基于环境振动的某设置防震缝结构的动力特性

发布时间：2018-01-05 23:32

本文关键词：基于环境振动的某设置防震缝结构的动力特性　出处：《湖南大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：对于设置防震缝的既有相邻结构,防震缝的塞缝和盖缝处理措施可能引起相邻结构间的动力相互作用,由此引起的模态会增加模态参数识别的复杂程度.以利用悬臂构件形成防震缝的某钢筋混凝土办公楼为例,该办公楼由主楼、东楼和西楼三部分组成,在各相邻结构内分别进行环境振动测试,利用频域分解法对其模态参数进行识别,得到了主楼和东楼的四阶及西楼的两阶自振频率、阻尼比和振型.由于各相邻结构间存在因防震缝的填缝措施引起的相互作用,导致一个结构的自振频率和由相互作用产生的频率混杂在一起.各结构有限元模型的自振频率和振型与识别结果吻合较好,但由于结构间的相互作用增强了整栋建筑的整体性,主楼和东楼的有限元模型的第三阶扭转频率均小于识别结果.对设置防震缝的相邻结构来说不应总是假定相互之间是独立的.
[Abstract]:For the existing adjacent structures with seismic joints, the treatment measures of the slug joints and the cover joints may cause the dynamic interaction between the adjacent structures. The modal caused by this will increase the complexity of modal parameter identification. Take a reinforced concrete office building with cantilever members as an example, the office building consists of three parts: main building, east building and west building. Environmental vibration test was carried out in each adjacent structure and the modal parameters were identified by frequency domain decomposition method. The fourth and second order natural frequencies of the main building and the east building and the west building were obtained. Damping ratio and mode shape. The interaction between adjacent structures is caused by the joint filling measures. The natural frequency and the frequency generated by the interaction are mixed together. The natural frequency and the vibration pattern of the finite element model are in good agreement with the recognition results. But because of the interaction between the structures, the whole building is enhanced. The third order torsional frequency of the finite element model of the main building and the east building is less than the result of identification. For adjacent structures with seismic joints, it should not always be assumed that each other is independent of each other.
【作者单位】：北京交通大学土木建筑工程学院;结构风工程与城市风环境北京市重点实验室;
【基金】：国家自然科学基金资助项目(51208030) 中央高校基本科研业务费(2014JBM100) 北京交通大学大学生创新性实验计划项目~~
【分类号】：TU311.3
【正文快照】： 对于体型复杂、平立面不规则的建筑,常在适当部位设置防震缝,形成多个较规则的抗侧力结构单元,设置了防震缝的相邻结构在既有建筑中广泛存在.历次地震的震害表明,防震缝处的碰撞破坏是结构常见的损伤形式[1-4].由于使用功能的要求,结构建成后一般需要对防震缝进行塞缝和盖缝处

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