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首页> 外文会议>International Conference on Remote Sensing, Environment and Transportation Engineering >Shock Isolation and Absorption of Continuous Girder Bridge Subjected to Blast Loading in the Underground Tunnel
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Shock Isolation and Absorption of Continuous Girder Bridge Subjected to Blast Loading in the Underground Tunnel

机译：在地下隧道中进行爆破加载的连续梁桥的冲击隔离和吸收

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Dynamic responses of a continuous girder bridge with the rubber bearings, together with its shock absorption effects when the viscous dampers are installed respectively in the transverse direction of the structure and in its longitudinal direction, under the blast loading in an underground tunnel adjacent and paralleled to the bridge are numerically analyzed. The LS-DYNA software is used to establish a three-dimensional coupling model consisting of the tunnel, soil around, water in the channel and the continuous girder bridge. For this model, some processes, such as the calculating and loading of the in-tunnel explosion, the selecting of the constitutive models of soil and concrete material, the defining of the water model and the water-pier and water-soil interaction, the introducing of boundary condition of far-field soil, and the building of mechanical models of the rubber bearing and the viscous damper, are carried out appropriately. Based on numerous and systematic example analyses, it is demonstrated that the rubber bearings set on the continuous girder bridge show better shock isolation performance under an impact from an adjacent in-tunnel explosion, and in general there is an increasing trend in the deformations and internal forces of the bridge slab while the water-level is rising gradually from a zero start point. Besides, not only are the shock absorption effects of the transversely-set dampers on the transverse and vertical deformation and the internal force of the bridge slab disclosed, but also some shock absorbed laws of the longitudinally-set dampers to the longitudinal and vertical deformation and the internal force of the bridge slab are also summarized. This provides an important reference for the research and practice of explosion-proof bridge subjected to the underground and underwater blast waves.
机译：用橡胶轴承的连续梁桥的动力响应，以及其减震效果，当粘性阻尼器分别在结构的横向方向上和其纵向方向上时，在邻近的地下隧道中的爆破载荷下桥梁在数值上分析。 LS-DYNA软件用于建立由隧道，周围的隧道，土壤，通道中的水和连续梁桥组成的三维耦合模型。对于该模型，一些过程，例如隧道爆炸的计算和装载，选择土壤和混凝土材料的本构模型，水模型的定义和水土和水土互动，介绍了远场土壤的边界条件，以及橡胶轴承和粘性阻尼器的机械模型的建设。基于许多和系统的示例分析，证明了在连续梁桥上设定的橡胶轴承在相邻的隧道爆炸的影响下显示出更好的冲击隔离性能，并且一般来说，变形和内部存在越来越大的趋势桥梁板坯的力，而水位从零点开始逐渐上升。此外，不仅是横向设定阻尼器对横向和垂直变形的减震效果以及所公开的桥板板的内力，而且还有一些纵向设定阻尼器的抗冲击定律与纵向和垂直变形和垂直变形还总结了桥板的内部力。这为经过地下和水下爆炸波进行了防爆桥的研究和实践提供了重要参考。

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