| 朱亚飞,任伟新.基于动力响应峰值的结构碰撞荷载峰值识别[J].计算力学学报,2025,42(1):44~52 |
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| 基于动力响应峰值的结构碰撞荷载峰值识别 |
| Structural impact load identification based on peak dynamic response |
| 投稿时间：2023-08-07 修订日期：2023-10-13 |
| DOI：10.7511/jslx20230807001 |
| 中文关键词: 结构碰撞 结构响应 碰撞荷载 荷载识别 峰值 |
| 英文关键词:structural impact structural response Impact load Load identification peak value |
| 基金项目:深圳市科创委项目(JSGG20210802093207022;KQTD20180412181337494;ZDSYS20201020162400001)资助. |
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| 摘要点击次数: 15 |
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| 中文摘要: |
| 船舶或车辆等与桥梁结构的碰撞是一个复杂的动态过程,结构发生碰撞的冲击荷载模式一般呈现半正弦分布。鉴于长期健康监测系统在重大结构中的广泛应用,如何仅利用结构的动力响应来识别突发碰撞荷载成为一个亟需解决的问题,其关键在于找到动力响应与碰撞荷载之间的关系。本文以梁受半正弦碰撞冲击作用为力学模型,基于模态叠加法和杜哈姆积分求解梁的动力响应,构造结构动力响应峰值和碰撞荷载峰值之间的相关关系。结果表明响应峰值与碰撞荷载峰值之间存在线性关系,且该线性关系不受碰撞持续时间和结构响应位置的影响,梁在不同碰撞冲击力试验进一步验证了该线性关系。因此,如果知道结构两个或以上不同位置动力响应峰值,利用响应峰值与碰撞荷载峰值之间的线性关系,便可确定冲击荷载峰值的大小。该方法不涉及动力学逆问题复杂的理论计算,依据此线性关系便可由结构的动力响应峰值估算碰撞荷载的峰值,实现结构意外碰撞时碰撞荷载峰值的识别。 |
| 英文摘要: |
| The collision between a ship or a vehicle and a bridge structure is a complex dynamic process,and the impact load pattern of collision generally is a semi-sinusoidal distribution.Given the extensive application of long-term health monitoring systems in major structures,it is an urgent problem to identify the impact load using only the dynamic response of structures,the key to which is to find the relationship between the impact load and the dynamic response.Taking a beam subjected to half-sine impact as a mechanical model,the dynamic response of the beam is obtained based on the modal superposition method and Duhamel's integral,and the correlation between the peak dynamic response of the structure and the peak impact load is constructed.The results show that there is a linear relationship between the peak response and the peak impact load,and that this linear relationship is independent of the impact duration and the location of structural response,which is further verified by the beam tested at different impact forces.Therefore,if the peak dynamic response of a structure is known at two or more different locations,the peak impact load can be determined using the linear relationship between the peak response and the peak impact load.The method does not involve complicated theoretical calculations of dynamic inverse dynamic problems and enables the identification of impact loads in the event of accidental impact of a structure. |
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