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portal frame

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aenger

aenger

Structural
Nov 19, 2017
17
I am looking for some advices on the projects I am working on now. Any input will be much appreciated.
There are two existing concrete wall on the corner as shown below. So my question is, if I connect the steel column to wall, with roof bracing, can I rely these two walls to resist wind load from both directions instead make the the steel-column system to be portal frame?
112_bcenul.jpg


Simply put, can I use one wall on one side only to resist the whole lateral load in one direction for the structure? I mean, can I simply apply the whole lateral load on the wall in each direction to check the capacity?
Thanks in advanced.
 
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Unless the walls can resist out-of-plane loads, then you would need three walls to make this stable without a portal frame.
 
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Just curious: wouldn't only half the load get transferred to the concrete wall and half to the exterior column/wall each direction? In this case, the exterior columns or wall (if present) will need to be designed for the lateral load. Just my thoughts.
 
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aenger said:
Simply put, can I use one wall on one side only to resist the whole lateral load in one direction for the structure? I mean, can I simply apply the whole lateral load on the wall in each direction to check the capacity?
Click to expand...

No. Two important considerations.
1) The structure is going to torque when most of the lateral load goes into the one shear line. Therefore, you need to account for this torsion in the loads attributed to the two shear walls.

2) There will be a lot of extra deflection in the frames. You need to make sure the columns and footings and such can handle all the extra P-Delta effect of that deflection.
 
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