I'm designing a 2 story steel framed building with moment frames each direction on the east coast which could end up in either SDC C or D. The frames use HSS square 77" columns and wide flange beams for the frames. Assuming it is SDC C, would I be able to use R=3 and treat this as a non-seismic...
I would like to know the minimum depth of partial joint penetration that is pre-qualified by AWS D1.6 for the following AISI Type 316 standard pipe sections:
3" pipe
4" pipe
8" pipe
I don't have the AWS D1.6 code (nor the AWS D1.1) to use as a reference or compare. A pair of 8" pipes, 4 ft...
Hi All,
I would like to know the minimum depth of partial joint penetration that is pre-qualified by AWS D1.6 for the following AISI Type 316 standard pipe sections:
3" pipe
4" pipe
8" pipe
I don't have the AWS D1.6 code (nor the AWS D1.1) to use as a reference or compare. A pair of 8"...
A contractor proposes to install 42" diameter x 10 to 15 ft long precast piers in sand/silt soil for support of 40 ft traffic poles. The standard procedure, Dept of Transportation, is to pre-drill holes 12" larger than the foundation and place clean sand in the voids using hydraulic methods...
All,
Does anyone have experience specifying AISI Type 304 Stainless Steel for platforms and structural members supporting operating equipment and large pipelines in concrete oxidation ditches for Wastewater Treatment Plants. Type 316 was specified but questions of cost have arisen.
The...
An agency has issued Contract Document Drawings (several hundred files) for bidders in an Autocad Postscript Support (.PS) format. I am not familiar with this format and don't know how to display it.
How can I view the drawing files? Is there a driver or download software required...
I am trying to make a decision to purchase either the 1986 or the 1996 edition of the AISI Design Manual (available online at AISI store) for the design of cold formed steel (light gage framing) and need some advice from those who have used both. Any preferences and why?
I generally only...
IBC 1607.9 paraphrased:
Live loads greater than 100 psf cannot be reduced, except that live loads for members supporting two or more floors may be reduced by as much as 20 percent. Would the 20% reduction apply to column bases and foundations in a two story building, i.e., roof counts as a...
As background, a two story, 3 wythe brick exterior clad rectangular building built in the 1930's is to be gutted and replaced with a new 2 story steel structure. The brick exterior will be temporarily braced and preserved in the new building.
The Construction manager wants to use a...
Can anyone advise what the typical maximum length of reinforcing bars (# 8 and larger ) that is manufactured and transported to the construction site (no special transporting permits)?
I am designing a large foundation mat for concrete tanks.
Not sure if this is the right forum to post this. I am designing tubes/pipes, angles & I-beam shapes as equipment and pipe structural supports in waste-water concrete tanks. I am using 316L stainless steel, A269/312 and A276. My questions are:
1. Where can I find a structural design guide...
I am designing tubes/pipes, angles & I-beam shapes for use in waste-water tanks. I am using 316L stainless steel, A269/312 and A276. My questions are:
1. Where can I find a design guide, section properties, stresses for design of stainless steel, or similar information.
2. I have been told...
I am designing a pair of vertical aluminum round tubes (pipe columns) 4 ft apart, 23 ft high, and braced (laced) at quarter points using smaller aluminum tubes welded to the vertical. They support an aluminum walkway platform and a mechanical mixer for aeration of wastewater in an oxidation...
I am reviewing the construction of a 60 ft x 12 ft x 10 ft deep concrete trench or vault for pumps in a wastewater pump building. The walls and base are 14" thick, reinforced with 2 layers of reinforcing, and sized to resist flotation from a high water table.
The design does not need to...
I am a structural engineer designing concrete wastewater oxidation ditches.
Carbon steel pipe is used for aeration piping supported from the concrete structure, diameters from 4" to 30". Where can I find a handy table of physical pipe properties for these sizes?
Thanks.
My interpretation of ACI 350-06, 9.2.6 is that the environmental Durability factor, Sd, does not apply to the concrete shear capacity check, for example, in a sanitary tank wall. That is,
phi*Vc = phi*2*sqrt(f'c)*b*d
I used the above to determine the tank wall thickness which is governed by...
I am designing a 28" min. thick concrete mat foundation approx. 200'x250' (L-shaped in plan) for a 25' deep oxidation ditch. Typical basins for each zone are 40' x 40'
Mud valves/drains are provided to drain each basin and the slab slopes 1/8" or about 6"+/- from perimeter high points to...
I am designing a 10'deep x 10' x60' concrete trench housing a water supply pipe at a pump station. The trench need not meet watertightness requirement. Is the load combination of
(1.4 D + 1.4 F) per ACI 318-08 sufficient for designing the trench walls for lateral thrust from the pipe...
I am reviewing the loading capacity for an existing structural concrete slab used as an exterior balcony. The existing drawings indicate the building was designed to satisfy the 1988 Standard Building Code. Can anyone post or state the live load requirement specified in that code. The...
I am designing the concrete pad support for an Emergency Generator that weighs 50 Kips, footprint say 10ft x20 ft. I understand that the traditional design of a concrete pad without mechanical damping would require a concrete slab about 2 to 3 times the weight of the generator. If there is...
