加强层弯曲刚度对框架-核心筒结构振动特性影响

作者:王四清 陈宇 沈蒲生
单位:湖南省建筑设计院集团股份有限公司 湖南省建筑设计院集团股份有限公司新型复杂结构研究中心 湖南大学土木工程学院
摘要:假定外框柱的轴向刚度与核心筒的弯曲刚度沿结构高度不变,忽略转动惯量的影响,同时认为水平伸臂与外框柱铰接,与核心筒刚接。基于分布参数体系的振动理论,考虑核心筒剪切变形和加强层弯曲刚度的影响,对带有一道加强层的框架-核心筒结构体系进行动力分析,得出了该结构体系前三阶自振频率与加强层位置的关系,并对考虑加强层弯曲刚度影响时核心筒剪切变形所引起振动频率的变化进行了分析。分析结果表明:设计时应选择设置“有限刚度”的加强层,适当增加与水平伸臂相连的外框柱轴向刚度,合理设置加强层的位置,核心筒剪切变形对带加强层高层建筑结构的自振频率影响可忽略不计。
关键词:框架-核心筒结构;振动特性;弯曲刚度;加强层位置;动力分析;剪切变形;
作者简介:王四清,学士,教授级高级工程师,一级注册结构工程师,主要从事新型复杂结构设计与研究,Email:AG5678@163.com。
基金:国家自然科学基金项目(50378035)。 -页码-:79-83
尊敬的用户,本篇文章需要2元,点击支付交费后阅读
参考文献[1] 高层建筑混凝土结构技术规程:JGJ 3—2010[S].北京:中国建筑工业出版社,2011.
[2] 沈蒲生,陈宇.带加强层的高层框架-变截面核心筒结构的自由振动分析[J].建筑科学与工程学报,2007,24(3):19-24.
[3] 陈宇,沈蒲生.带加强层高层结构考虑核心筒剪切变形影响的自由振动分析[J].工程抗震与加固改造,2007,29(5):25-29.
[4] 沈蒲生,陈宇,张明.带两道加强层变截面框架-核心筒的振动特性[J].湖南大学学报(自然科学版),2009,36(1):1-7.
[5] 熊军,刘彦青,赵喜庆.高层建筑水平加强层体系的自由振动分析[J].四川建筑科学研究,1998,24(1):22-24.
[6] 熊军,赵喜庆.高层建筑水平加强层体系考虑加强层弯曲影响的自由振动分析[J].四川建筑科学研究,2000,26(3):5-8.
[7] 沈蒲生.带加强层与错层高层结构设计与施工[M].北京:机械工业出版社,2009.
[8] R.克拉夫,J.彭津.结构动力学[M].北京:高等教育出版社,2006.
[9] CHOPRA A K.Dynamics of structures-theory and applications to earthquake engineering[M].Second Edition.Beijing:Tsinghua University Press,2005.
[10] 谭浩强,田淑清.FORTRAN语言 FORTRAN 77结构化程序设计[M].北京:清华大学出版社,1990.
Influence of outrigger bending stiffness on vibration characteristic of frame-core tube structure
WANG Siqing CHEN Yu SHEN Pusheng
(Hunan Architectural Design Institute Group Co., Ltd. New Complex Structure Research Center of Hunan Architectural Design Institute Group Co., Ltd. College of Civil Engineering,Hunan University)
Abstract: It is assumed that the axial stiffness of the outer frame column and the bending stiffness of the core tube are constant along the structural height, ignoring the influence of the moment of inertia. At the same time, it is considered that the horizontal outrigger is hinged with the outer frame column and rigidly connected with the core tube. Based on the vibration theory of the distributed parameter system, considering the influence of shear deformation of the core tube and bending stiffness of outrigger, the dynamic analysis of the frame-core tube structure system with an outrigger was carried out. The relationship between the first three natural frequencies of the structural system and the position of the strengthened layer was obtained. And the change of the vibration frequency caused by the shear deformation of the core tube when considering the bending stiffness of outrigger was analyzed. The results of analysis show that the design should choose to set the ‘finite stiffness' of outrigger, appropriately increase the axial stiffness of the outer frame column connected to the outrigger, and reasonably set outrigger position. The influence of the shear deformation of the core tube on the natural frequency of the high-rise building structure with the strengthening layer is negligible.
Keywords: frame-core tube structure; vibration characteristic; bending stiffness; outrigger position; dynamic analysis; shear deformation
543 0 0
文字:     A-     A+     默认 取消