组合管桁架楼盖的人致振动舒适度研究

发布时间：2018-01-06 13:04

本文关键词：组合管桁架楼盖的人致振动舒适度研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国经济发展和科技水平的不断提高，越来越多造型优美、结构新颖的多层大跨空间结构得到了迅猛的发展。多层的大跨空间结构楼盖设计既要满足大跨度的要求，还要做到轻质高强，而钢-混凝土组合楼盖具有这方面的优越性，从而得到了广泛应用。目前我国针对组合管桁架这种新型组合楼盖的研究甚少，这些大跨结构在人行走、跑步等正常活动下，很容易被激发振动甚至共振，引起人的不舒适感，，甚至恐慌感。因此，本文以新型的组合管桁架楼盖结构为研究对象，开展了基于人体振动舒适度的结构人致振动响应及结构振动舒适度影响因素的分析。本文在查阅了国内外相关文献的基础上，选取傅里叶级数人行荷载模型，并确立了相应的振动舒适度评价标准，通过SAP2000有限元软件建立组合管桁架楼盖结构的分析模型，由于该组合楼盖整体竖向偏柔，振型分布比较密集，振动基频处在人正常活动的步频范围内，人行走激励下很容易产生共振；较单人作用而言，人群作用下结构的振动响应要更剧烈，人群数和结构的响应加速度峰值之间满足指数函数关系。本文研究中主要分析了楼板的长宽比、桁架高跨比、混凝土板厚以及建筑功能这些参数对振动舒适度的影响：楼板长宽比变大时，结构的自振频率逐渐减小，这一变化规律可以用指数函数关系式进行描述；桁架高度变化对结构的刚度影响较大，结构自振频率随着桁架高度的增大而大幅提高，而且振动响应也随之减小，在结构的振动舒适度设计中改变桁架高度具有更明显的经济效益；楼板上的活荷载作为结构质量源的一部分，其取值会直接影响结构的动力特性，根据建筑功能合理选取活荷载大小对结构的振动舒适度设计也至关重要。
[Abstract]:With the development of China's economy and the continuous improvement of science and technology, more and more beautiful, the space structure of novel multilayer structure of large span has been developed rapidly. Large span space structure design of multi floor should not only meet the demand of big span, but also be lightweight, and steel concrete composite slab has the superiority in this area thus, a wide range of applications. At present our country to study this new type of composite tube truss composite floor is very little, the large span structure in walking, running and other normal activities, it is easy to be excited and even cause resonance, the people feel uncomfortable, and even panic. Therefore, on the basis of the composite tube truss floor structure as the research object, carried out based on the structure of human body vibration comfort caused by vibration vibration response and structure analysis of the factors affect comfort.
This paper bases on the related literature at home and abroad, selection of Fourier series pedestrian load model, and established the corresponding vibration comfort evaluation criteria, establish the analysis model of composite tube truss floor structure by SAP2000 finite element software, due to the combination of floor vertical vibration type soft, dense distribution, vibration frequency at the normal activity frequency range, walking excitation is prone to resonance; a single function, response to more severe structural vibration under the action of the crowd, the relationship of exponential function between the peak acceleration and the number of population structure.
This paper mainly analyzes the floor length to width ratio, truss height span ratio, the effect of concrete slab thickness and building function of these parameters on the vibration comfort degree: floor length to width ratio becomes larger, the self vibration frequency decreases structure, this variation can be used to describe the relationship of exponential function; stiffness the truss height change on the structure of the larger, the natural frequency of the structure with truss height increases greatly, and the vibration response also decreases, the structure vibration comfort design changes in the truss height has more obvious economic benefit; on the floor live load as part of a structural quality source, its value will be directly effect of the dynamic characteristics of the structure, according to the building function selection of live load size on structure vibration comfort design is also crucial reasonable.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU311.3

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