Efficiency of Double skin Steel-Plate Shear-Wall Core for steel buildings 1

Have a look to the following doc. You will see a lot of answers .



Use it up, wear it out;
Make it do, or do without.

NEW ENGLAND MAXIM

thanks HTURKAK, did you involved in any exterior steel strengthening of RC buildings ? (similar to 2nd picture)
Here we have many buildings that need similar techniques, especially old hospital buildings (20 to 40 years old) ?
I was thinking that using a new embedded steel shaft (from Bot footing to top roof) will do the same job as the exterior net-shape strengthening.
correct me if was wrong ?

Not external steel bracing but once , i decided to add external shear walls keeping symmetry. The external frame with vertical bracing could be viable solution for some cases .( e.g. If you can keep the symmetry , if you have blind external walls ...).Adding external frames will require
to improve the foundation , add new perimeter ftg etc.


That could be also an option. But i would prefer adding 3D vertical truss at elevator shafts , staircase shafts ( Other retrofitting methods ; jacketing of the columns ,adding new shear walls with changing the infilled walls to shear walls , post tensioning , seismic isolation, externally bonded FRPs...) There is no unique solution.

I will suggest you to look to the following novel docs.
- ASCE-SEI 41-13 American Society of Civil Engineers seismic evaluation and retrofit of existing buildings
- Retrofitting of concrete structures by externally bonded FRPs, 35-FIB - The International Federation for Structural Concrete
- Seismic Design, Assessment and Retrofitting of Concrete Buildings_ based on EN-Eurocode 8-Springer Netherlands



Use it up, wear it out;
Make it do, or do without.

NEW ENGLAND MAXIM

Many thanks, HTURKAK for your valuable references..