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Masonry Shearwall "Rw"

Masonry Shearwall "Rw"

Masonry Shearwall "Rw"

(OP)
For design of reinforced masonry shearwalls, UBC97 Sec. 2108.2.5.6 references "Rw" = 1.5.  What is this?  A remnant from the 94 UBC?  It is not listed as a variable, as far as I have seen.  How should one apply it to boundary member design?  Regards,

RE: Masonry Shearwall "Rw"

(OP)
Thank you for the clarification, Taro.  On a related subject, can someone explain how to apply Section 2108.1.4.3.2:  "The value of phi may be 0.80 for any shear wall when its nominal shear strength exceeds the shear corresponding to development of its nominal flexural strength for the factored-load combination."  I can calculate a "nominal shear strength," but the other half of this comparison is quite confusing. Thanks again.

RE: Masonry Shearwall "Rw"

Draw a free body diagram of the wall pier showing the moments and shears required for equilibrium.  For single story cantilever piers, the shear will be V = M/h where h is the pier height.  For single story fixed piers, the shear will be V = 2M/h.  For multi-story piers, it's a bit more complicated, but you can figure it out with the free body diagram.

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