本文選題：振動(dòng)舒適度 + 人行激勵(lì)��； 參考：《昆明理工大學(xué)》2014年碩士論文

【摘要】：近年來(lái),隨著結(jié)構(gòu)向輕質(zhì)、大跨度、纖柔方向發(fā)展,越來(lái)越多的工程由于振動(dòng)舒適度問(wèn)題導(dǎo)致其難以正常使用,部分建筑進(jìn)行了重新加固或改造甚至完全拆除。由此可見(jiàn),一旦建筑結(jié)構(gòu)出現(xiàn)了振動(dòng)舒適度問(wèn)題,解決的難度和代價(jià)將會(huì)很大,因此對(duì)建筑結(jié)構(gòu)的振動(dòng)舒適度進(jìn)行研究是必不可少的。本文結(jié)合結(jié)構(gòu)動(dòng)力學(xué)、人機(jī)工程學(xué)和概率論對(duì)人行激勵(lì)下樓板和人行天橋的振動(dòng)問(wèn)題進(jìn)行了系統(tǒng)研究。 首先,本文介紹了有關(guān)樓板和人行天橋振動(dòng)舒適度的設(shè)計(jì)標(biāo)準(zhǔn)和評(píng)價(jià)方法。然后通過(guò)由均勻試驗(yàn)設(shè)計(jì)法確定的30條人行荷載根據(jù)Ellingwood方法構(gòu)造激勵(lì)函數(shù),結(jié)合newmark算法對(duì)單人作用下的樓板結(jié)構(gòu)和人行天橋分別進(jìn)行了大量的計(jì)算。給出了樓板結(jié)構(gòu)在單人移動(dòng)荷載下的豎向最大加速度響應(yīng)譜和均方根加速度響應(yīng)譜,人行天橋在人-橋相互作用下的側(cè)向最大加速度響應(yīng)譜和均方根加速度響應(yīng)譜。分析了響應(yīng)譜對(duì)結(jié)構(gòu)的跨度、邊界條件、阻尼比等因素的敏感性后,給出了兩種結(jié)構(gòu)的參考響應(yīng)譜和跨度、阻尼比修正系數(shù),回歸了參考響應(yīng)譜包絡(luò)線的方程,進(jìn)一步給出了單人行走下樓板和人行天橋動(dòng)力響應(yīng)的簡(jiǎn)化計(jì)算方法,通過(guò)計(jì)算出的響應(yīng)對(duì)結(jié)構(gòu)進(jìn)行舒適性驗(yàn)算。 單人作用引起的結(jié)構(gòu)振動(dòng)問(wèn)題的研究相對(duì)成熟,人群作用下結(jié)構(gòu)的振動(dòng)研究逐漸成為目前研究的重點(diǎn)。本文采用蒙特卡羅模擬技術(shù)解決了人群作用下樓板的豎向振動(dòng)和人行天橋的側(cè)向振動(dòng)問(wèn)題,主要包含以下兩部分： (1)對(duì)樓板結(jié)構(gòu)在不同人群密度下分別進(jìn)行20000次蒙特卡羅模擬,得到了樓板結(jié)構(gòu)的最大加速度和均方根加速度的均值、標(biāo)準(zhǔn)差、75%分位值和95%分位值,回歸了動(dòng)力響應(yīng)的增大倍數(shù)與人數(shù)之間的表達(dá)式。改變樓板的跨度比和邊界條件在相同的人群密度下分別進(jìn)行20000次模擬,得到人群作用下樓板結(jié)構(gòu)在不同跨度比下的邊界條件修正系數(shù)。根據(jù)以上研究,通過(guò)簡(jiǎn)單的計(jì)算就可以求得結(jié)構(gòu)相應(yīng)的加速度響應(yīng),從而進(jìn)行舒適度評(píng)價(jià) (2)考慮人-橋相互作用下人行天橋的側(cè)向振動(dòng)。通過(guò)引入附加側(cè)向行人作用,建立了人-橋動(dòng)力耦合模型,在結(jié)構(gòu)側(cè)向失穩(wěn)的臨界人數(shù)范圍內(nèi)對(duì)不同的人群密度分別進(jìn)行20000次蒙特卡羅模擬計(jì)算,得出了振動(dòng)響應(yīng)的增大隨人數(shù)增長(zhǎng)的函數(shù)關(guān)系。比較分析了考慮人-橋相互作用和不考慮人-橋相互作用時(shí)橋梁的動(dòng)力響應(yīng),結(jié)果表明當(dāng)人數(shù)超過(guò)20時(shí),人-橋相互作用對(duì)振動(dòng)的影響是不容忽略的。進(jìn)一步總結(jié)了不同人數(shù)的情況下結(jié)構(gòu)振動(dòng)響應(yīng)的計(jì)算方法,該方法可以為人群作用下人行天橋側(cè)向振動(dòng)舒適度的評(píng)價(jià)提供參考依據(jù)。 論文通過(guò)反應(yīng)譜法和蒙特卡羅模擬技術(shù)研究了大跨度樓板結(jié)構(gòu)和人行天橋在人行激勵(lì)下的振動(dòng)舒適度問(wèn)題,并給出了兩種結(jié)構(gòu)舒適度評(píng)價(jià)的一般方法,本方法理論上合理并且簡(jiǎn)便實(shí)用,具有良好的工程意義。 本論文屬于國(guó)家自然科學(xué)基金項(xiàng)目(編號(hào)：51168021)的組成部分。
[Abstract]:In recent years, with the development of structure to light, long span, and flexible direction, more and more projects are difficult to use due to the vibration comfort problem. Some buildings are reformed or rebuilt or even completely demolished. Thus, it can be seen that once the structure of the structure has a vibration comfort, the difficulty and cost will be greatly solved. Therefore, it is necessary to study the vibration comfort of the building structure. In this paper, the vibration of the floor and pedestrian bridge under human excitation is systematically studied in the light of structural dynamics, ergonomics and probability theory.
First, the design standards and evaluation methods of floor and pedestrian bridge vibration comfort are introduced in this paper. Then 30 human loads determined by the uniform test design method are used to construct the excitation function according to the Ellingwood method, and a large amount of calculation is given to the floor structure and the pedestrian bridge under single person by the Newmark algorithm. The vertical maximum acceleration response spectrum and the root mean square acceleration response spectrum of the floor structure under single moving load are given. The lateral maximum acceleration response spectrum and the root mean square acceleration response spectrum of the pedestrian bridge under the interaction of man and bridge are given. The response spectrum is given to analyze the sensitivity of the response spectrum to the structure's span, boundary condition, damping ratio and so on. The reference response spectrum and span of the two structures, the damping ratio correction coefficient and the equation of the reference response spectrum envelope are regress, and the simplified calculation method of the dynamic response of the single man walking floor and the pedestrian bridge is further given, and the structure is calculated by the calculated response.
The study of structural vibration caused by single action is relatively mature, and the research of vibration of structure under the action of crowds has gradually become the focus of research. This paper uses Monte Carlo simulation technology to solve the vertical vibration of the floor and the lateral vibration of the pedestrian bridge under the action of the crowd, which mainly includes the following two parts:
(1) 20000 times Monte Carlo simulation is carried out on the floor structure under the density of different population. The maximum acceleration and mean square root acceleration of the floor structure, the standard deviation, the 75% division value and the 95% division value are obtained, and the expression between the increasing multiplier and the number of the dynamic response is returned. The span ratio of the floor and the boundary condition are changed in phase. 20000 simulations are carried out in the same population density, and the boundary condition correction coefficient of the floor structure under the different span ratio is obtained. According to the above study, the corresponding acceleration response can be obtained by simple calculation, thus the comfort degree is evaluated.
(2) considering the lateral vibration of a pedestrian bridge under the interaction of man and bridge. By introducing an additional lateral pedestrian action, a dynamic coupling model of a man bridge is established. In the range of the critical number of the lateral instability of the structure, 20000 Monte Carlo simulations are carried out to the density of the different population respectively, and the function of the vibration response increases with the increase of the number of people. The relationship between the bridge interaction and the bridge interaction is compared and analyzed. The results show that the influence of the bridge interaction on the vibration is not negligible when the number of people is over 20. The calculation method of the structural vibration response is further summed up in the case of different number of people. This method can be used for the crowd. The reference for the evaluation of lateral vibration comfort of the footbridge is provided.
In this paper, the problem of vibration comfort of large span floor structure and pedestrian bridge under human excitation is studied by the reaction spectrum method and Monte Carlo simulation technique, and two general methods for evaluating the comfort degree of the structure are given. This method is reasonable in theory, simple and practical, and has good engineering significance.
This thesis is part of the National Natural Science Foundation of China (serial number: 51168021).
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.11;U441.3

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本文編號(hào)：2117606