楼板尺寸对振动舒适度影响的分析
发布时间:2019-05-28 11:40
【摘要】:由于对新的结构材料、施工方法、结构体系,现代建(构)筑物变得更轻、更柔、跨度更大,这些建(构)筑物结构在机械和人的活动的作用下易产生比较明显的振动响应。会给建(构)筑物结构中的居住者带来不舒服感,降低了工作生活环境质量,引起振动舒适度问题。本文主要针对楼板尺寸大小对楼板振动舒适度影响的研究:根据人对振动的舒适度评价,人行踏步频率范围为1~2.8Hz,作用在楼板中心处,分析在不同楼板尺寸参数变化下的振动舒适度。对单跨楼板分析长宽比、厚度这两个尺寸因素,以及多跨楼板中跨数这一因素。在有限元模型分析中讨论这三个因素得到基频,并把得到的结果导入到MATLAB中计算得到加速度受迫响应,总结出每个因素下相应的响应趋势。单跨楼板中,楼板的基频是结构的固有特性,随着楼板宽度W的增加楼板的基率减小,楼板模态质量增加;大面积楼板和较长跨度的楼板基频都较低。单跨楼板中楼板宽度W不变,长度变化,长宽比为1时楼板计权加速度最大,楼板平面面积越大踏步荷载作用产生的加速度越大。增加楼板的厚度会增大楼板的基频和模态质量,楼板基率与楼板厚度成正相关变化,厚度的增加楼板计权加速度减小。对多跨楼板中,楼板跨数增加基率和加速度增加,增加到3×3跨后楼板加速度和基频变化非常小;楼板长宽比小产生的楼板速度和加速度响应小;楼板厚度增加楼板基频几乎成线性增加,低频楼板加速度逐渐减小,高频楼板速度增加,跨数增加到5×5高频楼板速度变化非常小后趋于稳定。当踏步频率范围在1~2.8Hz内的单个人行荷载作用下,单跨和多跨楼板中改变楼板长宽比和厚度,楼板基频和响应加速度发生明显变化,但不会改变楼板振动舒适度的范围等级;多跨楼板中,楼板跨数增加响应加速度会增加到一个值域就不会发生明显改变,亦不会改变楼板振动舒适度的范围等级。
[Abstract]:Because of the new structural materials, construction methods, structural systems, modern buildings (structures) become lighter, softer and longer span, these structures are easy to produce obvious vibration response under the action of mechanical and human activities. It will bring discomfort to the occupants of the building structure, reduce the quality of working and living environment, and cause the problem of vibration comfort. In this paper, the influence of floor size on floor vibration comfort is studied: according to the human comfort evaluation of vibration, the pedestrian stepping frequency range is 1 鈮,
本文编号:2487016
[Abstract]:Because of the new structural materials, construction methods, structural systems, modern buildings (structures) become lighter, softer and longer span, these structures are easy to produce obvious vibration response under the action of mechanical and human activities. It will bring discomfort to the occupants of the building structure, reduce the quality of working and living environment, and cause the problem of vibration comfort. In this paper, the influence of floor size on floor vibration comfort is studied: according to the human comfort evaluation of vibration, the pedestrian stepping frequency range is 1 鈮,
本文编号:2487016
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