What is the best strategy for shoring a structure during the partial demolition of a load-bearing wall in a renovation project?

[Laura_mr]

What is the best strategy for shoring a structure during the partial demolition of a load-bearing wall in a renovation project?
I am working on the renovation of an old building where we need to partially demolish a load-bearing wall to create a new opening. My main concern is how to ensure the structural stability during the demolition process and before installing the new structural support (such as a reinforced beam or a steel frame).
Some specific questions:

1. What type of shoring system do you recommend based on your experience (telescopic props, transfer beams, structural scaffolding, etc.)?
2. How can I calculate the maximum time the structure can remain unsupported without compromising safety

I would really appreciate any advice or insights from similar projects. Thanks in advance!

 

[ANE91]

1. Depends on the wall and what it’s supporting. Each shoring system has advantages and disadvantages. I’ve spec’d wood shore frames, screw jacks, steel shore towers, etc. Your contractor can tell you what they’d like to use. Proprietary systems often carry published capacity tables.

2. I suspect that your answer can be found in ASCE 37. The load factors are adjusted to account for longer durations. I can’t say for certain whether ASCE 37 takes a target reliability approach, as ASCE 7 does. You’re likely to get a better answer from someone who designs shoring for a living (not me).

 

[JAE]

1. What type of shoring system do you recommend based on your experience (telescopic props, transfer beams, structural scaffolding, etc.)?

Yes - depends on the structure, framing orientation, etc. Usually need a very experienced contractor or a structural engineer to advise.

1. How can I calculate the maximum time the structure can remain unsupported without compromising safety

No one here would have any idea on "how to calculate" the time. You need "boots on the ground" to look at it and properly design the shoring.

Really nonsensical questions, here. Even with fifty photos and diagrams there'd still be a need to actually see it in person.