Jayrod12, LitleInch, rb1957,
Thanks for your comments,
Fatigue failure involves a large number of cycles of fluctuating load, and can happen even at stresses below the yield point. The failure in this case is different, it may have been caused by a few bounces at the natural frequency of the...
Thanks IRstuff,
May be I should have explained that I was not referring to alignment of the physical shafts. I was referring to the representation of the force vectors projected on a vertical plane. In that case, the alignment I was referring to is the alignment of the vectors in that...
To: dhengr,
Thanks for your comments. We are examining the failure of this bridge based on pictures, some of them with very poor resolution. Never the less I find the exercise very interesting. In my other post, that you mention, I believe I reached some conclusions that appear to be valid...
To Hokie66,
Here is the missing photo of the NORTH ANCHORAGE. This file together with the BRIDGE ANCHOR STRESSES.PDF will help you to make sense out of my previous message. I still will appreciate your comments on my message if you continue interested...
hokie66,
My reply to you in this thread is missing two files: NORTH ANCHORAGE.JPG & BRIDGE ANCHORS STRESSES.PDF. Apparently you can only attach one file to your reply.
Here is one of them, I will send the other in a separate reply, in case you continue interested...
Thanks hokie66 and Lomarandil,
I have been looking at the manuals of "Bridges to Prosperity" (B2P) and similar publications that a Google search returns for this topic. So far, the B2P bridges I found are of a different configuration, they make a distinction between "suspension bridges"...
The attachment, labeled SOUTH ANCHORAGE, shows a pedestrian suspension bridge built in a resort area in Central America. The span is about 90 meters. The main cable (on either) side is composed of three cables of about 1 inch in diameter. The bridge collapsed recently due to overload that broke...
To hokie 66,
Thanks for your response and your interest on the subject. It is interesting to learn how structural failures happen. However, I would say that rather than performing an investigation, I have been trying to gain some insight on the failure and, in connection with that, how to...
The attachment shows a pedestrian suspension bridge built in a resort area in Central America. The span is about 90 meters. The main cable (on either) side is composed of three cables of about 1 inch in diameter. Would the participants in this forum provide technical references with guide...
To GeoPaveTraffic (Mike?),
Thanks for your response. Would follow your recommendation. However, the practical approach may be to accept the proposed deep timber lagging, (altough it seems it is an over conservative solution, since it implies that the soil has no arching capacity).
Thanks again.
To moe333 and Ron,
Thanks for your response. I am trying to evaluate a proposal that requires timber lagging below the bench for the tieback of a soldier pile structure, all the way down to the slip surface of a failed slope. The argument in support for deep timber lagging is that the soil...
Could anyone provide technical references with guidelines to evaluate effectiveness of a line of drilled shafts to stabilize slopes in clayey soils? In particular: Is there a way to establish the maximum, effective, pile spacing as a function of the soil parameters of wet clayey soils, such as...
To hokie66 and msquared48,
Thanks for your response. No explanation given. However, it is obvious that they will have to excavate down to the slip surface (about 15 ft) to install the lagging. And that is what prompts my question. It looks to me the designer is guided by some sort of...
Drilled soldier piles with tiebacks have been proposed to stabilize a slope. The piles are WF sections, in drilled holes, 30" in diameter, backfilled with regular concrete and spaced 6 ft on centers. Installing the tiebacks requires excavating a bench in front of the piles. The excavated...
