Elasto-plastic analysis of foundations during emergency shutdown due to blast loading

IF 2.1 Q2 ENGINEERING, CIVIL
Kirtika Samanta, P. Maheshwari
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引用次数: 0

Abstract

Behaviour of machine foundations is investigated in this study under harmonic loading with varying frequency and pulse loading. Owing to excessive vibrations from the pulse, the machine encounters an emergency shutdown where the machine’s exciting frequency reduces to zero exponentially. The analysis is performed considering an elastic plastic single degree of freedom system with hardening and softening behaviour. Two cases are analysed depending on the time of application of pulse loading to the foundation system. For both the cases, the governing equations of motion are acquired and solved numerically using the fourth order Runge-Kutta method. Using these solutions, displacement-time graphs are obtained for a variety of parameters such as time constant, hardening/softening index, mass of machine and the foundation block, stiffness, pulse load magnitude, damping ratio and decay coefficient to study their influence on the behaviour of the machine-foundation system. The study helps in predicting the dynamic response of foundations under the emergency shutdown conditions due to pulse loading. Further, these also help in taking the decision if there exists a need for vibration barriers to have the displacements well within the permissible limits.
爆炸荷载下紧急停堆地基弹塑性分析
本文研究了机械基础在变频谐波荷载和脉冲荷载作用下的性能。由于脉冲的过度振动,机器遇到紧急停机,机器的激励频率指数地降低到零。分析考虑了具有硬化和软化行为的弹塑性单自由度体系。分析了两种不同脉冲荷载作用时间对基础系统的影响。对于这两种情况,均采用四阶龙格-库塔法对其运动控制方程进行了数值求解。利用这些解,得到了时间常数、硬化/软化指数、机器和基础块的质量、刚度、脉冲荷载大小、阻尼比和衰减系数等各种参数的位移-时间图,研究了它们对机器-基础系统性能的影响。该研究有助于脉冲荷载下地基紧急停运的动力响应预测。此外,这些还有助于决定是否需要隔振屏障以使位移在允许范围内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.30
自引率
25.00%
发文量
48
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