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Development of sliding bearing system for multi-level earthquake motions

多级地震滑动轴承系统的开发

基本信息

批准号：
12555139
负责人：
IZUNO Kazuyuki
金额：
$ 2.56万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The aim of this study is to develop the sliding bearing system for bridges to meet the multi-level earthquakes. The integrated sliding bearing system utilizes rubber bearing plates to support the main loads, such as dead loads and live loads, and a slider-buffer system to reduce seismic response by frictional damping.It is almost impossible for any single bearing device to satisfy the functional requirements for both everyday general use and the reduction of the seismic response. Furthermore, the strength range of the earthquake motions is very wide to meet for a single device. However, it might be possible to combine one device that has everyday functionality with devices designed to meet the various range of the seismic responses.A multi-level buffer utilizes two different types of buffer in tandem. The stoppers between the two buffers would break under loads greater than Level-1 earthquakes. During Level-1 earthquakes, the displacement response would be limited not to collide with adjacent girders. In this case, the device functions as a joint protector. During Level-2 earthquakes, the stopper would break, enabling the girder to vibrate with large excursion in long natural period. This would result in large amounts of energy being absorbed by friction at the sliding interface of the bearings.The destruction probability of the stoppers was taken into account in the numerical simulations. The results showed that the variation in the strength of the stoppers did not affect the response of the whole bridge system. In this way, new systems developed from the current system would expand the application of integrated sliding bearings.

本研究的目的是发展桥梁滑动支座系统，以应付多级地震。整体式滑动支承系统利用橡胶支承板来支承恒载和活载等主要荷载，并利用滑块缓冲系统通过摩擦阻尼来减小地震反应，任何单一的支承装置几乎不可能同时满足日常使用和减小地震反应的功能要求。此外，地震运动的强度范围非常宽，以满足单个设备。然而，可以将具有日常功能的联合收割机与设计用于满足各种地震响应范围的设备组合。多级缓冲器串联使用两种不同类型的缓冲器。两个缓冲器之间的挡块在大于一级地震的载荷下会断裂。在1级地震期间，位移响应将被限制为不与相邻梁碰撞。在这种情况下，该装置用作关节保护器。在2级地震时，挡块会发生断裂，使主梁在较长的自振周期内发生大振幅振动。这将导致大量的能量被吸收的摩擦在滑动界面的轴承。破坏概率的制动器被考虑在数值模拟。结果表明，挡块强度的变化不会影响整个桥梁系统的响应。通过这种方式，从当前系统开发的新系统将扩展集成滑动轴承的应用。