ISO 22762-6:2022 エラストマー耐震アイソレータ— Part 6: 高耐久性と高性能の仕様と試験方法 | ページ 6

3.1

allowable tensile strain

tensile strain whose influence on shear properties does not exceed a certain range

3.2

breaking

rupture of elastomeric isolator (3.8) due to compression- (or tension-) shear loading

3.3

buckling

state when elastomeric isolators (3.8) lose their stability under compression-shear loading

3.4

compressive properties

K_v

compressive stiffness for all types of rubber bearings

3.5

cumulative shear strain

sum of shear strain of a seismic-protection isolator when it is repeatedly deformed many times

3.6

design compressive stress

long-term compressive force on the elastomeric isolator (3.8) imposed by the structure

3.7

effective width

rectangular elastomeric isolator (3.8) smaller of the two side lengths of inner rubber to which direction shear displacement is not restricted

3.8

elastomeric isolator

rubber bearing, for seismic isolation of buildings, bridges and other structures, which consists of multi-layered vulcanized rubber sheets and reinforcing steel plates

3.9

first shape factor

ratio of effectively loaded area to free deformation area of one inner rubber layer between steel plates

3.10

high-damping rubber bearing

HDR

elastomeric isolator (3.8) with relatively high damping properties obtained by special compounding of the rubber and the use of additives

3.11

horizontal biaxial loading dependency

horizontal biaxial loading effect on various properties

3.12

horizontal shear creep test and residual shear strain test

changes in horizontal deformation that occur when the elastomeric isolator (3.8) is subjected to a constant horizontal force for a long time due to strong winds such as a typhoon, and residual deformation after unloading

3.13

inner rubber

rubber between multi-layered steel plates inside an elastomeric isolator (3.8)

3.14

lead rubber bearing

LRB

elastomeric isolator (3.8) with a lead plug or lead plugs press fitted into a hole or holes of the isolator body to achieve damping properties

3.15

linear natural rubber bearing

LNR

elastomeric isolator (3.8) with linear shear force-deflection characteristics and relatively low damping properties, fabricated using natural rubber

Note 1 to entry: Any bearing with relatively low damping can be treated as an LNR bearing for the purposes of isolator testing.

3.16

roll-out

instability of an isolator with either dowelled or recessed connection under shear displacement

3.17

routine test

test for quality control of the production isolators during and after manufacturing

3.18

second shape factor

<circular elastomeric isolator> ratio of the diameter of the inner rubber (3.13) to the total thickness of the inner rubber

3.19

second shape factor

<rectangular or square elastomeric isolator> ratio of the effective width (3.7) of the inner rubber (3.13) to the total thickness of the inner rubber

3.20

shear strain dependency of allowable tensile strain

influence of the allowable tensile strain (3.1) due to a change of shear strain of elastomeric isolator (3.8)

3.21

shear strain dependency of tensile yield strength

influence of the tensile yield strength due to a change of shear strain of elastomeric isolator (3.8)

3.22

standard value

value of the isolator property defined by the manufacturer based on the results of the type test

3.23

structural engineer

engineer in charge of designing the structure for base-isolated bridges or buildings and responsible for specifying the requirements for elastomeric isolators (3.8)

3.24

tensile fracture strain

strain at which elastomeric isolator (3.8) breaks in the tensile direction

3.25

type test

test for the verification of either material properties and isolator performances during the development of the product or the achievement of the project design parameters

3.26

ultimate property

property at either buckling (3.3) , breaking (3.2) , or roll-out (3.16) of an isolator under compression-shear loading

3.27

ultimate properties under horizontal biaxial loading test

critical characteristics of elastomeric isolators (3.8) when loaded in two directions in the horizontal plane

3.28

ultimate property diagram

UPD

diagram giving the interaction curve of compressive stress and buckling (3.3) strain or breaking (3.2) strain of an elastomeric isolator (3.8)