西安建筑科技大学学报(自然科学版)

重型储仓结构广泛用于工业生产,尽管遵照现行设计标准规范能够满足结构体系的性能目标,但非结构构件及设备损害严重,对非结构构件与设备的抗震研究愈发重要。本文以某典型高架式储仓结构为研究对象,为研究储仓中储料装载量的变化对楼面反应谱的影响,建立了不同储仓装载量的设备-结构耦合模型。选择18组与加速度设计反应谱匹配的地震动为输入,对每个模型开展弹塑性时程分析,以得到储仓支承位置的非线性楼面反应谱。根据得到楼面反应谱特点提出了针对重型储仓非线性楼面反应谱的标定方法。结果表明,储仓装载量影响结构的自振周期以及非线性楼面反应谱峰值,使用的非线性楼面反应谱标定方法经振动台试验验证准确合理。

Heavy silos are widely used in industrial activities. Following the modern design codes, industrial building structures could meet the performance objectives under earthquakes. However, the non-structural components and equipment tend to be seriously damaged, which requires further research efforts. In this paper, a typical elevated silo structure is focused. In order to study the influence of the change of the storage volume in the silo on the floor response spectrum, an equipment-structure integration model of different storage silo loading was established. Eighteen ground motions matching the acceleration design response spectrum were selected as input, and response-history analysis was carried out for each model to obtain the dynamic response of the structure and the nonlinear floor response spectrum of the silo support position. With the obtained floor response spectrum, a standardization approach for the nonlinear floor response spectrum of heavy silo was proposed. The results show that the storage volume of the silo would affect the natural vibration period of the structure and the peak value of the nonlinear floor response spectrum. The effectiveness of the nonlinear floor response spectrum standardization is verified by shaking table test.

引言
1 结构模型概况及数值模拟
2 主结构与储仓动力特性分析
3 地震动选取与时程分析设置
4 装载量变化下楼面反应谱分析
5 楼面反应谱标准化
6 振动台试验验证
7 结论

图1 储仓-主体结构几何信息与有限元模拟示意图<br/>Fig.1 Schematic diagram of silo-main structure geometric information and finite element simulation

图1 储仓-主体结构几何信息与有限元模拟示意图
Fig.1 Schematic diagram of silo-main structure geometric information and finite element simulation

表1 不同装载量储仓质量占比<br/>Tab.1 Storage mass ratio of different loading capacity

表1 不同装载量储仓质量占比
Tab.1 Storage mass ratio of different loading capacity

表2 不同储仓装载量设备-结构一体化模型模态周期<br/>Tab.2 Modal periods of equipment-structure integration models with different storage loads

表2 不同储仓装载量设备-结构一体化模型模态周期
Tab.2 Modal periods of equipment-structure integration models with different storage loads

图2 选取18条地震动反应谱均值与目标谱匹配结果<br/>Fig.2 Mean response spectrum of selected 18 ground motions and target design spectrum

图2 选取18条地震动反应谱均值与目标谱匹配结果
Fig.2 Mean response spectrum of selected 18 ground motions and target design spectrum

图3 不同储仓装载量楼面反应谱<br/>Fig.3 Floor response spectrum for storage silos with different loading cases

图3 不同储仓装载量楼面反应谱
Fig.3 Floor response spectrum for storage silos with different loading cases

图4 重型储仓设备抗震设计反应谱<br/>Fig.4 Seismic design response spectrum of heavy storage equipmen

图4 重型储仓设备抗震设计反应谱
Fig.4 Seismic design response spectrum of heavy storage equipmen

图5 不同装载量楼面动力放大系数<br/>Fig.5 Dynamic amplification factor at story floor for storage silos with different loading cases

图5 不同装载量楼面动力放大系数
Fig.5 Dynamic amplification factor at story floor for storage silos with different loading cases

图6 振动台模型示意<br/>Fig.6 Shaking table model

图6 振动台模型示意
Fig.6 Shaking table model

图7 振动台储仓模型与振动台配重<br/>Fig.7 Simplified silo equipment and attached mass for the shaking table model

图7 振动台储仓模型与振动台配重
Fig.7 Simplified silo equipment and attached mass for the shaking table model

表3 振动台工况明细<br/>Tab.3 Working condition details of shaking table model.

表3 振动台工况明细
Tab.3 Working condition details of shaking table model.

图8 选取地震动楼面动力放大系数标定<br/>Fig.8 Calibration for the floor spectrum in terms of the dynamic amplification factor

图8 选取地震动楼面动力放大系数标定
Fig.8 Calibration for the floor spectrum in terms of the dynamic amplification factor

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备注

引言

1 结构模型概况及数值模拟

2 主结构与储仓动力特性分析

3 地震动选取与时程分析设置

4 装载量变化下楼面反应谱分析

5 楼面反应谱标准化

6 振动台试验验证

7 结论

期刊信息