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I have a question regarding cantilevered steel columns as the seismic force resisting system. I have a steel framed platform on the interior of a building. I am using cantilevered column system G.3 from Table 12.2-1 in ASCE-05 with R=1.25 for the platform. Also, section 12.2.5.2 limits the...
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Subgrade and subbase are the foundation of a concrete slab and play critical role in its performance. According to the ACI Code, the subgrade is a compacted and improved natural soil or brought infill whereas subbase is a layer of gravel …
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Subgrade - The roadbed materials beneath the pavement structure. May be constructed from existing project materials or from imported borrow. Finished Subgrade Elevation - The top …
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These things depend a bit on the case, if the structure is small better do the two examples and decide. Except by forcing tension-only etc it is difficult the braces not to alter the vertical allocation of loads to columns, and you may prefer some columns be better more loaded or the braces, or you can operate on such things to get a more uniform and buildable structure.
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one thought: i'd be careful if you saw 95% compaction (standard/modified?). the state DOT here has a line in there about this but it's referring to remedial work...a lot of civils see that and run with it on drawings. when you read further, it requires either 98% or modified depending on the aggregate used. most everywhere here, it's modified for base course …
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Granite is a harder rock, so I was thinking no issue, but I'm wondering if permeability (bathtub effect) is a big difference when comparing granite fines vs limestone fines. I'm a civil/structural engr, and we have a good geotech that I've left a message with, but he's out-of-pocket for a day or two.
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face and subbase(s) placed upon a prepared subgrade (a "base" is part of an asphalt pavement struc ture, while a subbase is an optional element of a concrete pavement structure).
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Acting as the primary load-bearer, the sub-base is critical to spreading the load equally over the subgrade. The quality of the sub-base is critical to the useful life of the pavement. In many cases, high-quality sub-base …
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This Tech Brief presents an overview of best practices for the design and construction of bases and subbases for concrete pavements and its effects on performance. The need and use of …
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When should a wall be considered "restrained" or "unrestrained" in relation to later soil pressures. Specifically my question is in relation to 6 feet high walls of a swimming pool. The structral engineer thinks there is enough distance between the …
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The difference from a normal stop globe valve is the ability of the globe to freely move open and close as a check valve if not locked by the spindle in closed position. The attachment and griping between stem and globe will have to differ from a normal stop valve, in addition to (usually) additional spring and guiding arrangment for the globe.
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I have been asked to determine which set of standards would be the best to utilitize for properly identifying equipment, instrumentation and valves on a process flow diagram. In North America it is common to follow ISA. However ISA is 90% of the technical committee for ISO. Also I read that...
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Clearance Difference between 12.47 kV and 13.8kV Overhead Line 1. cuky2000; Aug 31, 2024 ...
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The distinction in terminology (base versus subbase) recognizes these basic differences. This publication discusses concrete pavement subbases, and the reader is encouraged to adopt this term into their common or local terminology.
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What is the technical difference between FVNR & FVR type of motor starters?
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Hy everybody, I found on the threads that grade B7M was to be used in place of grade B7 in case of sour service, they have same chemistery and allowable stress. [thumbsup] For grades B8 and B8M chemistery is different but allowable stress are same, what about the use in sour service ? Thanks...
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A subbase is a layer of gravel or soil that comes over the subgrade. Over the subbase comes the base course layer. Subbase is considered the main load bearing layer of a pavement.
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Weak subgrade and subbase layers can settle differently across the surface and cause cracks in the concrete. Any concrete project needs at least a compacted soil subgrade layer. A thick gravel subbase and base may also …
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Most native soils are not too uniform and thus require some improvement or additional layers to compensate. A subbase is a thin layer of material placed on top of the prepared subgrade. Subbases provide uniform support to the …
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The selection of base and subbase type for a given a project should be based on (1) the function of base/subbase layer with the pavement structure, (2) improve the short and long-term performance, (3) cost-effective …
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