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Research Papers

Experimental Assessment of High Damping Rubber Under Combined Compression and Shear

[+] Author and Article Information
Virginio Quaglini

Department of Architecture,
Built Environment and Construction
Engineering A.B.C.,
Politecnico of Milano,
Piazza Leonardo da Vinci 32,
Milano 20133, Italy
e-mail: virginio.quaglini@polimi.it

Paolo Dubini

Department of Architecture,
Built Environment and Construction
Engineering A.B.C.,
Politecnico of Milano,
Piazza Leonardo da Vinci 32,
Milano 20133, Italy
e-mail: paolo.dubini@polimi.it

Giacomo Vazzana

Materials Testing Laboratory,
Politecnico of Milano,
Piazza Leonardo da Vinci 32,
Milano 20133, Italy
e-mail: giacomo.vazzana@polimi.it

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received May 6, 2015; final manuscript received August 20, 2015; published online September 24, 2015. Assoc. Editor: Huiling Duan.

J. Eng. Mater. Technol 138(1), 011002 (Sep 24, 2015) (9 pages) Paper No: MATS-15-1112; doi: 10.1115/1.4031427 History: Received May 06, 2015; Revised August 20, 2015

High damping rubber (HDR) is used in the manufacturing of elastomeric bearings for seismic isolation of building and structures. In practical situations, rubber bearings are subjected to a permanent vertical load which may change at the occurrence of the earthquake, and concurrent shear deformation, due to either service movements of the structure or earthquake-induced ground motion. The study presents an experimental procedure for the assessment of HDR specimens under combined compression and shear, reproducing the same typical load regimes which rubber isolators experience in service. Five commercial HDRs were tested according to the procedure. The results point to the importance of considering the influence of the compression stress for a correct understanding of the behavior of HDRs under cyclic shear.

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Figures

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Fig. 1

Principle of operation of HDRBs: (a) undeformed configuration in shear, subjected only to the gravity load W of the superstructure and (b) typical deformation produced by seismic actions (FH = shear force, dH = shear displacement)

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Fig. 2

Typical shear stress–strain diagram of HDR

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Fig. 3

Sketch of the biaxial testing system

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Fig. 4

Illustration of HDR test pieces: (a) Type 1 (shape factor S = 5.83) and (b) Type 2 (S = 1.0)

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Fig. 5

Rubber specimens at the end of the test sequence: (a) Type 1 test piece and (b) Type 2 test piece

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Fig. 6

Examples of shear stress–strain curves at different levels of compression stress for a soft, a normal, and a hard HDR. Curves determined at the third cycle of shear for each stress level.

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Fig. 7

Compression stress–strain curves stress for a soft, a normal and a hard HDR (data points relevant to the pressure steps in the combined compression and shear test protocol)

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Fig. 8

Influence of compression stress p and number of cycles on shear modulus (left diagrams) and equivalent viscous damping factor (right diagrams): (a) Soft1; (b) Normal2; and (c) Hard1

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Fig. 9

Variation of shear modulus (a) and equivalent viscous damping factor (b) as a function of the compression stress

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Fig. 10

Variation of shear modulus (a) and equivalent viscous damping factor (b) as a function of the compression stress: values normalized to the properties at p = 0 MPa

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