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Impact factor
AASHTO's Manual for Condition Evaluation of Bridges allows for a reduction of impact "when conditions of alignment, engorced speed posting, and similar situations require a vehicle to substantially reduce speed" (6.7.4). But you should keep in mind that this manual is for inspection and rating...- mdstveng
- Post #7
- Forum: Bridge engineering
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MN Bridge Collpase Part III
I think it is also worth noting that the Dunn Memorial bridge, as noted by bridgebuster, had a partial collapse due to a combination of issues. The poor condition of the rocker bearings in conjunction with the flexibility of the pier, which deflected in the longitudinal direction(i.e. along...- mdstveng
- Post #14
- Forum: Structural engineering general discussion
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Precast vs. Timber lagging
PEinc, Thank you for your help. I did not design the details I sent you, fortunately. Unfortunately, these are typical walls that Maryland's DOT is used to seeing. I would like to provide a better design for them. I downloaded GEC Circular No. 4. Circular No. 2 is not available on the...- mdstveng
- Post #12
- Forum: Earth retention engineering
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Precast vs. Timber lagging
I will send them to you. Maryland's DOT is quite parochial and often will turn suggestions into requirements. They also have not published soldier pile wall standards. Do the FHWA circulars have sample design details or just descriptions that can be interpreted.- mdstveng
- Post #7
- Forum: Earth retention engineering
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Precast vs. Timber lagging
I follow regarding the precast vs. timber. Maryland DOT apparently likes the front flange to be encased. I have details illustrating this, if you would like. Can you tell me where I might be able to find some details illustrating the configurations you mentioned? I appreciate your input...- mdstveng
- Post #5
- Forum: Earth retention engineering
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Precast vs. Timber lagging
In my experience, precast lagging panels have been used for top-down construction, then once the excavation is completed, studs are welded to the front flanges, and a CIP wall is placed, and later finished with and inch or two of aesthetic concrete. Do you consider a timber lagging system with...- mdstveng
- Post #3
- Forum: Earth retention engineering
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Precast vs. Timber lagging
New Here. In my relatively short experience, I have seen mostly precast panels with CIP facing and studs welded to the front flange used in my state, Maryland. In reading through some threads, I noted that PEinc stated precast panels aren't the way to go unless certain conditions are present (7...- mdstveng
- Thread
- Replies: 19
- Forum: Earth retention engineering
