天津马球场天桥-TMD减振及简化算法研究
发布时间：2019-07-08 14:08
【摘要】：随着使用条件、材料性能和景观要求的日益改善，人行桥向着大跨、轻柔、低阻尼方向发展。近年来，一些人行天桥发生了由行人激发的猛烈振动，严重影响了行走舒适性。人行桥振动问题日趋受到关注。目前，在进行人行桥设计时，通常采用有限元法对天桥进行舒适度评价，而本文主要针对简化计算方法进行了研究。本文在介绍了人行荷载以及人行桥人致振动理论的基础上，以一座多跨连续梁桥为背景，对减振措施以及添加减振装置后结构振动响应的简化计算进行了研究，主要工作如下： (1)介绍了人行荷载模型和模态法的主要计算理论，并采用强迫振动理论分别对单人和人群过桥模型进行振动分析。 (2)分别采用有限元法和单自由度共振理论计算天桥的振动响应，对天桥进行舒适度评估，设计相应的TMD(调谐质量阻尼器)参数，并分析其减振效果。 (3)对天桥振动响应进行分析时，振型函数的确定是比较重要的一步。本文提出用均布荷载作用下的挠曲线代替振型曲线参与计算，并确定了简化计算和TMD设计中基本参数的取值；第2点中将单自由度结果与有限元结果进行对比，可以证明振型函数的合理性，同时TMD的减振效果也可以证明其合理性。 (4)按照单自由度结构-TMD系统计算模型来计算连续梁桥-TMD的各个振型的响应。本文给出了两种求解运动方程的方法，较传统解法简单且容易理解；并在此基础上分析了简化计算和振动响应的影响因素。 本文提出的振型函数及简化计算方法能够为连续梁桥初步的动力设计提供一定的参考，但是仍需要更多的工程实例来验证其准确程度。
[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
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
本文编号：2511641
[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
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
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