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Thank you Sym P.le. So I guess the Hennigsdorf prestessing steel,which is solid bars as opposed to wire strands, was used. It is hard for me intuitively to understand why solid bars would be used instead of wire strands that are universally used for post tensioned concrete. The strands stretch...

I don't speak German but I was watching a video on this failure. The video showed post-tension ducts with what appeared to be reinforcing bars instead of strands. See attachment. Does anyone have any knowledge of this...

If the CMU is not connected to the roof deck or spandrel beams it will only span horizontally to the wind columns and main columns.

Thanks to all for the replies.

The bridge is the Carbella bridge replacement project in Park County Montana. https://seaeng.wixsite.com/carbella

I just saw a video of a steel truss bridge erection. It was a two lane (two trusses) span of 210 feet. The trusses were 14.67 ft deep. The floor was going to be steel beams and concrete deck. There was no horizontal bracing at the top chords of the trusses. How is the top chord designed for...

Does anyone know who the structural engineers or firm that did the structural engineering for the St. Louis Gateway Arch? I think PDM in Pittsburgh was the fabricator and erector. I know Ero Saarinen was the architect. I also know that Salvucci Engineers in Pittsburgh played a part, possibly as...

Thanks hokie66. I found plenty of info using the search of this site as you said.

I would like some feedback about the connection of the stem of a cantilever or other retaining wall to the base. The two methods I know of are: 1. shear key at the junction of the stem to the base 2. roughened or scarified top of base in conjunction with added...

Does anyone have any experience with Lindapter's products(good or bad)? Also do you think it is good enough for me to use their literature and call it out on my document, or should I submit my design requirements to Lindapter? My problem is to use existing support steel without welding to it or...

Thanks to KootK and DETstru for the feedback.

I have an existing W16X26 spanning 18'-4".with no slab. We want to make it half composite(slab on one side only). However in order to have the slab at the desired elevation we have to add a 2 1/2" deep HSS filler which will have deck welded to it. The question is can we weld studs through the...

Thanks again bookowski for the info. Speaking for myself, I guess I am fearful of seeing such extremely slender buildings and wonder the advisability from a structural engineer's viewpoint of doing such a project.

Thanks for the information ,bookowski. I would be interested to know the order of magnitude of net uplift to be resisted as well as caisson diameter and anchorage.

There are apparently quite a few very slender buildings being built and/or already built in New York City. Some of these structures have height to width ratios of something like 14 to 1. Apparently they are concrete structures. I haven't done a lot of searches but I haven't seen anything written...

Thanks to all for your thoughts.

Any ideas on how to strengthen an existing spread footing and pedestal for increased column load? Present bearing 4 ksf; new bearing 9 ksf. Footing is 3.5ft x 3.5 ft x 1.0 thick. Footing is 5 ft below grade. No problem with owner suing.

How easy is it to convert/translate a STAAD file to a GTSTRUDL file? Can it be done only for a "simple" STAAD file or doesn't it matter how complicated the STAAD file is?

Thanks to all for the input.

Sorry 1985 and 1977.