as I expect it to. Have you got any tips?

Hello Eng-Tips, I'm trying to design a flagpole foundation for deflection without doing soils testing. The concrete foundation is 1ft diameter, 3 to 6 ft deep, so I feel safe assuming it is rigid (i.e. Shallow Foundation). The code says you can double the allowable lateral pressure if a...

I have a 12x1/4" plate beam cantilevered a short distance from a support beam and subjected to a point load which causes bending about it's strong axis. So I go to AISC 360-10 Section F11 and notice that all of the equations use Lb where Lb is the "length between points that are either braced...

If I'm anchoring an HVAC unit to a concrete roof, do I need to apply overstrength? AISC 7-10 13.3.1 reads "The overstrength factor, Ωo, does not apply". However, in ASCE 7-10 Supplement No. 1, Table 13.5-1 includes Ωo and specifies "Overstrength as required for anchorage to concrete, See...