建筑物楼板人行振动舒适度研究

某工程楼板人行振动舒适度研究

Study on Floor Vibration Comfort

of a Project

学科专业：建筑与土木工程

研究生：吴超指

导教师：毕继红教授

企业导师：于朝晖高工

天津大学建筑工程学院二零

一二年十二月

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中文摘要

随着现代工程结构向大跨、轻、柔的方向发展，人活动引起结构的振动越来越显著，这种振动往往不足以为结构带来安全性问题，但是常常会给结构中的人带来不适感，出现紧张甚至恐慌心理，降低了工作，居住质量，影响了人们的正常生活，即所谓的舒适度问题。

本文基于某工程大跨楼板的背景，对楼板结构在人行荷载作用下的舒适度问题展开研究。首先提出了舒适度问题的概念，概述了国内外关于楼板振动舒适度的研究现状，详细介绍了本文所采用的国际标准中所使用的舒适度评价指标的计算方法，随后对本工程实例展开了有限元理论分析研究。理论研究采用数值模拟分析的手段考察该工程楼板在人行荷载作用下的竖向振动响应，通过大型通用有限元结构分析软件MIDAS/GEN 进行。首先建立楼板结构的有限元模型，根据人行荷载的特点确定楼板加载点，确定最不利的人行荷载工况，通过计算得到楼板的振动加速度时程，结合舒适度评价指标对楼板在人行荷载作用下的舒适度进行评价，分析结果表明本工程楼板结构的设计满足舒适度要求。

关键词：舒适度；舒适度评价；有限元分析

ABSTRACT

As modern engineering structures develop to the direction of large-span、light and soft, structural vibration caused by human activities behaves more and more significantly. Though the the vibration of structure is often insufficient to bring about security issues, but will often bring discomfort to people in the structure, even tensions and even panic, and then work efficiency will be reduced largely, the quality of living will be badly impacted, which affected the normal life of people, the so-called comfort issues.

Based on the background of long-span floors in a project, the study of floor structure behavior related to comfort index under foot load is carried out. In this article, the comfort issue is raised up firstly. And then an overview of the current situation of study on floor vibration comfort domestic and abroad is provided, the international standards used in the calculation method of evaluation index of comfort are described in details. Subsequently, a study of the project instance is launched on the theory of finite element. With the method of numerical simulation analysis, the theoretical study is performed to investigate the vertical vibration response of the floor subjected to foot loads of people. By Finite Element structural analysis software MIDAS/GEN, the finite element model of floor structure is set up firstly. According to the feature of this floor, the load points and detrimental footstep load case is determined. Through calculation process, floor vibration acceleration of the schedule is obtained. Under the evaluating indicator, the comfort level is evaluated and the result shows that the performance of floor structure meets the design specification of this project.

KEY WORDS：floor comfort; evaluation of comfort; finite-element analysis