Vertical Irregularity

[MOOK]

If you have 4 story building, the building has shear walls in the upper 3 stories but it does not have one i the first story. Do you consider this Vertical Irregularity Type (4) or not?

 

[parthurvt]

If you have 4 story building, the building has shear walls in the upper 3 stories but it does not have one i the first story. Do you consider this Vertical Irregularity Type (4) or not?

I think I would consider that a Type 1b Vertical Irregularity - Extreme Soft Story. Type 4 would be if there was a shear wall in the first story but located in a different place.

 

[MOOK]

If you have 4 story building, the building has shear walls in the upper 3 stories but it does not have one i the first story. Do you consider this Vertical Irregularity Type (4) or not?

I think I would consider that a Type 1b Vertical Irregularity - Extreme Soft Story. Type 4 would be if there was a shear wall in the first story but located in a different place.

Well, Vertical Irregularity type (4) also exists if there is change in stiffness between stories. Can not we consider that the stiffness in the first story became = zero and as a result, consider it vertical irregularity type (4).

I am saying this because I am trying to figure out why some text books consider it vertical irregularity type (4).

Thanks

 

[parthurvt]

If you have 4 story building, the building has shear walls in the upper 3 stories but it does not have one i the first story. Do you consider this Vertical Irregularity Type (4) or not?

I think I would consider that a Type 1b Vertical Irregularity - Extreme Soft Story. Type 4 would be if there was a shear wall in the first story but located in a different place.

Well, Vertical Irregularity type (4) also exists if there is change in stiffness between stories. Can not we consider that the stiffness in the first story became = zero and as a result, consider it vertical irregularity type (4).

I am saying this because I am trying to figure out why some text books consider it vertical irregularity type (4).

Thanks

That's strange about the textbooks, I guess you could consider it a type (4) since there is a reduction in stiffness. However I do still maintain that 1b fits this particular situation more closely.

 

[greatjohn]

Irregularity 4 may apply. since Type 1 and 5 actually are judged based on the contribution of the whole story.

 

[MOOK]

Good point