Initially posted this question here: https://www.eng-tips.com/viewthread.cfm?qid=519497 Hope to attract more attention on this forum. Appreciate responses!
Yakpol.
I am designing the arch culverts supported on the spread footing. My question is: can I use larger bearing resistance when maximum stress occurs under the heel of the footing?
Tradionally, the bearing resistance is calculated using footing embedment depth (Df per AASHTO) inside the culvert (at...
Curios about your opinion about ACI/AASHTO or any other code provisions about bar spacing. E.g. would it be equal to reinforce with #8 spaced at 4" vs bundled (2-#8) spaced at 8" ?
The bond area of 2-bar bundle is the same as for 2 single bars. Would it matter? Older ACI/AASHTO provisions were...
I was surprised to find that UDF do not work in the latest MS office worksheet. UDF name appears on the list after typing "=" sign, but then it becomes unrecognized (#NAME?).
If anybody encountered it and managed to solve? Thanks!
Hi,
I am estimating passive pressure Kp using coulomb formula for soldier pile wall. The value is very sensitive to the angle of wall friction. Say, for phi = 37 and delta = 16 degrees Kp = 7.7, for delta=0, Kp=4.0.
My concern is that passive earth pressure is assumed to act over the width of 3...
Hi, I am a relatively new user of mathcad and not sure of its capabilities. I am trying to solve a system of three equations. Each equation contains arrays which are dependent on the solution/variables. I am getting an error message: "indexed assignment to a matrix element is not permitted in a...
I am trying to perform linear interpolation for vector arrays P and M. Both arrays are defined as functions of single variable 'C'. C range is provided. Using built-in interpolation function M1=linterp(P,M,P1) gives an error: P - shall be a matrix of real numbers.
Is there a way to convert the...
Hi, I am designing steel bracket attachment to existing concrete using thru bolts. The bolts will be epoxied in the holes prior to installation. My question: are there recommendations for concrete bearing capacity in such situation?
Thank you all!
Hello, I have a question for geotechnical engineers. Consider typical reinforced concrete gravity retaining wall, constructed by usual method: 1)excavate behind the heel, 2)construct the wall, 3) Backfill behind the wall.
In case of taller wall (say 15 feet +) and two distinct native soil layers...
Hi all,
By ACI moment magnification factor = Cm/(1-Pu/0.75Pc), where Pu - factored axial load, Pc - critical buckling load. In case of prestressed piles, shall Pu include prestressing force?
Thank you for your thoughts!
I work on bridge seismic retrofit. The pier in question is very short, only 10 feet from top of pilecap to the soffit of superstructure. Cross-sectional dimensions 8'x9', almost a cube. In dynamic analysis the pier was modeled as a beam element and assessed as a such show that plastic hinge has...
Hi,
Is there a way to do batch printing of pdf files from Excel? It should be possible if adobe have an automation library accessible from vba.
Thank you!
Yakpol
I am assessing existing highway steel box-girder bridge for light rail loads. The fatigue loading is not well defined in the project design criteria. It references fatigue design to AASHTO which deals with highway loads. The main dilema is: how many trains shall be on two-track bridge? According...
I am checking fillet welds in the steel plate structure. The structure has been modeled as FE. I appreciate an advice or a reference to the paper discussing how to fonvert FEA stresses into shear demands on the fillet welds. Thank you!
I have a spreadsheet with a few user-defined function used in the worksheets. To speed up execution of other routins I need to temporarily disable UDF.
Thanks for your help!
I am trying to set text of the cell comment being dependent on some other cell in the worksheet. This technique is easily achievable for text boxes (Select text box and type cell address in the formula bar) but not as straight forward for the comments. Wonder if anybody knows if it's possible...
I understand it's not a very important steel property. For stray current control requirements I need to electrically connect all rebar in the base slab and to provide continuously welded bars equivalent to 70mm^2 of cooper. Searched the web, have found electrical conductivities for all...
