We are analyzing the existing condition of an existing transmission tower having long (30 ft plus) L2x2x1/4" braces. We have calculated the wind and ice loads per ASCE 7 and built a Finite Element model of the tower. we applied the wind loads and the ice loads to each individual member including...
I thought I read some time ago that pier foundations in a seismic design category D had to be linked together with grade beams. That is, an individual pier system to support a structure was not allowed.
Is this familiar to anyone? Thanks in advance.
Hello. We are designing seismic restraints for a sprinkling system and are using NFPA 13, 1996 as the specified code. The seismic force is generated by the weight of the water filled pipe.
Using ASCE 7-05 (another project specified code) from section 13.3 we calculated Fph = 1.66 Wp. This is...
I am looking for information on design of a stepped chute to carry a bulk material discharged from a conveyor. How are the chute dimensions calculated knowing the material properties? I also know the chute angle.
The material is being discharged from a valve that has a discharge opening of...
I am looking for information on design of a stepped chute to carry a bulk material discharged from a conveyor. How are the chute dimensions calculated knowing the material properties? I also know the chute angle.
The material is being discharged from a valve that has a discharge opening of...
I am involved in a project where the fabricator has used a material called S-235-JR to fabricate the structural steel. I have never heard of this grade steel, but I am told it has an allowable yield stress less than 36 ksi. Can anyone point me to a spec for this material?
thanks.
I have read through the drift and deflection criteria in the IBC and ASCE 7 and can not find any real guidance as to the allowable lateral drift at the top of a conveyor support.
We have a 145 foot bent that has a lateral deflection of 3.2 inches at its top. This seems like a lot, but maybe...
I am looking for clever ways to attach a steel H-pile to the concrete pile cap...considering uplift.
I know of the steel plate welded to the top, but I have overthought that and am not comfortable with a potential cavity under the plate.
I have used a "V" shaped rebar threaded through a hole...
Can someone tell me the correct design reference code for a LEG supported welded steel tank?
I have requested quotes from vendors indicating the tanks be designed and CERTIFIED per API 650 code. API 650 does not seem completely applicable for LEG supported tanks. Is it applicable enough to...
I am working on a new tank project and have requested quotes on 14 tanks 20,000gal and smaller. The tanks will contain petroleum based materials. The tanks are all leg supported with several nozzels for filling/emptying and different environmental instruments.
I was told to request each vendor...
I am working on requesting quotes for shop fabricated steel tanks that will be used to hold various petrolium products. The tanks are 20000gal and smaller, and are LEG supported. I sent the request out and got responses, but while in the bid process I had conversations with some vendors (not...
I agree the idea of special inspections is good, but as more and more projects enter into construction I am finding trouble. In general, my time is stretched to breaking as contractors are calling for special inspections. It seems we have releaved contractors (who are on site all day) from...
Did I dream that standard specifications had a section describing the proceedure for notifying an engineer for site review. It was something like...
Contractor to provide engineer with 24hr notice prior to proceeding...something...if engineer does not arrive at notified time contractor may...
Has anyone worked through the retaining wall examples in the CRSI concrete book. I am having trouble with the stem deflection calculation. I cannot make the units correct. Any suggestions would be appreciated.
When using ASCE7 analysis for wind force on "other strucures" to solve for wind loads on a conveyor truss, is the calculated force applied to the windward and leeward members? From what I read elswhere it seems I should just apply to the windward side, but that does not make common sense. The...
Can someone give me an idea or reference for infomation on the effects of high heat on A36 steel properties. What happens to Fy and E at temperatures around 1500 deg C (2730 deg F)
THANKS
Several times in the past I have been confronted with an architects idea for a facade that could be framed a million different ways but I have trouble deciding what is "standard" or conventional. Typically the framing, whether it is a canopy at the front of the building or a fancy cornice, is...
If a beam is loaded at the bottom flange only, does it still need to be laterally braced? In the case I am considering now, the bottom flange is equally loaded on each side of the web by a hanging wall. I realize there are several considerations such as flange bending, section modulus reductions...
Could someone explain their understanding of the construction requirements of a field welded moment connection for a OMF in seismic site class D between a beam flange and column flange? Specifically, how are the welds supposed to be run out/ground off at their ends to eliminate stress risers...
I have a storage tank (leg supported) within a concrete containment area. The floor of the contaiment area will serve as the "Footing" for the tank legs. I have seen calculations by others that state the soil pressure under a matt foundation is 10,000 psf at a site that has an...
