Hi all. I recently moved to the US and am trying to get better versed in seismic design using local means and methods. I live in Florida, so unfortunately the local engineers generally know very little in this area. In my research thus far, I've come across many different codes and standards...
I'm looking to design a canopy-type open structure using either arched trusses or a hip framing for the roof. Neither of these scenarios seem to be covered in ASCE 7-05. Does anybody have any suggestions or other references that may help me determine the wind load distribution? Perhaps the...
I am reviewing some old calculations/design of a 4' thick concrete footing. The design engineer placed their required (As.min) flexural reinforcement (tension/compression) on the top and bottom faces in each direction. This I understand. However, they placed an additional layer of...
I have a few questions concerning ASCE 7 Clause 2.3.2 - Exception (2). It states: "The load factor on H shall be set equal to zero in combinations (6) and (7) if the structural action due to H counteracts that due to W or E. Where lateral earth pressure provides resistance to structural...
I have a question regarding the design of a batter pile that braces a sheet pile retaining wall through compression. In reviewing a couple designs performed by other engineers, I am tending to disagree with their analysis methodology, which is similar to how a truss is analyzed. This is as...
Hi all,
I've spent bits of free time over the past year or so trying to learn what I can about FEA and practical application in structural analysis for civil structures. I haven't spent a great deal of time on in-depth theory just yet, but I plan on taking some night courses once this d*mn...
I've attached a file that details what I'm asking. The drawing isn't to scale so this is more for theoretical purposes. I hope that someone here can confirm or correct my reasoning...
As the image shows, I'm looking at two stepped retaining walls in very close proximity to one another. All...
Does anybody have any references for calculating the capacity punching shear/pull-through of a bolt in a relatively thin steel plate? I remember performing the calculation a few years ago but can't seem to remember my source.
Thanks.
I have a few questions that I'm hoping some of you may have some insight into. FYI, I'm basing my questions off of ACI 318-05.
1) Imagine that a 12" long anchor is being cast 6" into a slab. A 6" secondary pour is then cast atop the original slab once cured, thus creating a horizontal cold...
I have a question regarding the required anchor setback on general retaining walls or bulkheads. Perhaps someone here has some insight. I already know the following:
Lets assume an anchored sheet pile bulkhead. The location of a bulkhead anchor must account for two sliding planes to ensure...
I'm looking to purchase some software that will allow me to construct interaction diagrams for prestressed concrete sections. I've found that Structools offers PvsM do do just that. Before I go ahead and purchase it, I thought I'd check to see if anybody has any experience with it?
Thanks.
I'm looking to design a concrete slab boat ramp, one that is used to launch/retreive boats in a salt-water marina. Instead of pouring a typically reinforced concrete slab, I was considering using a material such as GFRP. I don't have much experience with this material, and we have no relavent...
I'm running STAAD.Pro 2006 (1002) and I am trying to perform a frame analysis based on the AISC D.A.M. I'm concerned that the P-Delta analysis function does not account for the small p-delta effects (member stability) in addition to the big P-Delta. I work with marine structures so we don't...
Hi hopefully this will be a straightforward question as this is not my field of practice:
I'm looking at a preliminary design of a sacrifical anode cathodic protection system for a sheet-pile bulkhead structure in brackish waters. The steel used will be A572 Gr.50 and will be coated with a...
I'm writing this in hopes that people will offer their experience in dealing with prestressed concrete slab/beam repairs as it relates to my situation. I'm weighing the options of replacement with temporary (~2-10 yr life) repairs while the client weighs their options.
I'm dealing with a...
I'm trying to track down a stress/strain diagram (or curve equations) for 270K stress-relieved strands. Does anybody know where this might be available?
The strands I am performing the analysis on were stressed in 1985/1986, have the material specs changed since this time?
Thanks in adavance.
I'm currently analyzing a prestressed concrete beam for the purpose of issuing repair recommendations. The as-built drawings date back about twenty-five years, and I question the logic in part of the design.
The beam in question is simply-supported with sixteen 1/2" prestressing strands on the...
I'm trying to accurately model a pier in which two 18" prestressed concrete piles (one battered) will be tied together using a simple pile cap. Since there will be significant lateral loading and need for moment transfer, I'm trying to find typical detailing for a simple moment connection. The...
I'm designing a sheet-pile seawall that will be founded in what borings indicate to be primarily hard limestone (>100 SPT blow counts). The geotechnical report give values for design of Phi=0 degrees and cohesion = 100000psf. The extremely high cohesion combined with low friction angle makes...
In analyzing "long" free-headed laterally loaded piles in sand using Brom's analysis, I'm finding that the allowable loading based on pile bending capacity decreases with an increase in the soil friction angle. I'm not a geotechnical engineer but this seems to defy general logic to me. If the...
