@Participants: EN1 Engineer1 Student, AR1 Architect1 Student, EN2 Enginneer2
Student, AR2 Architect2 Student, PR1 Preservationist Student
@Media: firm, video
@Transcriber: Reed Stevens, September 2000
@Comment: fragment of discussion of retrofit schemes
@Comment: numbering is by TCUs and pauses, not lines
*EN2: let's look at what I, uh, what kind of demand capacity ratios I got
on the buildings for in plane forces. ▶
*EN2: using these people's criteria. ▶
*EN2: okay, now we're not using UBC criteria. ▶
*EN2: we're ⌈using this criteria. ▶
*AR1: ⌊no, no right yeh. ▶
*EN2: and uh, for example if we could look at one of the plans. ▶
*EN2: which one's on top? ▶
*AR1: this is Temescal. ▶
*AR1: (2.5) you can write on this if you want to. ▶
*EN2: now (1.) this is for seismic forces in this direction &=1 . ▶
%xco1: hand waves north and south over center of building
*EN2: this &=2 is the critical wall. ▶
%xco2: hand moves to west wall and finger sweeps along
*EN2: and I'm getting demand capacity ratios of one point five. ▶
*AR1: hmmm. ▶
*EN2: and, uh, one point one, ok? ▶
*EN2: and so, uh this wall &=1 is seriously overstressed. ▶
*EN2: we need to do something to that wall. ▶
%xco1: points to wall
%xco2: palm down hand opens, and bobs up and down over the west
*PR1: in ⌈plane? ▶
*EN2: ⌊in plane. ▶
*EN1: that is based on (1.) these walls &=1 helping you or not helping
you, Johnny? ▶
%xco1: points to N-S running wall in center of building with pencil
*EN2: its based on only using this wall &=1 and this wall &=2 , because
these walls &=3 are so, uh, short &=4 that they don't amount to any
capacity, alright? ▶
%xco1: left hand lays on edge of west wall ▶
%xco2: right hand lays on east wall ▶
%xco3: right hand comes to one segment of N-S running wall in bottom and
two fingers strectch over its length, then the same hand comes over
the paper moves towards to other N-S segment along the same parallel
%xco4: thumb and forefinger open upward toward preservationist to show him
*AR1: um hm. ▶
*EN2: uh (1.) so if I look at forces in this direction &=1 well now we've
got a lot of pie:rs &=2 , and my, uh (1.) and my demand capacity
ratios are close &=3 , hovering around one &=4 . ▶
%xco1: left hand moves across plan west to east and back ▶
%xco2: starting in the southwest corner of the plan and moving
counterclockwise around the building thumb and forefinger touch
down on segments along the south then north walls ▶
%xco3: palms down both hands come off the surface to waver in a gesture
of approximation ▶
%xco4: hands stop together parallel to page ▶
*AR1: +^ um hm. ▶
*EN1: +^ alright. ▶
*AR1: +^ um hm. ▶
*EN2: and my calculations are relatively approximate right now, okay
[% 1] ? ▶
%xco1: hands waver again as in Turn xxx, action 3
*EN2: uh (1.) but uh, so, what do we do to strengthen this building? ▶
*EN2: now we're not &e &y and we're &l, aiming at the general procedure.
*EN2: well it seems to me that if we put (1.) a seismic resisting element
he:re &=1 (1.) or here &=2 , or he:re, &=3 somewhere in that area
&=4 . ▶
%xco1: thumb and forefinger on a N-S region in south portion of plan
%xco2: thumb and forefinger on a N-S region in north portion of
%xco3: thumb and forefinger on a N-S region in north
portion of plan, just to the left of location in action 3 ▶
%xco4: thumb and forefinger slides back to south along same parallel ▶
*PR1: +^ mm hmm. ▶
*AR1: +^ mm hmm. ▶
*EN1: we can &=1 (1.) take force off of this wall &=2 . ▶
%xco1: right forefinger goes to region he just indicated where
they could put an element
%xco2: l hand with pointing finger moves along west wall
*EN1: then we would reanalyze that wall using the, the +... ▶
*AR1: mm hmm &=1 . ▶
%xco1: charles begins writing quickly ▶
*EN1: uh, &=1 &thi this code and uh, I suspect that the demand capacities
would drop below one. ▶
%xco1: points to code book ▶
*AR2: what do we +...
*AR2: what ⌈do we want to be below one?
*AR1: ⌊oh, okay.
*AR2: we want them ⌈to be below one.
*AR1: ⌈so the demand is not greater.
*EN2: ⌊ xxx.
*AR1: than the capacity.
*AR1: ⌈so that's where the one.
*AR1: ⌈ratio if it equals capacity its one, if its greater, yeh &=creaky
*AR2: ⌊ xxx.
*EN1: this would also, assist in the floor &=1 diaphram.
%xco1: l thumb and forefinger in same region where he's proposed an
element on south part of plan
*EN1: this &=1 one.
%xco1: r hand sweeps west to east
*AR1: mm hmm.
*EN1: I haven't gotten to the point.
%xco1: hand overs large floor area across plan
*EN1: I'm <right on the verge of it> [% faster], of looking at that
diaphram, to see if we exceed the six hundred pounds per lineal foot
that we, we have in that existing &=1 material.
%xco1: left and right hands go down on edges, one along
the east wall and the other in parallel in middle of plan
*AR1: mm hm.
*EN1: uh, somehow I think it just might work.
*EN1: uh, so right now that is, that conceptually is my scheme for this
*AR1: mm hmm.