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I am curious as what fellow engineers here consider, to arrive at net C & C uplift pressure, as dead load resisting the gross C &C uplift pressure on roofs? Regards, Lutfi

It is settled. A surcharge of 100 psf is what my engineering judgement is telling me. This is based on the project and what I know what will happen. Thanks for those who chimed in. Regards, Lutfi Regards, Lutfi

TLHS, the site cannot be accessed by traffic due to existing trees, playground and fencing on two sides. The other tow sides are water/river. Lawn mower is the most that I can envision. I will use 100 psf. I was looking for a solid reference with surcharge values other than computing based on...

All, I am analyzing a sea wall that is used for a small park. The wall is retaining 4 to 6 feet of earth with the water in the river side is about 3 feet above the mudline. The wall does not appear to be subject to vehicular traffic. I am of the opinion that 40 psf surcharge would suffice. This...

Back in the day when I designed overhead cranes and runways, the channel was assumed to take the full lateral load. I wonder why the owner want the UC to be 0.85? Your approach seems to be viable. However, keep in mind that the DL from stiffening the runway add more more stress. bones206, I am...

I am late to this post but better late than never. That 1/2" plate, is it a canopy? Also, as a side note that has nothing to do with the RISA model, did you ever try to bend a 1/2" plate to create the lip at the end? I suggest that you consider changing the plate thickness unless driven by...

Here are some of my comments: 1. The embed plate thickness is overkill for 600 lbs. 2. The number of headed studs at the end of the small cantilevered beam is not good. 3. RC beam reinforcement (top for tension and bottom to simply hold the beam ties in place) should have terminated with ACI...

Very specialized field. My advice is to hire an expert in this field. I have done a few of these designs in the past. The 0.5 psi seems low but it depends on the TNT equivalent weight and its locations form the structure. Dr. Sam Kiger with University of Missouri used to teach a week long class...

It is a terrible idea to place a footing over any water or sewer lines especially if they are pressured. If the line ever breaks and the footing is undermined, the structure will be in deep troubles. My advice, based on over 40 years of experience, is to re-route the water line if you can...

The partial collapse is a sad event. I have seen some partial floor plans of the Davenport apartment. I would love to see a complete set or at least the full sheet(s) of these legacy plans. Has anyone been able to locate them online? The following link is for various documents including the...

I believe that it is a good idea to waterproof. However, and having said that, I own a house that was built in 1915. The entire two story residence is built and supported on brick foundation. Short of minor soil erosion in the basement, the brick is outstanding. I recently built a retaining wall...

JAE, you are posting catalogues from the Sweets Catalog days! Showing your age buddy. LOL Regards, Lutfi

photo of the cover of the CRSI Handbook is attached. My copy is well used. I had a client who has several buildings that were designed using the concrete joists based on this handbook. I had to thank my wife who found it, years ago, in a garage sale. She bought for few bucks! Regards, Lutfi...

I second JLNJ Regards, Lutfi

@Joe117 I have exactly what you are looking for. Attached image is for you and the rest. I have used this table successfully for many years. It is old CRSI Design Handbook that tis for 3750 psi concrete. Enjoy it. Regards, Lutfi...

@SandwichEngine, next time when you are in the field, take a look and see how contractors stack and store supplies and equipment on roofs. Yes, it is not all over the entire roof. However, it can occupy a large area. All local members must be designed for such live loads. Also, see 2015...

@robyengIT, you get a star! It never showed upon my search at amazon or eBay. It is available form the the Canadian Amazon. It is already ordered. Thanks to all for your help. Regards, Lutfi

@BAretired, thanks. That is a helpful application that I have known about for a while. However, it is not what I am looking for. I need the book for my library. For design of round logs, using Florida Cypress, I check stresses by hand and I also use EnerCalc which allows me to add Cypress...

@DIK, thanks. I found this web site a while back. It is not what I am looking for though. I want to add the book to my library. Regards, Lutfi

Hello to all. I hope everyone one is doing well. I am searching for Hahney's formulas for Log Span Tables. I searched on line and came back empty handed. Does anyone know where I can get a copy for this nice book? Regards, Lutfi Regards, Lutfi