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Thanks everyone. In a conference with the client I discovered the foundations are soil-based (not anchored to bedrock) and we are in a marine environment, which tells me the foundations will eventually creep (rotate) out of position. A permanent negative moment from the pipe bridge will...

Thanks racookpe1978; the intent is pipes will be supported on a bridge structure. The "Towers" will be braced frame structures no higher than the bridge. Pipes will have guided supports that allow their thermal movement to take place independently of the bridge. My dilemma is only about whether...

I agree. Would they consider upgrading the girts to hot-rolled channels to address the securing of panels, including at least some period of time in a fire, and can you argue that the portal frames would collapse inward? Otherwise, better find another fire-rated assembly. We have used other...

Almost reasonable. Are you in a cold climate? It seems more likely moisture would have condensed there when the roof-side was cold. Same result. If moisture were trapped in the space when the roof-side was hot, wouldn't it remain in vapour-form, at least until cooler evening hours?

Thanks JAE, pun appreciated. Also the observation; my client would have to devise a sliding guide with hold-down capability for the negative reaction. Forces are such that a Teflon-SS type bearing is warranted, but they'll have to invert half of them. Definitely something I will point out.

A client (large Eng. company) asked me to review a single-span pipe bridge design, span >100ft. In the initial review (3 weeks ago) we introduced the subject of bridge camber, and had extensive discussions about weight, erection, galvanizing etc. In the second round it became clear the design...

A Canadian client is bidding to supply a process vessel 20m tall, with platforms and accessory equipment. Foundations will be designed by others, and the process and mechanical needs are not our concern. 1. Can a design satisfying ASCE-7/IBC or NBC be imported and used, or is there a Polish or...

Thank you all for very helpful observations and comments! Concerns about gluing, the thin web, etc are well-founded. Use of steel was considered (we can get anything fabricated, but first would try a standard CFC or Z-Girt). Our code allows "existing construction" to remain, with load...

An attic has been built with finished rooms on a ceiling of 2x4s spanning 17ft. As expected, the ceiling sagged. The owner is into a fully gutted renovation of the storey below the attic (not modifying the attic itself). The attic kneewalls are built tight to the roof rafters. So I'm looking at...

Thanks folks. This is really helpful feedback.

Previous two posts give good reasons to retain. Here's another one. If sealed drawings are mis-used such as for another project, maybe by alteration to title block etc, the EOR that has kept files is better able to distance themself, recover damages etc. In the digital age, keeping files...

(searched around and couldn't find any threads on this; also couldn't find a more suitable forum) Does anyone here use Solidworks to model steel structures? - Small simple ones, i.e. an access platform with stair, beams, posts, guardrail? - Mid-size, i.e. a small building addition or penthouse...

Precast sounds good here, since you don't have to tie it in. You'll want to consider the topping concrete for dead load, and let it fill the end spaces so the slabs are secured in place within the steel structure. To add one thing to the remarks about the trusses, consider how the erector will...

There are other possible resons for the spalling... Rebar corrosion? You didn't mention any rust staining so let's assume that's not a factor. Concrete damaged by chemical attack, freeze-thaw exposure, or simply deficient in the first place? Did the load change at any time? Yes your bearing...

I have heard the bag of sugar story as concretemasonry said; my dad had one of the earliest ready-mix operations back in the forties and fifties. Breakdowns were more common. As of the late sixties and on, I don't remember seeing bags of sugar in any of the trucks.

King/queen post if headrrom allows, yes. From your description tho, I can't help wondering how you can have an occupied mezz with only one egress route, and the exit travel distance sounds a bit long. Really this is a Q for your architect.

We keep almost everything by client (both the paper files and the digital versions). Every new job is given a standard file tree, everybody works with it. I still have to drill away at people to not create extra (potentially different) versions of digital files by emailing them around, but...

tartanss - the variety of questions back to you should be a clear indicator that more info is needed, both on your objectives and on the limitatons of your situation. That is, of course, ignoring all the quips about kips, and fun about tonnes. BTW the designations of your proposed beams seem to...

scrammblur (your handle reminds of an AMC vehicle from the late 60's-early 70's) - coupla further thoughts. I trolled around some masonry sites and didn't find anything on the use of conc block that will remain underwater. However I don't like it. Masonry is generally not used this way; we...

Welcome to engtips! Great question. Better give us 2-3 days for someone to come along with answers for you. Conc blocks are usualy kept dry, though. Are you in an area where freezing will be a factor? I.e., If you let the water table remain so high, will frost penetrate to the water? This...