Experimental and analytical study on design performance of full-scale viscoelastic dampers

Wang, Shiang‐Jung; Chiu, I-Chung; Yu, Chung-Han; Chang, Kuo‐Chun

doi:10.1007/s11803-018-0469-2

Cited by 16 publications

(16 citation statements)

References 16 publications

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“…The design (or pre‐damage) performance of Specimens A and B tested before under a maximum shear strain of 60% with excitation frequencies of 0.3 and 1 Hz and at ambient temperatures of 10°C, 20°C, and 30°C is shown in Figure . The calculated characteristics of Specimen A, including the average shear storage stiffness K d , avg , damping coefficient C d , avg , and maximum shear force response F max, avg considering the test data of the intermediate five complete cycles (ie, excluding the beginning half and ending half cycles) as calculated, respectively, in Equations to , as well as the maximum shear force response F max, beginning obtained from the beginning half cycle, are tabulated in Table for better comparison.…”

Section: Experimental Studysupporting

confidence: 65%

“…The two exactly identical full‐scale VE dampers in configuration and material are chosen as the test specimens in this study, denoted as Specimens A and B hereafter and as presented in Figure . Both were manufactured by the Nippon Steel Engineering Corporation, and their design (or pre‐damage) performance under maximum shear strains ( γ max ) not greater than 300% have been tested in Wang et al's research . Note that the fixing plates shown in Figure will be disassembled after installing and before testing the VE damper specimens.…”

Section: Experimental Studymentioning

confidence: 99%

“…Afterward, likewise, the tests under maximum shear strains of 60% and 200%, which are also termed as the residual performance tests hereafter, were conducted on Specimen B. For each test condition in this study, an excitation frequency of 0.3 Hz, an ambient temperature of 20°C, and a cycle number of six are adopted, which are identical to those adopted in Wang et al's research . Note that for adequately cooling the specimens, there is a resting time period between performing each test condition.…”

Section: Experimental Studymentioning

confidence: 99%

“…Experimental design performance of Specimens A and B under 60% shear strain [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Experimental Studymentioning

confidence: 99%

“…The temperature distribution contours of the five thermocouples, respectively, embedded in the first and second VE material layers of Specimen A at the instant of 63 seconds after starting the test with 600% shear strain are presented in Figure B. Similar to the observation from the previous design performance tests, the temperature rise within the VE material reaches the maximum at the ending of external disturbance. Afterward, the temperature is lowered through conduction and radiation and then gradually returns to be approximately identical to the ambient temperature.…”

Section: Experimental Studymentioning

confidence: 99%

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Experimental beyond design and residual performances of full‐scale viscoelastic dampers and their empirical modeling

Wang

Chiu

et al. 2019

Earthq Engng Struct Dyn

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Summary Most past researches relevant to viscoelastic (VE) dampers, regardless of analytical and experimental ones, aimed at their design (or pre‐damage) performance. In reality, however, under maximum considered or greater shaking caused by earthquakes, the shear deformation of the VE dampers installed in a structure may exceed or is even much larger than their nominal design range, thus leading to damage to the VE material. Under this circumstance, the structural design might become not conservative when the viscoelastically damped structure is a retrofit design or is not a supplemental damping design. Therefore, in this study, the beyond design and residual performances of the full‐scale VE dampers after suffering damage are experimentally probed and compared with their design (or pre‐damage) performance tested before. To have more engineering sense in practice, some suitable and conservative empirical post‐damage models through considering reduction factors in the Kelvin‐Voigt model for assessing the beyond design and residual performances of the full‐scale VE dampers after suffering damage are recommended.

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