Hello everyone,
I've cross-posted this from the IBC (Building Officials) forum.
I've been pushed (once again) by our local concrete contractor to allow a basement wall to be built according to IBC minimums (Tables 1805.1(1) through 1805.5 (5).
1805.5 states that the tables may be used when the...
Hello everyone,
I've been pushed (once again) by our local concrete contractor to allow a basement wall to be built according to IBC minimums (Tables 1805.1(1) through 1805.5 (5).
1805.5 states that the tables may be used when the top and bottom of the wall is laterally supported.
With a...
I've got to add some cold-formed steel joists to my model. The standard material properties spreadsheet only includes A570 and A607 steel. These are outdated specs as far as I know. Are others just creating their own material on the spreadsheet? Those specs were apparently superceded by A1003...
Is there a 'best practices' approach to designing columns using Risa Floor and 3-D? I work on relatively straightforward low-rise buildings for the most part, but the axial loads can get up to 200 kips for columns at the lowest levels. Risa floor provides column sizes based on axial loading...
I've been having an ongoing disagreement with a fellow engineer. Allowable stress load combinations in the IBC (require Dead + Live + Snow be considered. My associate says that combination does not occur, so does not design for it. I say he is violating Code.
Do you typically combine snow and...
I'm working on a 4 story bldg with exterior gage steel studs. Brick veneer runs from the foundation all the way up. Per ACI 530-02, 6.2.2.3.1.3, the height limitation for the veneer above the foundation is 30 feet, with veneer supported by relief angles at each floor above 30 feet.
Here's the...
Hello. I tried posting this question on the
"other topics" forum, but got no response. I just spotted this structural steel forum so I thought I'd give it another try.
I'm designing a four story steel framed building. Code is the IBC 2003. There will be a couple of concrete stair towers and...
I'm designing a four story steel framed building. There will be a couple of concrete stair towers and a concrete elevator tower near the center of the building. I't basically rectangular, about 135 feet x 90 feet.
The floors are concrete, so I've modelled them as rigid diaphragms. I've...
Hello. I'm using Risa 3D. I've modelled a large footing under a 5 story concrete stair tower that provides lateral resistance to EQ forces. I'm a bit green using RISA 3D (or other finite element software for that matter).
I've modelled the footing as Plates, 3 feet thick, and generated spring...
Referring to IRC (2000 or 2003) Section R802.3.1;
The third sentence of the second paragraph states "Where ceiling joists or rafter ties are not provided at the top plate, the ridge formed by these rafters shall also be supported by a girder designed in accordance with accepted engineering...
Hello all. I just searched this forum but didn't find an answer to my question. I'm designing a residential foundation, cut into an hillside, and I'm treating the uphill wall as a basement wall (supported at top and bottom - not a cantilever wall).
The floor diaphragm stresses are a bit high...
