Experimental study on splitting tensile behavior and energy dissipation of autoclaved aerated concrete under dynamic loading

IF 7.4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-10-06 DOI:10.1016/j.jobe.2025.114327

Ziliang Xiong, Xudong Chen, Chenbei Fan, Lulu Chen, Zhenwei Liu, Kailong Lu

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引用次数: 0

Abstract

Dynamic splitting tensile tests were carried out on autoclaved aerated concrete (AAC) with different strength grades (A2.5, A3.5, A5.0) using a split Hopkinson pressure bar (SHPB) system. Crack evolution and strain field distribution were captured through high-speed photography combined with the digital image correlation (DIC) technique. The results revealed that AAC exhibits pronounced strain rate sensitivity, with the dynamic increase factor (DIF) following a logarithmic relationship with strain rate. Energy dissipation was found to increase nearly linearly, and greater dissipation was observed in higher-strength AAC owing to its denser microstructure. The failure mechanism was generally characterized by a combined tensile-shear mode, and crack propagation velocity was elevated with increasing strain rate and material strength. Moreover, a delayed energy dissipation response was identified, which contributed to the enhancement of dynamic strength. These findings not only clarify the dynamic response and damage mechanisms of AAC under high strain rates but also provide parameters for numerical simulations and theoretical support for its application in impact-resistant design and protective structures.

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动载下蒸压加气混凝土劈裂拉伸性能及耗能试验研究

采用分离式霍普金森压杆（SHPB）系统对不同强度等级（A2.5、A3.5、A5.0）的蒸压加气混凝土（AAC）进行了动态劈裂拉伸试验。采用高速摄影技术结合数字图像相关技术（DIC）捕捉裂纹演化和应变场分布。结果表明，AAC表现出明显的应变率敏感性，动态增加因子（DIF）与应变率呈对数关系。能量耗散几乎呈线性增加，并且由于高强度AAC的微观结构更致密，耗散更大。破坏机制总体上表现为拉剪联合破坏模式，裂纹扩展速度随着应变速率和材料强度的增加而增大。此外，还发现了一种延迟能量耗散响应，这有助于提高动强度。这些研究结果不仅阐明了高应变速率下AAC的动态响应和损伤机理，而且为其在抗冲击设计和防护结构中的应用提供了数值模拟参数和理论支持。

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

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.