基于自驱动机制双足模型的人致结构振动分析

发布时间：2018-06-22 23:56

本文选题：自驱动机制 + 社会力效应　；参考：《北京交通大学》2017年博士论文

【摘要】：行人活动引起结构超预期振动是关系到结构使用性与安全性的重要问题。当人的激励频率接近结构频率时,人为保持自身平衡使得步频趋于与结构频率保持一致,此时结构与人产生动力共振相互作用。振动测试表明人会影响结构的频率以及阻尼等动力性能参数。目前针对结构人致动力特性的主要前沿研究是将人简化为具有集中质量、刚度-阻尼腿的运动双足模型,用于分析人致结构动力特性。但该模型的稳定性反馈机制还并不成熟,行人对于自身能量的变化过于敏感使的该模型难于处理较为复杂的行走方式或人群问题。针对上述结构人致振动研究中存在的问题,本文从理论和数值两方面进行深入研究,具体内容如下:(1)提出基于自驱动机制的双足行人-结构竖向动力相互作用理论,该理论能够适应复杂的双足迈步行为和动态人群环境。通过利用集中质量-弹簧-阻尼腿双足模型,建立了行人-结构竖向相互作用系统的运动方程,研究了步行双足人体对结构动力响应和动力特性的影响并和已有研究结果进行了比较。并对人体的质量、人腿刚度和阻尼以及步频等人体参数变化对结构动力特性的影响进行了分析。(2)基于社会力模型研究了运动双足人群对结构竖向动力响应以及动力特性的影响,同时研究了人群密度变化对结构动力响应和动力特性的影响。并基于人群均匀分布和同步运动假设提出了人群作用下结构动力特性的解析解,研究了人群规模变化对结构竖向动力响应以及动力特性的影响。(3)提出了基于自驱动机制的双足人致结构侧向运动理论。通过利用生物力学双足模型,建立了行人-结构系统的运动方程,研究了双足运动人体对结构侧向动力响应和动力特性的影响。并对人体的质量、人腿刚度和阻尼以及步频等人体参数变化对结构侧向响应和动力特性的影响进行了分析。(4)基于社会力模型研究了运动双足人群对结构侧向动力响应以及动力特性的影响,同时研究了行人数量变化对结构侧向动力响应和动力特性的影响。并基于人群均匀分布和同步运动假设提出了人群作用下结构侧向动力特性的解析解,研究了人群规模变化对结构侧向动力响应以及动力特性的影响,其对于解决工程实际问题具有参考意义。(5)基于行人自驱动机制提出了三维双足行人-结构动力相互作用理论,研究了步行过程中结构的侧向和竖向动力响应以及动力特性变化,并研究了步行过程中行人的空间三维动力响应。
[Abstract]:Super-expected vibration caused by pedestrian movement is an important problem related to the structural usability and safety. When the excitation frequency of human is close to the structural frequency, the step frequency tends to be consistent with the structural frequency, and the dynamic resonance between the structure and the human is produced. The vibration test shows that the frequency and damping of the structure will be affected by man. At present, the main research on the dynamic characteristics of structures is to simplify human beings as a biped motion model with concentrated mass, stiffness and damping legs, which is used to analyze the dynamic characteristics of human-induced structures. However, the stability feedback mechanism of the model is not yet mature, and the pedestrian is too sensitive to the change of their own energy to deal with more complex walking patterns or crowd problems. In view of the problems existing in the study of the structure induced vibration, this paper makes a deep study from the theoretical and numerical aspects. The main contents are as follows: (1) the theory of biped pedestrian / structure vertical dynamic interaction based on self-driving mechanism is proposed. This theory can adapt to complex biped walking behavior and dynamic crowd environment. The equations of motion of the pedestrian structure vertical interaction system are established by using the two-legged model of lumped mass-spring-damping leg. The effect of walking biped human body on the dynamic response and dynamic characteristics of the structure is studied and compared with the existing results. The effects of human body mass, leg stiffness and damping, and step frequency on the dynamic characteristics of the structure are analyzed. (2) based on the social force model, the vertical dynamic response and dynamic characteristics of the structure are studied. At the same time, the influence of population density on the dynamic response and dynamic characteristics of the structure is studied. Based on the assumption of uniform population distribution and synchronous motion, an analytical solution for the dynamic characteristics of the structure under the action of a crowd is proposed. The effect of population size on the vertical dynamic response and dynamic characteristics of structures is studied. (3) the theory of biped human-induced lateral motion based on self-driving mechanism is proposed. By using bipedal biomechanical model, the equations of motion of pedestrian structure system are established, and the influence of biped human body on the lateral dynamic response and dynamic characteristics of the structure is studied. And the quality of the human body, The effects of human body parameters such as leg stiffness, damping and step frequency on the lateral response and dynamic characteristics of the structure are analyzed. (4) based on the social force model, the effects of bipedal motion on the lateral dynamic response and dynamic characteristics of the structure are studied. At the same time, the influence of pedestrian number on the lateral dynamic response and dynamic characteristics of the structure is studied. Based on the assumption of uniform population distribution and synchronous movement, the analytical solution of lateral dynamic characteristics of structure under the action of crowd is proposed, and the influence of crowd size on the lateral dynamic response and dynamic characteristics of the structure is studied. It has reference significance for solving practical engineering problems. (5) based on the pedestrian self-driving mechanism, a three-dimensional theory of the dynamic interaction between biped pedestrian and structure is proposed, and the lateral and vertical dynamic responses and dynamic characteristics of the structure are studied in the course of walking. The three-dimensional dynamic response of pedestrian during walking is studied.
【学位授予单位】：北京交通大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TU311.3

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