Influence of geometric imperfections on the seismic performance of unanchored liquid storage tanks

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2024-08-20 DOI:10.1016/j.ijpvp.2024.105291

Lorenzo Flaño , José Colombo , Carlos Graciano , Jesús D. Villalba-Morales

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Abstract

This paper investigates the inelastic buckling of imperfect unanchored cylindrical steel tanks subjected to seismic loads. A pushover-based seismic analysis was conducted considering the impulsive hydrodynamics pressures on the wall and base plate of the tank. Material and geometric nonlinearities were considered in the seismic analysis of the tanks. Three types of imperfections were analyzed: imperfections due to impacts, imperfections located at the bottom of the tank wall, and imperfections with the first buckling mode shape. The buckling analysis was performed for two tank geometries (one slender and one broad), and the effect of the imperfections was correspondingly evaluated. The considered imperfection amplitudes were established according to the New Zealand seismic design code for storage tanks. Additionally, amplitudes that exceed the normative limit were evaluated to further analyze the sensitivity to imperfection. The analysis revealed that geometric imperfections reduce the peak ground acceleration needed to induce buckling failure. Specifically, the critical peak ground acceleration for the slender tank decreased from 0.195 g to 0.180 g for the slender tank and from 0.600 g to 0.535 g for the broad tank. This buckling capacity reduction due to geometric imperfections were about 8 % and 11 % for the slender and the broad tanks, respectively.

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几何缺陷对非锚固液体储罐抗震性能的影响

本文研究了不完善的非锚固圆柱形钢制储罐在地震荷载作用下的非弹性屈曲。考虑到油箱壁和底板上的冲击流体力学压力，进行了基于 pushover 的地震分析。罐体的抗震分析考虑了材料和几何非线性因素。分析了三类缺陷：撞击导致的缺陷、位于罐壁底部的缺陷以及具有第一屈曲模态形状的缺陷。对两种油箱几何形状（细长型和宽阔型）进行了屈曲分析，并对缺陷的影响进行了相应评估。考虑的缺陷振幅是根据新西兰储罐抗震设计规范确定的。此外，还对超过规范限制的振幅进行了评估，以进一步分析对缺陷的敏感性。分析表明，几何缺陷降低了诱发屈曲破坏所需的峰值地面加速度。具体而言，细长型水箱的临界峰值地面加速度从 0.195 g 降至 0.180 g，宽阔型水箱的临界峰值地面加速度从 0.600 g 降至 0.535 g。由于几何缺陷造成的屈曲能力降低，细长型和宽阔型水箱分别降低了约 8% 和 11%。

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.