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@LittleInch @lexpatrie @Eng16080 @XR250 @bookowski The rest of the story: The floor looks like a Dox Plank but I cannot locate any rebar. How it was install??? There is wire mesh in the concrete topping. A different contactor than the shower pan installer, who has worked with this customer...

@LittleInch I think we are on the same track. More of a deflection limiting/preventing device. This means of communication does have its limitations vs a phone let alone in person conversation. I will let the group know how it turns out. Thanks.

@LittleInch If the construction is a Dox Plank or variant, propping ("scaffold boards", if I understand this correctly) between the intended end supports, will/may cause a negative moment on the plank. The literature warns against this. IF the floor is what we think this is, IF it was done...

@XR250 Recommending another method for tub removal, I think is a given, even if the floor is sounds and done to best practices for this type of contraction.

@Eng16080

Now that I know how to reply to replies...thanks @lexpatrie The Dox Plank puts me on the correct track. Never heard of this type of construction. I am not sure what version of that concept was installed. Not knowing what I was looking at, I did not know what to look for. The owner did mention he...

@LittleInch Like this?

How do I address/reply to specific replies to my original post. I have clicked on many links to see if that was how, and also sent a message to the "contact us" link. Until then thanks to all. The info about Dox Plank a huge help. Joe

Another photo different basement room.https://files.engineering.com/getfile.aspx?folder=7d1a2152-c119-4fb6-a061-1423d383d666&file=IMG_8077.JPG

Here is a photo showing the ceiling. I have others.https://files.engineering.com/getfile.aspx?folder=01214dac-fb29-4e6b-9e4c-0203a63e8e3b&file=IMG_8078.JPG

EDIT - I want to reply to the individuals that replied to my original post. How is that done?? I am not sure how to research this floor construction. Single Family Home with basement, built about 1954, by local college professor. No plans, no one knows construction of floor. The walls are...

I have been asked to assess an existing piece of lifting equipment. I have analyzed many welds but this is a configuration I cannot find a method for. The load is eccentric. Plenty of examples for that as well as computer applications, but not with this weld to load orientation. It appears to me...

@BAretired I just looked at the first example where I got the correct answer. The coefficient columns were in reverse order from each other.

You made my night. The eyes are not were they once were. Obvious error on my part. Now onto bolts and brackets I am familiar with. Thanks again. Joe

I am designing the attachment for PV modules to a roof. I found a very helpful paper that explains how to use ASCE-7 for this purpose, though ASCE-7 is silent on the subject. The example is a near perfect match for my project except I am dealing with a higher wind velocity. I follow the...

In simple brackets as shown in the paper (you are correct as to which paper) I can do the weld calcs without the FEA. I have a 1.25" thick wall steel tube, 65" in diameter, 95" long, two vertical loads evenly spaced from the center. Each concentrated load 396 Tons. At the ends of the tube...

I came across a paper (Weaver Engineering Seattle WA, 1997)that indicates how to use FEA derived Von Mises to size welds. The examples are simple like a Tee bracket, but the method loses me. The part I am working with is much more complicated in shape and loading. So if I can get to the point of...