双段摇摆墙-框架结构的动力特性
Dynamic properties of double-segment rocking wall-frame structure
朱春阳 1何翔雨 1孙丽1
作者信息
- 1. 沈阳建筑大学土木工程学院,辽宁 沈阳 110168
- 折叠
摘要
针对高层摇摆墙-框架结构,可将摇摆墙分段铰接以降低其刚度及内力需求.为分析双段摇摆墙-框架结构的动力特性,探究摇摆墙的合理分段位置,基于弯曲梁-剪切质量模型建立单、双段摇摆墙-框架结构的等效动力方程,在此基础上对比分析摇摆墙分段位置对结构周期、振型及底部剪力的影响规律,开展有限元算例验证理论分析的合理性.研究发现:弯曲梁-剪切质量模型可以合理反映摇摆墙分段位置变化条件下整体结构动力响应规律.摇摆墙分段位置位于墙体中下部时,结构二阶模态贡献显著,受此影响,结构周期较单段摇摆墙-框架延长幅度较高,结构基底剪力下降.反之,当分段位置位于结构中上部时,结构变形以一阶模态为主,基底剪力较单段摇摆墙-框架提升.
Abstract
For the high-rise rocking wall-frame structure,the rocking wall can be segmented and hinged to reduce its stiffness and internal force requirements.To study the dynamic properties of the double-segment rocking wall-frame structure and explore the reasonable segmentation position of the rocking wall,the equivalent dynamic equations of the single and double-segment rocking wall-frame structures were established based on the bending beam-shear mass model.On this basis,the influence of the segmentation position of the rocking wall on the structural period,vibration mode and bottom shear force was compared and analyzed.The finite element case study was carried out to verify the rationality of the theoretical analysis.It was found that the bending beam-shear mass model could reasonably reflect the dynamic performance of the whole structure under the condition of adjusting the segment position of the rocking wall.When the segment section was located in the middle and lower part of the structure,the second-order modal contribution of the structure was significant.Affected by this,the structural period was increased compared with the single-segment rocking wall-frame,and the base shear force of the structure decreased.On the contrary,when the segment position was located in the middle and upper part of the structure,the structural deformation was dominated by the first-order mode,and the base shear force was higher than that of the single-segment rocking wall-frame.
关键词
力学模型/摇摆墙-框架结构/时程分析/基底剪力Key words
mechanical model/rocking wall-frame structure/time-procedure analysis/base shear引用本文复制引用
出版年
2024
NETL
NSTL
万方数据