东南大学学报（英文版）2020，Vol.36Issue(1)：56-66,11.DOI:10.3969/j.issn.1003-7985.2020.01.008
采用分布参数模型考虑高阶模态对底部带BRBs的铰支墙-框架结构的影响
Higher mode effects in hinged wall with BRBs in base-frame structures using distributed parameter models
摘要
Abstract
To investigate the effect of higher modes on the displacement and inner forces in HWBB ( hinged wall with buckling-restrained braces in base)-frame structure, distributed parameter models for both the HWBB-hinged frame structure and the HWBB-MRF ( moment resisting frame) structure are built. The hinged wall is simplified as a flexural beam. BRBs ( bucking-restrained braces ) are simplified to a rotational spring. MRF is simplified to a shear beam. Vibration equations of distributed parameter models are derived. Natural periods, natural modes of vibration, inner forces and displacements of the distributed parameter models are derived based on the vibration equations using numerical methods. The effect of the relative stiffness ratio and the rotational stiffness ratio on the higher mode effects is investigated. For elastic structures, the global displacement and shear in MRF are predominantly controlled by the first mode, while the shear and bending moment in the wall are significantly affected by higher mode effects. The effect of the yielding of BRB on the inner forces distribution in the HWBB-hinged frame is investigated. The results indicate that the first mode will no longer contribute to the inner forces and the contribution from higher modes to inner forces increases after the BRBs yield. Displacement is not sensitive to higher mode effects and it is controlled by the first mode after the BRBs yield. Parameter analysis demonstrates that the displacement amplitudes are reduced with the increase in the flexural stiffness of the wall before the flexural stiffness reaches a certain value. The first three periods decrease with the increase in the rotational stiffness. With the increase in the rotational stiffness ratio, the contribution from the first mode decreases while contributions from both the second mode and third mode increase.关键词
铰支墙/高阶模态/弯曲梁/转动弹簧/转动刚度比Key words
hinged wall/higher mode effects/flexural beam/rotational spring/rotational stiffness ratio分类
建筑与水利引用本文复制引用
杨晓燕,吴京,庞熙熙,王强,张萌..采用分布参数模型考虑高阶模态对底部带BRBs的铰支墙-框架结构的影响[J].东南大学学报（英文版）,2020,36(1):56-66,11.基金项目
The National Key Research and Development Program of China ( No. 2018YFC0705802) , the National Natural Science Founda-tion of China( No. 51978165), the Fundamental Research Funds for the Central Universities ( No. 3205007720) , Postgraduate Research and Prac-tice Innovation Program of Jiangsu Province ( No. 3205007720) . （ No. 2018YFC0705802）
