大跨度楼板体系振动舒适度研究

发布时间：2018-09-18 17:42

【摘要】：随着轻质和高强材料的广泛运用、设计方法的不断进步,施工技术的日趋成熟,大跨度楼板体系在公共建筑及住宅建筑中得到了广泛的应用,这使得现代建筑的楼板结构跨度越来越大,刚度越来越小。由于跨度的增加以及隔墙等非结构构件的减少,使得大跨度楼盖的阻尼减小,基频降低。人行天桥,大型舞厅、展览馆、健身房等人类活动集中的场所,在人行荷载或有节奏运动的作用下容易产生竖向振动,超过一定限度就会出现振动舒适度问题,引起人们的不安和恐慌。本文以三个工程案例为背景,对大跨度楼板结构的振动舒适度问题作了以下研究:(1)针对大跨度楼板振动舒适度问题,对重要的振动舒适度评价标准和国内外重要的规范做了简要介绍,比较了不同标准的优点和缺点,选定了适合本文的评价标准,为舒适度的评价提供了理论背景。(2)采用傅里叶级数法,推导了人行荷载前15阶谐分量作用下楼板结构竖向振动峰值加速度的计算公式。以交叉路口的人行天桥为工程案例,使用人行荷载前15阶谐分量共同作用的方法和现行规范提供的方法分别计算人行天桥的峰值加速度,将两种计算方法的结果进行了比较,得到了更适合楼板振动舒适度设计的加速度计算方法,为振动舒适度的计算提出了建议。(3)对某健身房楼盖进行了舒适度分析,对大跨度楼盖在有节奏运动下的振动进行了理论计算。对不满足振动舒适度要求的楼板,分析了原因,并提出了三种加固方案,将三种加固方案进行了对比分析,提出了可以实现的方法来改善楼板的舒适度,使结构满足舒适度要求,为结构设计和加固提供了参考。(4)对某五星级酒店项目中主楼与裙房之间的连廊进行了振动舒适度分析。采用大型通用有限元软件ANSYS进行了有限元模拟计算,对在慢速行走、正常行走、快速行走、慢速跑步、快速跑步以及跳跃等各种荷载作用下的连廊进行了模态分析以及动力时程分析,对不满足振动舒适度要求的连廊采用设置调谐质量阻尼器(TMD)以及6种增大梁截面尺寸的方法分别进行加固,将各种加固方法进行了对比,得到最有效的加固减振方案,为振动舒适度设计和结构加固提供了参考。
[Abstract]:With the extensive use of lightweight and high-strength materials, the continuous progress of design methods and the maturation of construction technology, the long-span floor system has been widely used in public buildings and residential buildings. This makes the floor structure of modern buildings more and more span, stiffness is becoming smaller and smaller. Because of the increase of span and the decrease of non-structural members such as partition wall, the damping of long span floor decreases and the frequency of foundation decreases. Pedestrian overpasses, large dance halls, exhibition halls, gymnasiums, and other places where human activities are concentrated tend to produce vertical vibrations under the action of pedestrian loads or rhythmic movements, and if they exceed a certain limit, there will be problems of vibration comfort. Cause people's unease and panic. In this paper, based on three engineering cases, the vibration comfort of long-span floor structure is studied as follows: (1) aiming at the problem of vibration comfort of long-span floor structure, This paper briefly introduces the important evaluation standards of vibration comfort degree and the important norms at home and abroad, compares the advantages and disadvantages of different standards, and selects the evaluation standards suitable for this paper. It provides a theoretical background for the evaluation of comfort degree. (2) the formula for calculating the peak acceleration of vertical vibration of floor structure under the action of 15 harmonic components before walking load is derived by Fourier series method. Taking the pedestrian overpass at the intersection as an engineering case, the peak acceleration of the footbridge is calculated by using the method of the common action of the 15 harmonic components before the pedestrian load and the method provided by the current code, and the results of the two calculation methods are compared. The acceleration calculation method which is more suitable for the design of floor vibration comfort is obtained, and some suggestions for the calculation of vibration comfort are put forward. (3) the comfort degree of a gymnasium floor is analyzed. The vibration of long span floor under rhythmic motion is calculated theoretically. This paper analyzes the reasons for the floor slab which does not meet the requirements of vibration comfort, and puts forward three reinforcement schemes. The comparison and analysis of the three reinforcement schemes are carried out, and the methods that can be realized to improve the comfort degree of the floor slab are put forward. It makes the structure meet the requirements of comfort and provides a reference for structural design and reinforcement. (4) the vibration comfort analysis of the corridor between the main building and the skirt in a five-star hotel project is carried out. The finite element simulation calculation was carried out by using the large and universal finite element software ANSYS, which was used in slow walking, normal walking, fast walking and slow running. Modal analysis and dynamic time history analysis are carried out on the corridors under various loads, such as fast running and jumping. For the corridor which does not meet the requirements of vibration comfort, the tuned mass damper (TMD) and six methods to increase the section size of the beam are used to reinforce the verandah. The comparison of various reinforcement methods is carried out, and the most effective reinforcement and damping scheme is obtained. It provides reference for vibration comfort design and structural reinforcement.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU311.3

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