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Hello fellow Structural Engineers, I am supporting a floor with 100 psf Live Load with a 16" steel beam. However, I have been asked to have a 13" diameter hole. What design guide is available to check such a larger hole in a steel beam? I can deepen the beam to as much as 24" but I am looking...

Both products are certified by the ICC for cracked concrete seismic applications. Both have ICC information for calculating capacities using ACI 318-08, Appendix D. My question is what are the intangibles? Issues with curing, placement, etc, etc.. things that make one epoxy have less...

Does anyone have any information on a comparison of Hilti HIT RE 500 SD epoxy versus Simpson SET-XP epoxy? I know that the Hilti SD is more expensive, but something tells me that it is worth. Maybe I just have more respect for Hilti's marketing tactics versus Simpson's. Any thoughts?

I definitely googled. But I didn't get definite structural information. I am not confident that going from a straight materials strength times area to calculate the capacity is the best way to go. I am wondering if there is more to it that that: manufacturing practices, etc. Like I said...

Hello fellow Structural folk, Thank you for your assistance. I have been getting a lot of feedback that stainless steel nails are flimsy, brittle and/or weak. Does anyone have specifications for structural stainless steel nails? Or a list of capacities? Thank you very much! Mike

FOR SEISMIC: (ASCE 7-05, Chapter 12) If you have a 3-story concrete building, with it's own roof, then you have a small one-story wood structure on top, with a wood gable roof, then you can apply Section 12.2.3.1 Exception 1 & 2. You can also apply Section 12.2.3.1 Exceptions a-d. If the...

It sounds to me that the defining point of a building would be if the structure has a diaphragm at each level, with reasonable story heights 8ft-20ft (bearing in mind some relative building footprint)...if so, you could use table 15.4-1. Also, see 15.5.5 for the definition of a "Structural...

I believe Supplement 1 is Seismic design of steel. So, you would be better served to go to the current version, AISC 341-05. This is the one referenced by the new 13th addition AISC [Steel] Construction Manual, aka AISC 360-06. The AISC 360-06 is referenced from the current building code, the...

Hello fellow Structural Engineers, Thank you for your help, GIVEN: 200x90 15" concrete PT slab. The 200 ft direction is split 40-120-40 by two stairway cores. In the 90 ft direction, the stairway cores split the length 45-45. FIND: So, in the concrete rigid diaphragm, do you put collector...

Hi civilperson, Thank you for your quick reply. Well, so I imagined the PT slab would be on flat forms, but wouldn't that make the situation worse by having both a live load transfer and a dead load transfer once the forms are pulled? As for L/600, aside from a M/S < Fcr.stress ->...

Hi fellow Structural Engineers, I've had an architect propose that we have steel beams support our 34' one-way PT slab. It's got me a little concerned. We have had an old-school SE consulatant claim that this is fine with an L/600 non-composite design criteria.... and he proposes add studs...

Cm is for in-service moisture content >19% for an "extended" period of time, where the environment is much drier. What is "extended?" I don't know. It could be 2 months, 6 months, 1 yr, 5yr, etc. I have been told that larger beams are typically not kiln dried, so they would likely develop...

For the construction of the original World Trade Center buildings (WTC 1 & WTC 2 = 1400 ft +/-), there was concern about the swayying of the building, and what kind of design criteria they should have. Thus, psychological studies were conducted at the University of Washington to determine the...

Hello fellow SE's, I have a situation where an old house has old 6x beams running the length of the center of the house, under the central bearing walls above. These beams have checking on the bottom (and top?), and long splits on the bottom. Yet, there are no checks on the sides.... perhaps...

2007 CBC (2006 IBC): when will these be adopted officially in Cali? Does the 2007 CBC include the structural section of the 2006 of the IBC?