Research on the input ground motion and analysis of the floating-roofed oil storage tanks

在2003年十胜冲地震（M = 8.0）中，由于长周期地面运动，许多储油罐在Tomakomai的晃动严重损坏。在这项研究中，我们调查的长周期地面运动的特点和反应的油罐浮顶，以减轻这种损害，未来的大地震。主要结果如下：1）我们检验了十胜冲地震及其两次大余震期间由汤抚平原K网记录得到的水平平原上的地面速度轨道，发现了Tomakomai地震地面运动的多向性，这可能是由于地下结构的三维不均匀性造成的; 2）我们在Tomakomai的IDEMITSU炼油厂的场地上处理了强震加速度记录，得到了很大的PSV（h = 0.5%）值; 3）为了用简化的半经验方法获得长周期谱水平，我们检验了K ...更多信息 udo（1989）利用K-net Tomakomai场地周围的多个十胜冲地震余震记录，提出该场地的场地放大因子大于以前的值（扎马，1998）。4）通过Sakai等人开发的线性流体弹性振动分析，本文详细研究了考虑单层和双层弹性浮顶存在时浮顶的晃动特性。为了防止浮箱在甲板上的屈曲，我们定量地研究了在浮箱中间歇放置加强筋和橡胶的影响（一种隔离方法; Sakai和Inoue，2005），其中我们包括几何和材料非线性。6）我们提出并检验了一种通过TLCD（Sakai等人，1989）通过对浮顶与所含液体相互作用振动的分析，建立了浮顶与所含液体相互作用振动的数学模型。少

During 2003 Tokachi-oki earthquake (M=8.0), many oil storage tanks in Tomakomai were damaged severely by sloshing due to long-period ground motion. In this research, we investigated the characteristics of the long-period ground motion and responses of the floating roofs of the oil tanks in order to mitigate such damages by future large earthquakes. The main results obtained are as follows:1) We examined the orbits of the ground velocities in the horizontal plain obtained by the K-net records in Yufutsu plain during the Tokachi-oki earthquake and its two large aftershocks, and found that the multi-directionality of ground motions at Tomakomai which is probably due to the 3-D heterogeneity of the underground structure.2) We processed the strong-motion accelerogram on the premises of IDEMITSU refinery at Tomakomai, and obtained very large PSV (h=0.5%) values.3) To obtain the long-period spectral level by the simplified semi-empirical method, we examined the prediction method proposed by K … More udo (1989) using many aftershock records of Tokachi-oki earthquake at around the K-net Tomakomai site, and suggested that the site amplification factor at the site is larger than the previous value (Zama,1998).4) Through the linearized fluid-elastic vibration analysis developed by Sakai et al., we investigated in detail the floating -roof sloshing behaviors taking into consideration of the existence of the elastic floating-roofs with single-deck type and double deck type. We conducted the parametric study to clarify which parameter affects mostly to the stresses in the pontoon.5) To prevent the buckling of the pontoon of the deck, we examined quantitatively the effects of the stiffeners and the rubber placed intermittently in the pontoon (a kind of isolation method ; Sakai and Inoue,2005) by ABAQUS, where we included geometrical and material nonlinearity.6) We proposed and examined a vibration control method of floating-roof sloshing by TLCD (Sakai et al.,1989) through the analysis of the interactive vibration between a floating-roof and contained liquid. Less