本文選題：自驅(qū)動機制 + 社會力效應(yīng)�。� 參考：《北京交通大學(xué)》2017年博士論文

【摘要】：行人活動引起結(jié)構(gòu)超預(yù)期振動是關(guān)系到結(jié)構(gòu)使用性與安全性的重要問題。當(dāng)人的激勵頻率接近結(jié)構(gòu)頻率時,人為保持自身平衡使得步頻趨于與結(jié)構(gòu)頻率保持一致,此時結(jié)構(gòu)與人產(chǎn)生動力共振相互作用。振動測試表明人會影響結(jié)構(gòu)的頻率以及阻尼等動力性能參數(shù)。目前針對結(jié)構(gòu)人致動力特性的主要前沿研究是將人簡化為具有集中質(zhì)量、剛度-阻尼腿的運動雙足模型,用于分析人致結(jié)構(gòu)動力特性。但該模型的穩(wěn)定性反饋機制還并不成熟,行人對于自身能量的變化過于敏感使的該模型難于處理較為復(fù)雜的行走方式或人群問題。針對上述結(jié)構(gòu)人致振動研究中存在的問題,本文從理論和數(shù)值兩方面進行深入研究,具體內(nèi)容如下:(1)提出基于自驅(qū)動機制的雙足行人-結(jié)構(gòu)豎向動力相互作用理論,該理論能夠適應(yīng)復(fù)雜的雙足邁步行為和動態(tài)人群環(huán)境。通過利用集中質(zhì)量-彈簧-阻尼腿雙足模型,建立了行人-結(jié)構(gòu)豎向相互作用系統(tǒng)的運動方程,研究了步行雙足人體對結(jié)構(gòu)動力響應(yīng)和動力特性的影響并和已有研究結(jié)果進行了比較。并對人體的質(zhì)量、人腿剛度和阻尼以及步頻等人體參數(shù)變化對結(jié)構(gòu)動力特性的影響進行了分析。(2)基于社會力模型研究了運動雙足人群對結(jié)構(gòu)豎向動力響應(yīng)以及動力特性的影響,同時研究了人群密度變化對結(jié)構(gòu)動力響應(yīng)和動力特性的影響。并基于人群均勻分布和同步運動假設(shè)提出了人群作用下結(jié)構(gòu)動力特性的解析解,研究了人群規(guī)模變化對結(jié)構(gòu)豎向動力響應(yīng)以及動力特性的影響。(3)提出了基于自驅(qū)動機制的雙足人致結(jié)構(gòu)側(cè)向運動理論。通過利用生物力學(xué)雙足模型,建立了行人-結(jié)構(gòu)系統(tǒng)的運動方程,研究了雙足運動人體對結(jié)構(gòu)側(cè)向動力響應(yīng)和動力特性的影響。并對人體的質(zhì)量、人腿剛度和阻尼以及步頻等人體參數(shù)變化對結(jié)構(gòu)側(cè)向響應(yīng)和動力特性的影響進行了分析。(4)基于社會力模型研究了運動雙足人群對結(jié)構(gòu)側(cè)向動力響應(yīng)以及動力特性的影響,同時研究了行人數(shù)量變化對結(jié)構(gòu)側(cè)向動力響應(yīng)和動力特性的影響。并基于人群均勻分布和同步運動假設(shè)提出了人群作用下結(jié)構(gòu)側(cè)向動力特性的解析解,研究了人群規(guī)模變化對結(jié)構(gòu)側(cè)向動力響應(yīng)以及動力特性的影響,其對于解決工程實際問題具有參考意義。(5)基于行人自驅(qū)動機制提出了三維雙足行人-結(jié)構(gòu)動力相互作用理論,研究了步行過程中結(jié)構(gòu)的側(cè)向和豎向動力響應(yīng)以及動力特性變化,并研究了步行過程中行人的空間三維動力響應(yīng)。
[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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TU311.3

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