發(fā)布時間：2019-07-08 14:08

【摘要】：隨著使用條件、材料性能和景觀要求的日益改善，人行橋向著大跨、輕柔、低阻尼方向發(fā)展。近年來，一些人行天橋發(fā)生了由行人激發(fā)的猛烈振動，嚴(yán)重影響了行走舒適性。人行橋振動問題日趨受到關(guān)注。目前，在進(jìn)行人行橋設(shè)計時，通常采用有限元法對天橋進(jìn)行舒適度評價，而本文主要針對簡化計算方法進(jìn)行了研究。本文在介紹了人行荷載以及人行橋人致振動理論的基礎(chǔ)上，以一座多跨連續(xù)梁橋?yàn)楸尘�，對減振措施以及添加減振裝置后結(jié)構(gòu)振動響應(yīng)的簡化計算進(jìn)行了研究，主要工作如下： (1)介紹了人行荷載模型和模態(tài)法的主要計算理論，并采用強(qiáng)迫振動理論分別對單人和人群過橋模型進(jìn)行振動分析。 (2)分別采用有限元法和單自由度共振理論計算天橋的振動響應(yīng)，對天橋進(jìn)行舒適度評估，設(shè)計相應(yīng)的TMD(調(diào)諧質(zhì)量阻尼器)參數(shù)，并分析其減振效果。 (3)對天橋振動響應(yīng)進(jìn)行分析時，振型函數(shù)的確定是比較重要的一步。本文提出用均布荷載作用下的撓曲線代替振型曲線參與計算，并確定了簡化計算和TMD設(shè)計中基本參數(shù)的取值；第2點(diǎn)中將單自由度結(jié)果與有限元結(jié)果進(jìn)行對比，可以證明振型函數(shù)的合理性，同時TMD的減振效果也可以證明其合理性。 (4)按照單自由度結(jié)構(gòu)-TMD系統(tǒng)計算模型來計算連續(xù)梁橋-TMD的各個振型的響應(yīng)。本文給出了兩種求解運(yùn)動方程的方法，較傳統(tǒng)解法簡單且容易理解；并在此基礎(chǔ)上分析了簡化計算和振動響應(yīng)的影響因素。 本文提出的振型函數(shù)及簡化計算方法能夠?yàn)檫B續(xù)梁橋初步的動力設(shè)計提供一定的參考，但是仍需要更多的工程實(shí)例來驗(yàn)證其準(zhǔn)確程度。
[Abstract]:With the increasing use condition, material performance and landscape requirements, the pedestrian bridge is developed in the direction of large span, soft and low damping. In recent years, some pedestrian bridges have been subjected to violent vibration by the pedestrian, which seriously affects the walking comfort. The problem of pedestrian bridge vibration is becoming more and more concerned. At present, in the design of a pedestrian bridge, a finite element method is usually used to evaluate the comfort of the bridge, and the method is mainly studied in this paper. Based on the introduction of the pedestrian load and the vibration theory of the pedestrian bridge, a multi-span continuous beam bridge is used as the background, and the simplified calculation of the vibration response of the structure after adding the vibration damping device is studied. The main work is as follows: (1) The main calculation theory of the pedestrian load model and the modal method is introduced, and the force vibration theory is used to separate the single person and the crowd bridge model respectively. (2) The vibration response of the bridge is calculated by using the finite element method and the single-degree-of-freedom resonance theory, and the comfort assessment of the bridge is carried out. The corresponding TMD (tuned mass damper) parameters are designed and analyzed. Vibration effect. (3) When the vibration response of the overbridge is analyzed, the determination of the mode shape function is the comparison In this paper, a flexible curve under the action of a uniform load is used instead of the mode shape curve to participate in the calculation, and the value of the basic parameters in the simplified calculation and the TMD design is determined. In the second point, the results of the single-degree of freedom are compared with the finite element results, and the mode shape function can be proved. The rationality of the number is reasonable, and the damping effect of the TMD can also be verified. and (4) calculating a continuous beam bridge-TMD according to a single-degree-of-freedom structure-TMD system calculation model, In this paper, two methods for solving the motion equation are given. The traditional solution is simple and easy to understand, and the simplified calculation and vibration are analyzed. The vibration mode function and the simplified calculation method presented in this paper can provide some reference for the initial dynamic design of the continuous beam bridge, but still require more engineering
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3

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本文編號：2511641