全尺寸 RC 梁在高能量冲击下的动态响应实验研究

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

摘要

大多数钢筋混凝土(RC)结构的冲击试验都是小能量和缩小尺度试验。由于应变率下的尺寸效应,缩小尺度试验和全尺度试验的动态响应存在很大差异,因此不宜根据缩小尺度试验结果设计冲击荷载下的全尺度结构。本文首次比较了坠重冲击试验对缩小尺度和全尺度钢筋混凝土 (RC) 梁的影响。实验结果用于确定基于缩小尺度结构的低能量冲击试验而开发的相似性法则的适用极限。由于缩尺试样刚度较低,其破坏模式是典型的弯曲。相比之下,全尺寸试样的弯曲刚度要高得多,因此更容易发生剪切破坏。由于冲击力与反作用力的比值会随着 RC 梁几何尺寸的增大而减小,因此根据缩尺冲击试验的理论推断出的全尺寸 RC 梁的反作用力很可能会低于实际情况,从而导致不安全的设计。现有的有效长度分析方法只考虑了冲击力达到峰值之前的阶段,无法处理全尺寸 RC 梁在非线性变形情况下的有效长度变化。目前考虑结构总质量的冲击试验能量理论无法准确反映结构能量损失远大于吸收能量的全尺寸试验效果。考虑有效质量的全尺寸结构能量分析方法更为合理。缩小尺度试验的指导在全尺度试验中并不适用,而且通过使用 DLV 系统,缩小尺度结构和全尺度结构的受力偏差较大。为了解决这些问题,本文提出了 GVH 系统的相似律。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental investigation of dynamic response of full-scale RC beams under high-energy impact

Most impact tests of reinforced concrete (RC) structures are small-energy and reduced-scale tests. Due to the size effects under strain rate, there are large differences in the dynamic responses between reduced-scale and full-scale tests, which makes it inappropriate to design full-scale structures under impact loading based on reduced-scale test results. This paper presents the first results to compare the effects of drop weight impact tests on reduced and full-scale reinforced concrete (RC) beams. The experimental results are used to identify limits of applicability of the similarity laws that have been developed based on low-energy impact tests on reduced-scale structures. Due to low stiffness of the reduced-scale specimens, their failure mode is typical of bending. In contrast, the full-scale specimens have much higher bending stiffness and therefore are more prone to shear failure. Since the ratio of impact force to reaction force decreases as the geometric dimensions of RC beams increase, it is likely that the reaction forces of full-scale RC beams inferred from theories based on the reduced-scale impact test will be lower than in real situation, which could lead to unsafe design. The existing effective length analysis method only considers the stage before the impact force reaches the peak value and cannot deal with the change in effective length of full-scale RC beams with nonlinear deformation. The current theory of energy for impact test that considers the total mass of the structure cannot accurately reflect the effect of full-scale tests in which the loss of energy of the structure is much higher than the absorbed energy. The energy analysis method for full-scale structures is more reasonable when considering the effective mass. The guidance of reduced-scale test is not applicable in full-scale test, and the large deviation of forces between the reduced-scale and full-scale structures by using the DLV systems. To rectify these problems, this paper proposes a similarity law for GVH systems.

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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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