Tests and Micro–Macro Cross-Scale Model of High-Performance Acrylate Viscoelastic Dampers Used in Structural Resistance

Dong, Yao‐Rong; Xu, Zhao‐Dong; Li, Qiang‐Qiang; He, Zhenhua; Yan, Xiao; Cheng, Yu

doi:10.1061/jsendh.steng-11767

Cited by 20 publications

(1 citation statement)

References 46 publications

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“…Reinforced concrete (RC) walls possess great lateral resistance and are widely used as important seismic components in building structures [1][2][3][4][5]. The T-shaped wall is an integrated component composed of two orthogonal wall segments.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on Seismic Performance of Slender T-Shaped RC Walls Subjected to Biaxial Loading

Wu,

Wang,

Shi

et al. 2024

Buildings

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To investigate the effects of parameters on the seismic performance of slender T-shaped RC walls subjected to a biaxial seismic action, a numerical model was established using a fiber-based cross-section and displacement-based beam–column element. The axial load ratio, shear span ratio, flange width to web height ratio, concrete strength grade, stirrup ratio, and longitudinal reinforcement ratio were selected for the parametric study, and the effects of these parameters on the performance degradation under biaxial loading were investigated. Furthermore, a sensitivity analysis of various parameters for the decrease was conducted. The results showed that the bearing and deformation capacities under biaxial loading were both decreased, and the total energy consumption was greater than that under uniaxial loading. The impacts of different parameters and loading paths on the decrease extent were significantly different, and the overall reduction was greater in the flange direction than in the web direction. Under the square loading path, the T-shaped wall had the greatest reduction in its seismic performance, followed by the eight-shaped and cruciform loading paths. The changes in the axial load ratio, shear span ratio, and concrete strength significantly affected the performance degradation under biaxial loading. Accordingly, it is recommended to reasonably consider the values of these three parameters in a multidimensional seismic design to maintain safety redundancy.

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Section: Introductionmentioning

confidence: 99%

Parametric Study on Seismic Performance of Slender T-Shaped RC Walls Subjected to Biaxial Loading

Wu,

Wang,

Shi

et al. 2024

Buildings

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Mechanical properties of viscoelastic materials subjected to thermal‐oxidative aging: An experimental and theoretical study

Li,

Xu,

Tong

et al. 2023

J of Applied Polymer Sci

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Viscoelastic materials (VEMs) made from rubber polymer will inevitably age due to the interactions with the harmful environment during service life, thus reducing the reliability of viscoelastic (VE) damping equipment installed in building structures. In order to understand and be able to predict the degradation of VE damping equipment, it is imperative to comprehensively study the influence of aging on the mechanical properties of VEMs. In this paper, a series of thermal‐oxidative (TO) aging tests and mechanical property tests are conducted on our previously developed VEMs to study effects of TO aging on the molecular chain structure and corresponding changes of macroscopic mechanical properties of VEMs. By classifying molecular chains of VEMS into elastic chains and free chains, the effects of different chemical reactions during TO aging on these two main chains and corresponding changes on macroscopic mechanical behaviors of VEMs are analyzed. This facilitates formulating a mathematical model that can characterize the mechanical behavior of TO aging VEMs. In conjunction with the experimental data, the accuracy and applicability of the proposed model are compared and verified. Sensitivity analyses of parameters involved in the proposed model are then performed. The experimental results demonstrate that the TO aging can degrade the deformation capability and harden the modulus of VEMs, which may adversely affect the performance of VE damping devices. The parameter analyses depict that the TO aging affects the macroscopic mechanical behavior of VEMs by altering the relative number and configuration of free chains and elastic chains as well as their respective contributions to the total stress of VEMs. The results point to the high accuracy of the proposed model in representing the strain–stress behavior of VEMs under different aging conditions.

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Experimental and mathematical model of the variable friction adaptive self‐centering energy dissipative brace

Liu

Zhu

Dong

et al. 2023

Earthq Engng Struct Dyn

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The self‐centering energy dissipative (SCED) brace can limit the maximum story drift and eliminate residual drift during an earthquake. The inadequate reliability or excessive complexity of the energy dissipative system, the contradiction between the energy dissipative system and self‐centering system, the limited elongation capacity, and the difficulty in replacement and reuse are the main challenges faced by the existing developed SCED brace. To solve these problems, a variable friction adaptive self‐centering energy dissipative (VFA‐SCED) brace has been proposed. First, the details of the VFA‐SCED brace are introduced, and the force analysis of each component and the working mechanism of the brace are expounded. Then, the equations that govern the brace performance have been derived, key parameters and mathematical models have been identified. Finally, the feasibility of the new system was demonstrated with a set of experiments, in which five specimens with different key parameters were fabricated, tested, and analyzed. The test results show that the hysteretic curve of the VFA‐SCED brace is typically flag‐shaped, and there is almost no residual deformation after multiple cyclic loadings, which means that the brace has good energy dissipative capacity and self‐centering ability, replaceable and recyclable for each component, and stable working performance. The elongation capacity, friction, energy dissipative capacity, and self‐centering ability can be changed by adjusting the relevant key parameters of the spring and wedge block, and the proposed mathematical model can well predict the force‐deformation hysteresis of the brace with different parameters. The results show that the VFA‐SCED brace successfully avoids the main obstacles of previous SCED braces.

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Tests and Micro–Macro Cross-Scale Model of High-Performance Acrylate Viscoelastic Dampers Used in Structural Resistance

Cited by 20 publications

References 46 publications

Parametric Study on Seismic Performance of Slender T-Shaped RC Walls Subjected to Biaxial Loading

Parametric Study on Seismic Performance of Slender T-Shaped RC Walls Subjected to Biaxial Loading

Mechanical properties of viscoelastic materials subjected to thermal‐oxidative aging: An experimental and theoretical study

Experimental and mathematical model of the variable friction adaptive self‐centering energy dissipative brace

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