文献类型：期刊文献

英文题名：Quantification of higher mode effects of steel frame and control method using dual self-centering variable friction damper brace

作者：Wang, Yongwei Zhou, Zhen Zhang, Lingxin Xie, Qin

第一作者：Wang, Yongwei

通信作者：Zhou, Z[1]

机构：[1]China Earthquake Adm, Inst Engn Mech, Key Lab Earthquake Engn & Engn Vibrat, Harbin 150080, Peoples R China;[2]Southeast Univ, Key Lab Concrete & Prestressed Concrete Struct, Minist Educ, Nanjing 210096, Peoples R China;[3]Guizhou Inst Technol, Sch Civil Engn, Guiyang 550003, Peoples R China

第一机构：China Earthquake Adm, Inst Engn Mech, Key Lab Earthquake Engn & Engn Vibrat, Harbin 150080, Peoples R China

通信机构：corresponding author), Southeast Univ, Key Lab Concrete & Prestressed Concrete Struct, Minist Educ, Nanjing 210096, Peoples R China.

年份：2021

卷号：240

外文期刊名：ENGINEERING STRUCTURES

收录：;EI(收录号：20211710268950);Scopus(收录号：2-s2.0-85104797559);WOS:【SCI-EXPANDED(收录号:WOS:000659321000004)】；

基金：The authors would like to acknowledge financial supports from "Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2019EEEVL0303) ", "National Key Research and Development Program of China (Grant No. 2018YFC0705700) ", "National Natural Science Foundation of China (Grant No. 51878150) ". These supports are gratefully acknowledged.

语种：英文

外文关键词：Self-centering braced frame; Variable friction damper; Higher mode effect; Modal decomposition; Parametric analysis

摘要：Self-centering energy dissipation braced frames (SCEDFs) have been developed to satisfy the requirements of resilience. However, low post-yield stiffness in such systems often leads to a higher mode effect, resulting in a significant deformation concentration that may exceed the design objectives. A novel dual self-centering variable friction damper (DSC-VFD) brace with high post-yield stiffness and enhanced energy dissipation capability was proposed. Its hysteretic behavior, characterized by a loading stiffness that is larger than the unloading stiffness, was developed by incorporating the C++ language into the OpenSees platform. To evaluate the higher mode effect in different types of frames, a quantification measure based on the higher mode results of the steel frames, considering the seismic responses around the peak value, was therefore established. Then, the seismic responses of the DSC-VFD frames (DSC-VFDFs) using the proposed uniaxial material were calculated and compared with those of the traditional moment resisting frame (MRF) and SCEDF with the same design process. Finally, the four parameters, including the first stiffness modification coefficient alpha 1, second stiffness ratio alpha 2, strength ratio beta, and fourth stiffness ratio alpha 4, were considered to evaluate their influences on nonlinear seismic responses and the higher mode effect of the DSC-VFDF by the above-mentioned quantification measures. The results indicate that the influence of higher modes should not be ignored in the design of self-centering braced frames, and the higher mode quantification results of base shear are more sensitive than those of effective displacement. The DSC-VFD brace can more effectively improve the seismic responses and control the higher mode effect than the traditional SCEDF.