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Hello Bridge Engineers, Does anybody shed me light on drainage arrangement of bridge decks supporting high speed train slab tracks/track slabs? HP

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...

Bridgebuster, British steel bridge design code doesn't cover U frmae / half through bridge with skew, how about other codes? HP

Bridgebuster, If torsional restraint is needed at the support positions, elastomeric bearings seems to be flexible... For your tursses, are they all skew bridge? HP

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...

Zambo, Thanks for your advice. I understand that precamber probile is for creep and/or shrinkage, deflection under S/W + ......other effects. The brdige deck profile will turn to "ideal or desired" profile after say 50 years when all these effects (e.g. creep) has already occured. However...

Thanks for all advice. Here is an attachment where my question came from. If you look at Fig 7.49, the max sag of the camber curve is not at midspan span because it is for balanced cantilever construction. Does anybody has any clue how it fit with highway vertical...

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...

This project is in the UK and the full storey is a little bit more complicated. (Pls see the attached sketch). What the client wants to do is to demolish the masonry brick viaduct (i.e. the arch), which support the sidings, and the adjacent masonry retaining wall. Before the demolition, some...

yakpol, Could you show me the address, I didn't manage the documeny at FHWA's website? HP

I think reading "Precast Segmental Box Grider Bridge Manual", published by Post-Tensioning Institute and "Construction and Design of Prestressed Concrete Segmental Bridge" by Walter Podolny & Jean Muller is a good starting point

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...

Could you guys please give me some clues on the calculation of tensile force induced by concrete shrinkage?