NCHRP 12-68 FY 2004 Rotational Limits for Elastomeric ... · FY 2004 Rotational Limits for...
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NCHRP 12-68
FY 2004
Rotational Limits for Elastomeric Bearings
Final Report
APPENDIX A
John F. Stanton
Charles W. Roeder
Peter Mackenzie-Helnwein
Department of Civil and Environmental Engineering
University of Washington
Seattle, WA 98195-2700
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TABLE OF CONTENTS
APPENDIX A TEST DATA A-1
A.1 Tests PMI 1a through PMI 1d. A-1
A.2 Tests PMI 4 through PMI 5. A-1
A.3 Cyclic Tests (CYC, SHR, MAT, SHF, ASR, PLT series) A-2
A.4 PMI Series A-4
A.5 CYC Series A-38
A.6 SHR Series A-97
A.7 SHF Series A-106
A.8 ASR Series A-116
A.9 MAT Series A-122
A.10 PLT Series A-128
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APPENDIX A TEST DATA
This appendix contains the data summary from each test. The tests can be broken into
three groups, for each of which the data presented is slightly different. Each specimen
has a test number (e.g. CYC5), which describes the loading, followed by a specimen
number (e.g. A2), which defines the manufacturer (A, B, C or D) and the batch number
(1 or 2). Details are given in the bearing test matrix, Chapter 2, Table 2-2.
A.1 Tests PMI 1a through PMI 1d.
The PMI series was intended to provide data points for the creation of Axial force-
Moment Interaction curves. The PMI 1 series were all tested under the 2400 kip
Baldwin Universal Test Machine, and were subjected to high average axial stresses (up to
12 ksi). In some cases a tapered plate was used to impose rotation as well. The rotation
could not be cycled independently of the axial load.
Each result is presented on a single page, which shows a numerical summary of the data,
and an axial force-displacement plot. The numerical summary contains the bearing
properties (gross dimensions, etc.), the test regime (axial stress, rotation, etc.) and the
results. The results are subdivided into the debonding history and the shim fracture
history, if any. The debonding history records the total length of shim over which
debonding occurred on the long edges. The maximum is 2 shims * 2 edges * 22 inches
each = 88 inches. Debonding could only be detected o the center two shims, because
holding plates from the rig obscured the outer two. The holding plates were needed to
prevent the bearing from slipping out of place.
A.2 Tests PMI 4 through PMI 5.
These specimens were subjected to a single slow cycle of rotation (referred to as
monotonic rotation) plus a constant axial load. To achieve this they were tested in the
rotation rig, which has an absolute maximum axial capacity of 800 kips. The stresses are
therefore smaller than those reached in the PMI 1 series.
The numerical data summary is similar to that presented for the PMI 1 series. Because
debonding occurred on the compression side of the bearing, and a complete cycle of
rotation was imposed, debonding during the positive and negative parts of the rotation
cycle are recorded separately (i.e. they occurred on different sides of the bearing).
Debonding progressed during the loading quarter cycles but not during the unloading
quarter cycles. The next two pages for each PMI 4 and 5 test show the history of the
bulge heights as a function of rotation angle. The bulge height for each of the three
layers is given separately.
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A.3 Cyclic Tests (CYC, SHR, MAT, SHF, ASR, PLT series)
For each of the cyclic tests of the CYC and other series, two pages of summary data are
presented. The first sheet contains the numerical summary and three plots. The second
page shows the bulge height history.
The numerical data summary contains the specimen data and the loading regime, as for
the two previous series. However, the debonding is expressed as a percentage of the full
length, because in some cases the bearings were not the standard size of 22” x 9”. The
debonding is also related to the cycle count. Because both debonding and readings
occurred at irregular times, the results from each test were interpolated to provide cycle
counts at fixed debonding “milestones” of initial, 25%, 50%, 75% and 100% debonded.
The rotational stiffness of the bearings was also measured at different times throughout
the test, and the initial and final values are presented. Because the true response was
slightly hysteretic, an equivalent elastic stiffness was obtained by fitting a straight line to
two cycles of data, using a least squares technique. The theoretical rotational stiffness
value from the Linear Model is also provided. It used a G modulus that was based on the
hardness supplied by the manufacturer. The shear strains due to the constant axial load
and cyclic rotations were calculated from the Linear Model and are given as well. Finally
the energy dissipated per cycle (EDC) and the Equivalent Viscous Damping (EVD) were
obtained from the properties of the hysteresis loops.
Similar data are given in graphical form. The first plot, (a), shows the debonding history
(expressed as an absolute length vs. cycle count). Separate curves show the progression
on the top and bottom of the bearing. Plot (b) shows the moment-rotation relationship for
the initial and final cycles. Plot (c) shows the variation with cycling of the rotational
stiffness, the EDC and the EVD, each normalized with respect to the initial value. In
many cases, sudden jumps in the plot (c) curves can be seen. These represent pauses in
the testing for taking photos or bulge height readings, and in some cases overnight,
during which the elastomer recovered some of the stiffness and other properties that had
been temporarily lost during cycling. This issue is discussed in more detail in
Appendix D.
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A.4 PMI Series
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A.5 CYC Series
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- A-57 -
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- A-58 -
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- A-59 -
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- A-60 -
CYC9-A1
Figure A.56: Test CYC9-A1 Summary
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- A-61 -
Figure A.57: CYC9-A1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-62 -
CYC9-A2
Figure A.58: Test CYC9-A2 Summary
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- A-63 -
Figure A.59: CYC9-A2 Bulge Heights (a) Top of Bearing and (b) Bottome
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- A-64 -
CYC9-B1
Figure A.60: Test CYC9-B1 Summary
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- A-65 -
Figure A.61: CYC9-B1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-66 -
CYC9-C1
Figure A.62: Test CYC9-C1 Summary
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- A-67 -
Figure A.63: CYC9-C1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-68 -
CYC9-D1
Figure A.64: Test CYC9-D1 Summary
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- A-69 -
Figure A.65: CYC9-D1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-70 -
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- A-71 -
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- A-72 -
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- A-73 -
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- A-74 -
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- A-75 -
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- A-76 -
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- A-77 -
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- A-78 -
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- A-79 -
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- A-80 -
CYC12-A1
Figure A.76: Test CYC12-A1 Summary
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- A-81 -
Figure A.77: CYC12-A1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-82 -
CYC12-A2
Figure A.78: Test CYC12-A2 Summary
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- A-83 -
Figure A.79: CYC12-A2 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-84 -
CYC12-B1
Figure A.80: Test CYC12-B1 Summary
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- A-85 -
Figure A.81: CYC12-B1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-86 -
CYC12-C1
Figure A.82: Test CYC12-C1 Summary
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- A-87 -
Figure A.83: CYC12-C1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-88 -
CYC12-D1
Figure A.84: Test CYC12-D1 Summary
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- A-89 -
Figure A.85: CYC12-D1 Bulge Heights (a) Top of Bearing and (b) Bottom
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- A-90 -
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- A-91 -
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- A-92 -
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- A-93 -
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- A-94 -
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- A-95 -
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- A-96 -
THIS PAGE WAS INTENTIONALLY LEFT BLANK
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- A-97 -
A.6 SHR Series
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- A-98 -
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- A-99 -
(a) Top
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- A-100 -
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- A-101 -
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- A-102 -
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- A-103 -
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- A-104 -
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- A-105 -
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- A-106 -
A.7 SHF Series
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- A-107 -
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- A-108 -
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- A-109 -
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- A-110 -
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- A-111 -
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- A-112 -
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- A-113 -
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- A-114 -
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- A-115 -
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- A-116 -
A.8 ASR Series
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- A-117 -
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- A-118 -
(a) Top
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- A-119 -
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- A-120 -
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- A-121 -
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- A-122 -
A.9 MAT Series
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- A-124 -
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- A-125 -
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- A-126 -
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- A-127 -
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- A-128 -
A.10 PLT Series
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- A-129 -
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- A-130 -
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- A-131 -
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- A-132 -
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- A-133 -
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- A-134 -
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- A-135 -
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- A-136 -
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- A-137 -
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- A-138 -
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- A-139 -
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- A-140 -