为研究调谐质量阻尼器(tuned mass damper,简称TMD)在控制轨道箱梁结构振动中的应用,以高速动车组和CRTS-Ⅱ型板式无砟轨道-箱梁结构为原型,设计制作了几何相似比为10∶1的车-轨-桥耦合振动缩尺模型系统,分析了TMD在不同质量比、不同位...为研究调谐质量阻尼器(tuned mass damper,简称TMD)在控制轨道箱梁结构振动中的应用,以高速动车组和CRTS-Ⅱ型板式无砟轨道-箱梁结构为原型,设计制作了几何相似比为10∶1的车-轨-桥耦合振动缩尺模型系统,分析了TMD在不同质量比、不同位置以及不同安装数量等工况下对箱梁顶板和翼板的减振效果。结果表明:TMD质量比为0.02时减振效果优于质量比为0.01时的减振效果,在考虑结构安全及经济性的条件下,可优先选择质量比更大的TMD;不同TMD安装位置对箱梁各部件的减振效果不同,安装TMD的板件处振动响应得到了明显抑制;安装2个TMD对箱梁结构的减振效果优于安装1个TMD,其减振范围也有所提升。研究结论可为高架轨道箱梁结构的减振设计提供参考。展开更多
Earthquake is a kind of sudden and destructive random excitation in nature.It is significant to determine the probability distribution characteristics of the corresponding dynamic indicators to ensure the safety and t...Earthquake is a kind of sudden and destructive random excitation in nature.It is significant to determine the probability distribution characteristics of the corresponding dynamic indicators to ensure the safety and the stability of structures when the intensive seismic excitation,the intensity of which is larger than 7,acts in train-bridge system.Firstly,the motion equations of a two-dimensional train-bridge system under the vertical random excitation of track irregularity and the vertical seismic acceleration are established,where the train subsystem is composed of 8 mutually independent vehicle elements with 48 degrees of freedom,while the single-span simple supported bridge subsystem is composed of 102D beam elements with 20 degrees of freedom on beam and 2 large mass degrees of freedom at the support.Secondly,Monte Carlo method and pseudo excitation method are adopted to analyze the statistical parameters of the system.The power spectrum density of random excitation is used to define a series of non-stationary pseudo excitation in pseudo excitation method and the trigonometric series of random vibration history samples in Monte Carlo method,respectively solved by precise integral method and Newmark-βmethod through the inter-system iterative procedure.Finally,the results are compared with the case under the weak seismic excitation,and show that the samples of vertical acceleration response of bridge and the offload factor of train obeys the normal distribution.In a high probability,the intensive earthquakes pose a greater threat to the safety and stability of bridges and trains than the weak ones.展开更多
文摘为研究调谐质量阻尼器(tuned mass damper,简称TMD)在控制轨道箱梁结构振动中的应用,以高速动车组和CRTS-Ⅱ型板式无砟轨道-箱梁结构为原型,设计制作了几何相似比为10∶1的车-轨-桥耦合振动缩尺模型系统,分析了TMD在不同质量比、不同位置以及不同安装数量等工况下对箱梁顶板和翼板的减振效果。结果表明:TMD质量比为0.02时减振效果优于质量比为0.01时的减振效果,在考虑结构安全及经济性的条件下,可优先选择质量比更大的TMD;不同TMD安装位置对箱梁各部件的减振效果不同,安装TMD的板件处振动响应得到了明显抑制;安装2个TMD对箱梁结构的减振效果优于安装1个TMD,其减振范围也有所提升。研究结论可为高架轨道箱梁结构的减振设计提供参考。
基金Project(52178101) supported by the National Natural Science Foundation of China。
文摘Earthquake is a kind of sudden and destructive random excitation in nature.It is significant to determine the probability distribution characteristics of the corresponding dynamic indicators to ensure the safety and the stability of structures when the intensive seismic excitation,the intensity of which is larger than 7,acts in train-bridge system.Firstly,the motion equations of a two-dimensional train-bridge system under the vertical random excitation of track irregularity and the vertical seismic acceleration are established,where the train subsystem is composed of 8 mutually independent vehicle elements with 48 degrees of freedom,while the single-span simple supported bridge subsystem is composed of 102D beam elements with 20 degrees of freedom on beam and 2 large mass degrees of freedom at the support.Secondly,Monte Carlo method and pseudo excitation method are adopted to analyze the statistical parameters of the system.The power spectrum density of random excitation is used to define a series of non-stationary pseudo excitation in pseudo excitation method and the trigonometric series of random vibration history samples in Monte Carlo method,respectively solved by precise integral method and Newmark-βmethod through the inter-system iterative procedure.Finally,the results are compared with the case under the weak seismic excitation,and show that the samples of vertical acceleration response of bridge and the offload factor of train obeys the normal distribution.In a high probability,the intensive earthquakes pose a greater threat to the safety and stability of bridges and trains than the weak ones.
