SD-Lecture17-What-is-a-Shear-Wall

SD-Lecture17-What-is-a-Shear-Wall - Lecture#17 What is a...

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Lecture #17 What is a shear wall ? Consider the simple analogy of a typical residential interior stud wall.
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Consider a 12’ long by 8’ high stud wall sitting on a concrete slab.
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A stud wall is built from 2”x 4” wooden or steel studs placed every 16” on center, with 2”x 4” pieces at the top and the bottom.
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The studs are secured with “toe-nailing” 10d nails @ 30º.
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Consider now the application of a large horizontal load to the stud wall coming from wind or seismic loads. 1000 lbs
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The shear wall will “rack” and some nails are pulled out. 1000 lbs The dotted lines represents the original structure
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As the load is continually applied, the stud frame racks more and more until it collapses. 1000 lbs
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Eventually, the stud wall collapses, as this California house.
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Now reinforce the structure with 4’ x 8’ plywood or drywall sheets. The dotted lines represent the stud walls.
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When the shear wall is now pushed, it does not deform but rather slides to the right.
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SD-Lecture17-What-is-a-Shear-Wall - Lecture#17 What is a...

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