首页> 外文期刊>Journal of bridge engineering >Yielding Steel Dampers as Restraining Devices to Control Seismic Sliding of Laminated Rubber Bearings for Highway Bridges: Analytical and Experimental Study
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Yielding Steel Dampers as Restraining Devices to Control Seismic Sliding of Laminated Rubber Bearings for Highway Bridges: Analytical and Experimental Study

机译:屈服的钢阻尼器作为控制公路桥梁层压橡胶轴承地震滑动的约束装置:分析和实验研究

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摘要

The performance of concrete shear keys as restraining devices for laminated rubber bearing-supported highway bridges was examined in past earthquakes such as the 1999 Chi-Chi and the 2008 Wenchuan earthquakes, where the widely observed shear key failure and bearing sliding significantly increased the risk of span unseating. To avoid such scenarios, economical yielding steel dampers are proposed to replace conventional shear keys as restraining devices on bridges. If designed properly, the steel dampers are expected to control bearing displacement within limit without imposing much additional demand on the substructure. The primary objective of this study was to develop a simplified procedure for designing the yielding steel dampers to control sliding displacement of the laminated rubber bearings to a specified value for the considered earthquake hazard. By treating the global bridge system as a serial-parallel combination of different components, the correlations of various parameters were investigated. On that basis, a simple formulation was developed, followed by a series of nonlinear time history analyses and a shake table test as verifications. The outcome of this study highlights the cost-effectiveness of using yielding steel dampers and laminated rubber bearings as an earthquake-resistant system for highway bridges compared with other popular isolation systems. The proposed design procedure was also verified to be quite efficient in properly designing the yielding steel dampers for a satisfactory bridge seismic performance.
机译:在过去的地震(例如1999年的Chi-Chi和2008年的汶川地震)中,对混凝土剪切键作为约束橡胶叠层支撑的公路桥梁的约束装置的性能进行了检验,在这些地震中,观察到的剪切键破坏和轴承滑动显着增加了发生地震的风险。跨坐。为了避免这种情况,建议采用经济的屈服型钢制减震器来代替传统的剪力键,作为桥梁上的约束装置。如果设计得当,则钢制减振器有望将轴承的位移控制在极限范围内,而不会对基础结构施加过多的额外要求。这项研究的主要目的是开发一种简化程序,用于设计屈服钢制阻尼器,以将叠层橡胶轴承的滑动位移控制为考虑到地震危险的指定值。通过将全局网桥系统视为不同组件的串并联组合,研究了各种参数的相关性。在此基础上,开发了一种简单的公式,随后进行了一系列非线性时间历史分析和振动台测试作为验证。这项研究的结果突出了与其他流行的隔离系统相比,使用屈服的钢制减震器和橡胶层压板作为公路桥梁的抗震系统的成本效益。在适当设计屈服钢制减震器以达到令人满意的桥梁抗震性能方面,所提出的设计程序也得到了验证。

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