Im adding some further info regarding shear walls. Tony brought up a good point asking where you would place shear walls in irregular shaped buildings to account for the three dimensional forces brought about by an earthquake. Well heres my answer:
-Shear walls should create a box.
-Shear walls should be located on each level of the structure including the crawl space.
-Shear walls should create a box structure
-To be effective, shear walls should be equal length and placed symmetrically on all four exterior walls of the building.
For irregular shaped buildings the shear walls should be placed at regular intervals along the length of the wall on every storey. Or a whole wall can act as a shear wall extending up through multiple floors. Heres an interesting article of a curved shear wall if anyone is interested.
http://livebuilding.queensu.ca/building_systems/structural_design/shear_wall_loading
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