Recent content by cooperDBM

I would need a company name and address in order to invoice them, for tax purposes if nothing else.

I'm surprised not to see a bumper system around the piers given the traffic under it. The power-line towers before the bridge look better protected.

Over-straining the reinforcing can occasionally be an issue for more typical steels when assuming the maximum allowable concrete strain. For instance a deep section with a wide compression face (e.g. single or double tee) with light reinforcing. The depth in compression to the neutral axis is...

If there was a net tension at the top cracking of the odd girder could see a sudden increase in the camber growth.

Are you accounting for any weight, including some self-weight, bearing on the top of the beam as a clamping stress?

I had thought the main difference in efficacy between the two is that N95 use head straps while KN95 uses ear loops. Bushy faces aside and with proper sizing, head straps are better even if the filter material is the same. Is that correct?

If you're running into a problem with a low rebar ratio then you have the option of adding more reinforcing instead of concrete, which may also reduce the size effect.

ACI318-19 just refers you to the Handbook for further discussion of alternate models. I believe AcK1 was a catch-all term for modes of shear resistance, other than friction, on the interface (Ac) such as mechanical interlock, dowel action, and maybe cohesion. K1 was an empirically derived shear...

It means that there is no need to add shear tension at sections where the flexural/axial/torsion tension force is at a peak. For instance midspan for positive flexure, or over a continuous support for negative flexure. In figure 8.2.8.3 this situation is shown as the flattening of curve B near...

Possible torsion failure in left span? Is the bridge curved?

Those terms are specific to ACI's shear failure model for prestressed beams, using the more detailed method. HTURKAK's diagram illustrates where each may be critical, though you generally check both at each section. Koot, both of your figures look like a web shear failure to me. Cracking above...

http://www.cplusplus.com/ https://www.w3schools.com/cpp/default.asp

Would cable-stayed be an option for you?

Bridges usually use a variable depth haunch between the girder and the deck. It allows for the camber and the difference between the girder profile and the final deck/roadway profile. The camber and profile difference often counteract each other to some extent.

Have you accounted for the camber reduction from the weight of the topping itself? If not, it could account for a large chunk of what you are trying to remove.