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Dynamic Evaluations of Safety of Secondary Structures of Bridge Structures

桥梁结构二级结构安全动态评价

基本信息

批准号：
18560476
负责人：
IIDA Takeshi
金额：
$ 2.43万
依托单位：
Osaka Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560476/
关键词：
Dynamic response of secondary structures of bridge Traffic load Vibration of bridge structure Dynamic evaluation of safety Deconvolutional analysis 疲労安全性振動抑圧工法

项目摘要

Secondary structure on bridges play an important role on traffic safety. In order to design secondary structure on bridge, the vibration of the bridge should be taken into account as a design loading for the secondary structures. It is important for the available design of the secondary structure to assess the dynamic response of the bridge due to time varying traffic loading. The 3-dimensional FEM model was used to evaluate the vibration response of highway bridge with survey data and was carried out the stress evaluation occurred on a secondary structure. Moreover, the vibration controlling method was examined with the method of using together chain damper and damper with granular materials etc..The results of analyses and tests are summarized as follows.(1) The deconvolutional analysis by using the vibration measurement of bridge by traffic load was carried out to assess the bridge structure vibration due to traffic, and the consequent dynamic response characteristics of secondary structure. It is demonstrated that the bridge structure vibration can be evaluated with sufficient accuracy by this analysis.(2) It is shown that it is possible to determine the design-input of load for secondary structure and calculate the stress occurred at secondary structure analytically. These results lead to fatigue safety evaluation. Therefore, the evaluation of dynamic response characteristics of secondary structures on bridge can be appropriately carried out without survey data based on traffic load.(3) It is shown that the vibration controlling method of secondary structures can be effectively carried out using together chain damper and damper with granular materials. The vibration reduction effect is very effective at wide range frequency with about 2-10 Hz.Moreover, the vibration control using together spring-mass and damper with granular materials also is effective at range frequency with about 2-6 Hz.

桥梁二次结构对交通安全起着重要的作用。在进行桥梁二次结构设计时，应考虑桥梁的振动作为二次结构的设计荷载。评估时变交通荷载作用下桥梁的动力响应对二次结构的有效设计具有重要意义。利用三维有限元模型，结合实测数据对公路桥梁的振动响应进行了评价，并对某二级结构进行了应力评价。此外，还采用链式减振器与颗粒材料减振器配合使用等方法对振动控制方法进行了试验研究，分析和试验结果总结如下：(1)采用交通荷载下桥梁振动测量的反卷积分析方法，评估了桥梁结构在交通作用下的振动，以及由此产生的二次结构动力响应特性。结果表明，该方法能较准确地评价桥梁结构的振动。(2)计算结果表明，确定二次结构荷载设计输入和解析计算二次结构发生的应力是可行的。这些结果为疲劳安全性评价提供了依据。因此，基于交通荷载的桥梁二次结构动力响应特性评价可以在不需要实测数据的情况下进行。(3)研究表明，链式减振器与颗粒材料减振器配合使用可以有效地实现二级结构的振动控制。在2-10 Hz的宽频率范围内，减振效果非常有效。此外，在2 ~ 6 Hz范围内，采用弹簧质量和阻尼器与颗粒材料共同控制振动也是有效的。