Damage quantification based on drift ratios and axial capacity degradation for RC columns under low-velocity impact loads

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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Abstract

Damage determination and quantification are critical issues in conducting damage assessment and performance-based design for RC columns under low-velocity impact loads. An impediment in these issues lies in defining reasonable damage criteria. To this end, a framework inspired by existing experimental results is proposed to quantify the damage of RC columns. The core concept of this framework is to establish the relationship between the engineering demand parameter (i.e., drift ratio) and the damage index based on residual axial capacity and to convert the damage index threshold to the drift ratio threshold using a reliability-based method. According to the proposed framework, damage criteria are developed for RC columns in two typical impact scenarios, including the mid-span and near-base impacts. During this process, linear relationships between the maximum drift and the residual one at the impact location are developed by statistically analyzing the existing experimental data (a total of 212 test samples). Based on experimentally validated numerical models, empirical formulas for estimating the residual axial capacity of RC columns are established. The maximum drift, the residual drift, and the axial capacity degradation are interrelated in the proposed damage criteria, overcoming the limitation that the current deformation-based damage criteria used for low-velocity impact loads lack physical significance.

低速冲击荷载下基于漂移率和轴向承载力衰减的 RC 柱损伤量化
在对低速冲击荷载下的 RC 柱进行损坏评估和基于性能的设计时,损坏的确定和量化是关键问题。这些问题的障碍在于如何定义合理的损伤标准。为此,我们受现有实验结果的启发,提出了一个量化 RC 柱损坏的框架。该框架的核心理念是建立工程需求参数(即漂移率)与基于残余轴向承载力的损坏指数之间的关系,并使用基于可靠性的方法将损坏指数阈值转换为漂移率阈值。根据所提出的框架,为 RC 柱制定了两种典型冲击情况下的损坏标准,包括跨中冲击和近基底冲击。在此过程中,通过对现有实验数据(共 212 个测试样本)进行统计分析,建立了最大漂移与冲击位置残余漂移之间的线性关系。根据实验验证的数值模型,建立了用于估算 RC 柱残余轴向承载力的经验公式。在所提出的破坏标准中,最大漂移、残余漂移和轴向承载力衰减是相互关联的,克服了目前用于低速冲击荷载的基于变形的破坏标准缺乏物理意义的局限性。
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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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