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DAMAGE-SURVEY DATA FOR STRUCTURE 3.1.3
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APPENDIX B
B.1
EXTERIOR-WALL-DISPLACEMENT MEASUREMENTS
The locations of the survey points are shown in Fig, 2.3. Offeste were measured froma
vertical plane to these aurvey pointa after Operation Ivy, Similar pretest measurements are
available as posttest measurements of Operation Greenhouse.’For each vertical row of
survey points, the distance to the base point was subtractes (rom aul measurements, the re-
mainder being the horizonta} distance between the base point and the survey point, shown in
Table B.1 as “offset from vertical at base point.” The difference between the ore-Ivy and postIvy measurements 1s then shown as “net lateral displacement.” The displacement for front and
back ia positive if away {rom Ground Zero, and for the ends it 's positive if it {a toward the inaide of the building.
B.2
COLUMN-OFFSET MEASUREMENTS
The locations of the columns in Buildings 2, 3, 5, and 6 are shown in Fig, B.1. Horizontaloffset measurements were made from a vertical line to the front or rear face at the (op and
bottom of sach column of each story of there huiidings. The differsnce of the offset measurements indicates the total permanent dispiace neni of the top of ca, culumn relative to the botiom
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of the column, [Ihe relaiiv. c.cplacements thus determinsa are iabulsted in Table B.2, 2
positive sign ird cating motion of the column top away from Ground Zerg.
B.3)
ROOF-ELEVATION MEASUREMENTS
The iocations of the roof survey points are shown in Fig. 2.3. li the level survey the elevations of the points were devermined relative to an arbitrary datum plane since no bench masks
were available with which to determine the Seolute elevations. tn reducing the field data, tua
posttest elevationa were vied to the pretest elevations by assuming that the average elevation
of the four corner points of Building 4 remained unchanged. The post-lvy elevations (hvs 05tained and the pre-Ivy elevations obiained from references 9 and i0 are tabulate’ in Tatie B.3,
The difference hetween these elevations for each print gives the vertical displacement of the
roof, upward displacements being indicated by a positive sign.
128
SECRET— RESTRICTED DATA