masonry shearwall rw
 

masonry shearwall "rw"
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,
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per the january 2001 errata, it should be revised to "r equal to 1.1". you can download all the errata from:
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.
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.