If a wheel load is placed next to the joint of a segmental bridge, should I assume the "effective width" in designing transverse bending reinforcement (in the top slab) NOT including the slab on the other side of the joint?
I am interested in nonlinear analysis in a few areas (e.g. geometric nonlinearity, say large deflection, post-buckling and plasticity). I am not going write any computer codes/programs doing these kinds of analysis but just want to have some basic concepts about those topics (e.g. how a...
Hi,
I’m going to design a 40m long steel composite bridge which is hung by a steel arch above with steel cables (similar to a bowstring arch bridge). And my question is about the estimate of equivalent elastic modulus of cables.
If you guys look at the attached pdf file, there are equations of...
I am modelling a prestressed box girder bridge in a shell element model and believe the effect of shear lag should be automatically taken into account. However, as you may have expected, the longitudinal stress in the slab is not uniform and the stress in the deck around the webs is higher than...
I am designing a half through steel truss with span of 52m (approx 170 ft) and skew angle of 15 degs. Since the skew angle is small, there are no end trimmers, the end cross beams are just rotated in plan by 15 degs.
I read some guidance, rocker bears should be placed under the acute corners to...
Hello,
I just read a book about box girder design and one of sections talks about how to work out the bending moment in a diaphragm if the bearings are not right underneath the webs.
I am used to design diaphragms as a "simple beam" or use strut tie method. The method shown in the attachment...
I have a problem about extension of an existing subway.
I did diaphragm wall before and I understand it is not difficult to make a NEW diaphragm wall watertight by placing waterstops before concreting.
However, I have no clue of how to make waterstop fitting into the slabs and walls of the...
I am doing design of a composite girder which is formed of a steel “U” trough with concrete slab at top.
Because of torsional and distortional warping stresses, do I have to design shear studs for these load effects? If so and warping stress being, say A (N/mm2) at the junction between the web...
For prestressed bridges, pre-cambering is needed to offset deflection due to creep and self weight. And, for long span bridges, the pre-camber may be, say 150mm. My question is how the pre-camber marries with ideal highway vertical alignment which may affect drainage design on the bridge deck...
I am going to do preliminary/conceptual design of a piled wall. Since the wall is to retain soil/fill supporting railway tracks, deflection at the top is a major concern.
The program available to me is Wallap which is said to be able to stimulate the effects of strut/anchor fixed to the wall...
I am going to design piles to be installed in embankment which carries railway tracks. After the piling has been done, the side slope in front of the piled wall will be excavated.
My questions are:
1) What was used to fill up the embankment (200 years ago!) is not known yet at this stage. I...
I have to design concrete facing (cast in-situ) on sheet pile wall. If the concrete is 150 mm (about 6”) thick and there are “shear studs – actually just some bars welded to sheet piles” to make two sections (concrete + steel sheet pile) as a composite section.
The tricky bit is I am asked to...
I am going to design a river training wall which comprises steel sheet pile. The difficult doesn’t lie in the design of the sheet pile but in precast cladding to the sheet piles.
Does anyone have a sketch showing how the precast concrete panels fixed to the sheet pile wall?
I am designing a concrete wall (of just 5m height) to support a staircase taking pedestrians to a footbridge.
At one end of the wall, it is connected to another concrete wall or a cross wall. From this connection, I believe a certain length of the wall (supporting the staircase) next to the...
I have to check a channel section which is sub to torsional moment.
However, I can't remember the equation for the calculation of shear stress because I have left school for a long time.....
I am wondering whether anybody remembers the equation....
Thanks!!!!
A want to do some VBA codes on a spreadsheet and the codes can run automatically.
For instance, if I input assign 1 to A1 and 3 to B1, I want to write a set of codes behind a cell, say, C1 to work out sum of A1 and B1 and display the result in that cell.
I remember there is a...
I am going to replace the bearings of a prestressed bridge (by jacking up the deck).
Does any bridge guys give me some clues how much should the deck be jacked up for 1) installing the new bearings and 2) installing the new bearings + cleaning bearing shelves?
If the bridge is simply...
Hi Bridgemen
There is a steel composite bridge comprising 4 I girders and a concrete slab. The railway tracks possession time given to the erection of this bridge is short so I would like to cast the slabs over two pairs of girders and leaving the central bay/strip open. Once the two pairs of...
