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Seismic rocking effects on a mine tower under induced and natural earthquakes
Archives of Civil and Mechanical Engineering ( IF 4.4 ) Pub Date : 2021-04-02 , DOI: 10.1007/s43452-021-00221-7
Piotr Adam Bońkowski , Juliusz Kuś , Zbigniew Zembaty

Recent research in engineering seismology demonstrated that in addition to three translational seismic excitations along x, y and z axes, one should also consider rotational components about these axes when calculating design seismic loads for structures. The objective of this paper is to present the results of a seismic response numerical analysis of a mine tower (also called in the literature a headframe or a pit frame). These structures are used in deep mining on the ground surface to hoist output (e.g. copper ore or coal). The mine towers belong to the tall, slender structures, for which rocking excitations may be important. In the numerical example, a typical steel headframe 64 m high is analysed under two records of simultaneous rocking and horizontal seismic action of an induced mine shock and a natural earthquake. As a result, a complicated interaction of rocking seismic effects with horizontal excitations is observed. The contribution of the rocking component may sometimes reduce the overall seismic response, but in most cases, it substantially increases the seismic response of the analysed headframe. It is concluded that in the analysed case of the 64 m mining tower, the seismic response, including the rocking ground motion effects, may increase up to 31% (for natural earthquake ground motion) or even up to 135% (for mining-induced, rockburst seismic effects). This means that not only in the case of the design of very tall buildings or industrial chimneys but also for specific yet very common structures like mine towers, including the rotational seismic effects may play an important role.



中文翻译:

诱发地震和自然地震对矿塔的地震摇摆影响

工程地震学的最新研究表明,除了沿xyz的三个平移地震激发之外在计算结构的设计地震荷载时,还应该考虑绕这些轴的旋转分量。本文的目的是提出对矿塔(在文献中也称为井架或基坑框架)进行地震响应数值分析的结果。这些结构用于地下深层采矿,以提升产量(例如,铜矿石或煤炭)。矿山塔属于细长的高大结构,对于它们而言,晃动的激发可能很重要。在数值示例中,根据两条记录同时分析了诱发的矿山震动和自然地震的同时晃动和水平地震作用,分析了一个高64 m的典型钢框架。结果,观察到摇摆地震效应与水平激励的复杂相互作用。摇摆分量的贡献有时可能会降低整体地震响应,但是在大多数情况下,它会大大增加所分析头部框架的地震响应。结论是,在分析的64 m采矿塔的情况下,包括摇摆地震动效应在内的地震响应可能会增加31%(对于自然地震地震动),甚至可能增加135%(对于采矿诱发的地震动)。 ,岩爆地震影响)。这意味着,不仅在设计非常高的建筑物或工业烟囱时,而且对于某些特殊但非常常见的结构(例如矿塔),包括旋转地震效应也可能起重要作用。结论是,在分析的64 m采矿塔的情况下,包括摇摆地震动效应在内的地震响应可能会增加31%(对于自然地震地震动),甚至可能增加135%(对于采矿诱发的地震动)。 ,岩爆地震影响)。这意味着,不仅在设计非常高的建筑物或工业烟囱时,而且对于某些特殊但非常常见的结构(例如矿塔),包括旋转地震效应也可能起重要作用。结论是,在分析的64 m采矿塔的情况下,包括摇摆地震动效应在内的地震响应可能会增加31%(对于自然地震地震动),甚至可能增加135%(对于采矿诱发的地震动)。 ,岩爆地震影响)。这意味着,不仅在设计非常高的建筑物或工业烟囱时,而且对于某些特殊但非常常见的结构(例如矿塔),包括旋转地震效应也可能起重要作用。

更新日期:2021-04-02
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