Recent content by Anaximandar

Right, this is equivalent to joist supported by sloped seats, with bottom of seat horizontal. Since the roller provides reaction perpendicular to tangent of contact surface, there will be no horiz reaction as long as joist is supported by sloped seat, like I said earlier. Also, note that your...

Big appology, Vincentpa, the above comment was addresed to nutte, pin-ruller connection does have horiz reac. The only way to avoid horiz reac. is to provide (as required by SJI) sloped seated connections, where bottom of the seat is horizontal. Sorry for the mix-up. I still stand by what I...

Vincentpa, no offense, but if you can prove that a sloped member carrying gravity loads will not produce horizontal reactions at its supports - I will tear up my license and eat it:) Do a simple test: take a plastic ruler, put one end on slippery surface (no horizontal reaction) and elevate the...

Taro, you are right (off course). When I said "nearly eliminates" (should've said "significantly reduces"), I was referring to tension that needs to be taken by reinf. bars. Remaining tension is small and can be taken by the concrete, which was the point of the entire discussion here. We seem to...

If you are looking for a CALCULATOR, as in small portable, calculation gizmo:), I would recommend HP49g+ or HP48 series. The latest one, (I use it) is HP49g+ it cost $125 and you can download manny engineering programs from www.hpcalc.org. The one you are looking for is called VigaG and offers...

Sorry, that should've been "whichever is smaller" in lintel deflection limit.

Thank you, jmiec, I did not know that, as I started practice with 99 code. WillisV, I do know some local codes have certain overrides (such as Chicago Building Code limits lintel deflections to L/600 or 0.3in, whichever is greater), but I couldn't find any in IBC 2003 (adopted code by the...

Thank you for your replies, it makes a nice discussion. I finished the design using ch22, ch15 and ch14 of ACI, which, by the way doesn't specifically address unreinforced footings. Temp. and shrinkage reinf. is also not covered for footings and foundation walls. It is interesting how we are...

Does anyone have an example of plain concrete wall footing design? I was going through ACI 318-05 and it doesn't seem that min. reinf. provision applies to footings. If my footing is 12" thick and 24" wide with 12" pier on top - shouldn't arch effect create compression and nearly eliminate...

I thought contractors get their licenses, so that they could certify the work is done per plans?

Your best bet would be checking www.aisc.org and www.nehrp.gov. Last year AISC published 2005 Seismic Design Manual. Also, AISC offers free download (for members; I believe it's $10 for non-members) of AISC 358-05 publication "Prequalified Connections for Special and Intermediate Steel Moment...

Thank you for your time, I also think the pressure formula is the one to go with. I'll check that program, too, thanks Steve.

Hello, I'm a Structural Engineer, but I have to do a storm water detention calculation for one project and I'm not sure how to calculate the actual release rate at the manhole prior to connection to the main sewer line. I'm using a 4" DIP pipe restrictor. I considered Manning's modified formula...