I am working on an existing building (1960s) that the roof is composed of precast perlite panels (about 1.5 feet wide) spanning between the roof joists. The company that made this product is no longer in business.
The roof has a lot of water damage and with the recent thaw it is raining in the...
Hello everyone:
I was wondering what Retaining Wall Program people use out there. We were using RetWall for a long time. However, the disk became corrupt and our IT guys deleted it off the engineering computer.
I am just wondering what people are using. I have done the last few by hand...
Hello:
I am wondering if anyone has come across this condition before. We are looking at a building with a basement which is located in an area with a very high water table. Therefore we need to use a mat foundation which we can waterproof around it and use its weight to resist the buoyancy...
Does anyone know of a good reference for structural design of a green roof?
I have a lot of concerns since I have never done it before and would like to read about the latest research.
- Such as the roof freezing in winter which could cause lots of ponding.
Thanks,
Craig
I have a building that is five years old, that is under going some movement. The building is two stories and the bays are 22’ X 44’. The 44’ purlins span north – south. The first floor is on grade. The second floor is composite. The roof is joist and joist girders. At the perimeter there...
Hello:
I'm currently analyzing an eight story building that they want to expand one floor.
The existing structure was built in 1960 in Wisconsin. It is a two way flat slab with drop panels and column capitols. We were checking to see if it was ok for seismic loads. (We have site class C...
Has anyone had any experience in evaluating structures after fires?
Is there any reference you can point me towards. I have been asked to look at a few buildings in one unit that have had fires in them. The buildings are built of different materials concrete, steel, wood, masonry. I would...
Hi:
I have a composite floor system composed of 2" deck with 3 1/2" concrete topping for total thickness of 5 1/2". I got a request from the owner and mechanical engineer to put some copper pipping in the floor slab for heating around windows. The pipping I was told would be a...
Hello,
Does anyone know of a design aid for designging cold form shear walls? I have a grocery store that they want to use the steel studs with plywood attached to resist the loads. I have looked at IBC2000 which has some shear values. However, I would just like something more to read so I'm...
The company I work for has got a lot of work all of the sudden in which we have strict vibration criteria. (V < 2000 microinch / sec.) In order to analyze steel structures I have been using the Steel Design Guide Series 11, "Floor Vibrations." I am wondering the following:
1. In...
Has anyone heard that LRFD 3rd version reduced the capacity of studs by 25% due to an offset required because of ribs in the metal deck? Someone in our office was talking about this today and I'm wondering where I can read more about this. How does this effect our ASD beams?
Thanks,
Craig
I have always designed a metal roof deck to be a flexible diaphragm where the lateral loads are distributed by tributary areas. The IBC 2000 uses the definition for a flexible diaphragm is that the lateral deformation of the diaphragm is more than two times the average story drift of the...
