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作者:

Zhong, Yun-Long (Zhong, Yun-Long.) | Li, Guo-Qiang (Li, Guo-Qiang.) | Xiang, Yang (Xiang, Yang.) | Wang, Yuan-Zuo (Wang, Yuan-Zuo.)

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EI Scopus SCIE

摘要:

In recent decades, various bar-typed miniature energy dissipaters with buckling restrained mechanisms have been proposed for seismic mitigation of engineering structures. The recently proposed assembled steel rod energy dissipater (ASRED), incorporating equally divided tubes as filler components, have shown plump hysteretic loops and remarkable fatigue performance. For such miniature dissipaters with varied dimensions, its ultra-low-cycle fatigue (ULCF) life is correlated with the geometrical dimensions. However, no research concerning this issue has been found. To enable the fracture prediction of ASREDs under various loading situations, numerical models integrated with the ductile fracture model were established in this paper. A newly proposed constitutive model and the famous combined hardening model were both employed in the numerical models to comparatively investigate the key factors affecting the accuracy of the fracture prediction. Moreover, the possible influence of Lode angle was also investigated by employing two different ductile fracture models, namely, the cyclic Bai-Wierzbicki model (CBWM) and the cyclic void growth model (CVGM). Seven specimens with different lengths and loading protocols were simulated, and the results show that the strain amplitude distributes unevenly in the ASRED and increases cycle by cycle at the fixed ends, which leads to the necking-induced failure mode. Using the fracture model of CBWM, numerical simulations that considers the influence of strain amplitude could suc-cessfully predict the fracture of all specimens. The dissipaters behaved approximately in an axially loaded state throughout the entire fatigue life, therefore the influence of the Lode angle was negligible, and the fracture predictions given by the CVGM are same with that by the CBWM. Based on a comprehensive analysis of the extended numerical investigations, an improved configuration for ASRED is proposed.

关键词:

Ductile damage Strain amplitude dependence Fatigue life prediction ULCF Energy dissipater

作者机构:

  • [ 1 ] [Zhong, Yun-Long]Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China
  • [ 2 ] [Li, Guo-Qiang]Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China
  • [ 3 ] [Xiang, Yang]Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China
  • [ 4 ] [Li, Guo-Qiang]Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China
  • [ 5 ] [Wang, Yuan-Zuo]Beijing Univ Technol, Key Lab Urban Secur, Disaster Engn Minist Educ, Beijing 100124, Peoples R China

通讯作者信息:

  • [Li, Guo-Qiang]Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China;;[Li, Guo-Qiang]Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;;

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来源 :

ENGINEERING STRUCTURES

ISSN: 0141-0296

年份: 2023

卷: 285

5 . 5 0 0

JCR@2022

ESI学科: ENGINEERING;

ESI高被引阀值:19

被引次数:

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SCOPUS被引频次: 4

ESI高被引论文在榜: 0 展开所有

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