Good day!
I would like to ask regarding the philosophy of multi-pile bent design of pier bridges. We are usually designing 2 column pier bent, with foundation resting either on bored piles or footing on piles. My design philosophy is to design those piers using additional moment as unbraced...
I am currently designing this foreign project (road widening). The height of the wall is 9 meters. The road widening is practically small that a MSE Wall will be impossible since there is an existing road. That is why the contractor opted to instead use Cantilever Wall on footing on piles...
Good day everyone!
We will be rehabilitating an interchange, which includes widening and bridge and roads.
We have a problem wherein the sloping sides of the embankment of an existing elevated bridge approach will be excavated because a road will be constructed beside it (see attached file, the...
May I know how to compute the lateral stiffness of a pile, I've read on some references and also from here that it is usually 40 kips/in (about 70,000 kN/m/pile), but I think this is also dependent on the material and diameter/dimensions of the pile.
Thanks!
Very Truly Yours,
- andru18
I have a query about the crack control checking for the new AASHTO LRFD Code.
for the Service Limit State, particularly in 5.7.3.4, it states the minimum spacing for the steel reinforcement CLOSEST LAYER. Some says that it should be the stirrups because it is the closest, but contradict with...
Common Problem: MEFL or Flood Level is higher than the banks. We don't know whether the water came from the river or the water inland got caught up with the river. Area is practically flood-plain.
What are the usual measures/analysis for this kind of situation. Discharge capacity from Hydrology...
Okay we have this bridge that is curved in plan. The approaches were made to be viaduct style instead of introducing massive retaining walls and embankments.
Question: Does the seismic design of the "Main Bridge" be separated with the viaduct? The main bridge will be on Type VI AASHTO Girders...
Bridge with minimal curve and super-E.
But what will be the configuration if the plan will be:
- the abutment A will be curve to the right, then the pier will be straight (normal) then the abutment B will be curved to the left
Very Truly Yours,
- andru18
We have this problem for the scheme of the bridge, to get the optimal length and height.
I have some clarifications on the allowable/standards/usual guidelines in the design.
1. What is the maximum grade/slope for road approaching the bridge? (excluding the approach slab and additional minimum...
What happens to a footing designed with Vs Considered (on either or both Beam or Punching Shear)?
If the Vs provided from steel shear when added up to Vc satisfies the require shear?
Very Truly Yours,
- andru18
We were ask to inspect a bridge built in 1968 that will be replaced. It is a pony truss bridge, 37M bridge designed using HS20-44.
Upon inspection, we saw no or practically very few steel corrosion, no bent members, no visible rivet problems whatsoever. Bearing is still okay, abutments okay. No...
I am wondering, how are those end block of prestressed girders on skewed bridges are made and posttensioned? Is the face of the end block aligned with the angle of end diaphragm/backwall or still parallel with the axis of the girder? Any picture might also help, thanks!!
Very Truly Yours,
-...
Anyone has a reference on the 'actual' design of multi-column bent pier for forces resulting from plastic hinging? I knew how to design single and two columns, however I don't know how to design for three or more columns.
Thanks in advanced!
Very Truly Yours,
- andru18
AADT = Average Annual Daily Traffic
ADT = Average Daily Traffic
ADTT = Annual Average Daily Truck Traffic (is this correct?), practically the data needed in AASHTO
Due to lack of data available (ADTT), can I simply get the ADTT from the AADT, assuming that the variables needed are supposed to...
I am about to re-design the foundation of a single span bridge, 35m long, on PSCG Type V. The hard part is that the natural ground in one abutment was already excavated. The shaft is about 5m high, the footing will be about 8.5x5m design for the excavated abutment. This is on the deepest side of...
The title already said it all: This is a Bridge Project. Single Span. 30m. On RC Piles foundations.
The soil, about 5meters, that was not supposed to be excavated, and that depth, where the piles should be driven, was excavated. I don't know the reason yet.
Given that, they tried to onto the...
Due to limited options, My colleague was tasked to design a bridge, combination of 36m Type V or VI std AASHTO girder for span 1 and a flat slab bridge of 10m. Steel girder was not included on the options. Another option is the modified type VI, which we designed by increasing the top flanged...
