大豆散料-钢板筒仓模型动力相互作用试验

Tests on Dynamic Interaction of Soybean Storage and Steel Silo Model

为揭示粮食散料与仓体之间相互作用对结构体系地震反应的影响,进行了空仓、半仓大豆和满仓大豆3种储粮状态下的钢筒仓模型振动台试验,从动力特性、加速度反应和耗能特性等方面研究了不同堆料高度与不同输入峰值加速度对模型地震反应的影响规律,并对大豆-钢板筒仓体系的动力相互作用程度进行定量分析。结果表明:试验模型空仓、半仓和满仓的一阶频率分别为109.6 Hz、59.4 Hz和49.5 Hz,阻尼比为1.2%、23.4%和6.7%;大豆-钢板筒仓模型随着堆料高度增加,其一阶频率显著降低,阻尼比呈现先增大后减小的趋势;输入峰值加速度的增大加剧了大豆与筒仓的相互作用程度,从而改变了模型最大幅值点位置和动力放大系数的垂直分布;贮料与筒仓耦合系统的耗能减震能力随大豆贮料的增加而提升;贮料与钢板筒仓之间存在相对运动的临界位置。

In order to reveal the effect of the interaction between grain and silo on the seismic response of the structural system,the shaking table tests were carried out on the steel silo model under three grain storage states of empty,half-silo and full silo.The effects law of different stacking height and input peak acceleration on the model seismic response were studied from the aspects of dynamic characteristics,acceleration response and energy dissipation characteristics,and the dynamic interaction degree of soy-steel silo system was quantitatively analyzed.The results show that the first-order frequencies of empty,half-silo and full silo are 109.6 Hz,59.4 Hz,and 49.5 Hz,respectively,and the damping ratios are 1.2%,23.4%,and 6.7%,respectively.The first-order frequency of soy-steel silo model decreases significantly with the increase of stacking height,and the damping ratio increases first and then decreases.The increase of the input peak acceleration intensifies the interaction between the soy and the silo,which changes the position of the maximum amplitude point and the vertical distribution of the dynamic amplification factor.The energy dissipation capacity of storage material and silo coupling system increases with the increase of soybean storage.There is a critical position of relative movement between the storage material and the steel silo.