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首页> 外文期刊>Bulletin of earthquake engineering >Damage analysis of cut-and-cover tunnel structures under seismic loading
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Damage analysis of cut-and-cover tunnel structures under seismic loading

机译：地震作用下明挖隧道结构的破坏分析

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Damage analyses of rectangular cut-and-cover tunnels are performed to define the damage states and corresponding damage indices (DIs) under seismic loading. Single, double, and triple box structures designed for metro subway systems in South Korea are used. The tunnel structures are modeled by nonlinear frame elements attached to a series of normal and shear springs to simulate the soil-tunnel interaction. Pushover analyses are performed to develop the capacity curves and to monitor the development of plastic hinges. Parallel elastic analyses are also performed to determine the elastic moments at which plastic hinges form. For each tunnel and site condition, three damage states, which are minor, moderate, and extensive, are defined in terms of number of plastic hinges that form at the corners of the tunnel structure. Each damage state is linked to the corresponding DI, which is defined as the ratio of the elastic moment to the yield moment and free-field shear strain. DI for the single box tunnel is shown to be mostly independent of the shear wave velocity of soil. The values of DIs for single, double, and triple box tunnels range from 1.0 to 2.0. It is highlighted that the proposed damage state associated with DI and shear strain provide an enhanced estimate of the seismically induced damage of box tunnels and can be easily utilized in a performance-based design.
机译：进行矩形开挖-覆盖隧道的损伤分析，以定义地震荷载作用下的损伤状态和相应的损伤指数（DI）。使用为韩国地铁系统设计的单，双和三箱结构。隧道结构是通过非线性框架单元建模的，该框架单元附加到一系列的法向弹簧和剪切弹簧上，以模拟土-隧道相互作用。进行Pushover分析以建立容量曲线并监视塑料铰链的发展。还执行平行弹性分析，以确定塑料铰链形成时的弹性力矩。对于每种隧道和工地条件，根据在隧道结构拐角处形成的塑料铰链的数量来定义三种损坏状态，分别是轻微，中度和广泛。每个损伤状态都与相应的DI关联，DI定义为弹性矩与屈服矩的比值以及自由场剪切应变。结果表明，单箱隧道的DI基本上与土壤的剪切波速度无关。单框，双框和三框隧道的DI值范围为1.0到2.0。需要强调的是，与DI和剪应变相关的拟议破坏状态提供了对地震引起的箱形隧道破坏的增强估计，并且可以轻松地用于基于性能的设计中。

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