石灰稳定夯土高温后应变软化的统计损伤模型

IF 4 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yi Luo, Chao Ye, Pengpeng Ni, Zhixing Zeng, Yixian Liu
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引用次数: 0

摘要

许多历史悠久的土楼由于过去的火灾而遭到破坏。了解高温后夯土的强度退化情况,对指导建筑保护或修复策略具有重要意义。对石灰稳定夯土试件进行了温度高达700℃的无侧限压缩试验,共进行了24次。夯土的强度和刚度随温度的升高呈准线性降低。高温下,夯土的延性得到增强,在700℃和20℃时,峰值应变强度分别达到2.5%和1.5%。显微组织分析表明,随着温度的升高,试样变得更加多孔,碳酸钙的析出减少,这解释了强度的降低。提出了一种新的热损伤模型来描述夯土在高温下的行为,该模型通过捕捉孔隙的闭合来表示不可恢复的变形,并使用热损伤变量对骨架部分进行了统计模拟,以表示损伤演化(应变软化)。通过与实测应力-应变曲线的对比,证实了该方法可以有效地预测夯土在高温作用下的响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Statistical damage model with strain softening for lime-stabilized rammed earth after elevated temperature
Many historical earthen buildings are damaged due to fire exposure in the past. It is important to understand the strength degradation of rammed earth after elevated temperature for guiding the strategy of building protection or rehabilitation. A total of 24 unconfined compression tests are conducted on lime-stabilized rammed earth specimens after elevated temperature up to 700°C. A quasi-linear reduction in strength and stiffness is found for rammed earth with the increase of temperature. At high temperature, the ductility of rammed earth is enhanced, e.g., strain at peak strength of 2.5% and 1.5% at 700°C and 20°C, respectively. Microstructural analyses demonstrate that with the increase of temperature, the specimen becomes more porous with reduced calcium carbonate precipitation, explaining the strength reduction. A new thermal damage model is proposed to describe the behavior of rammed earth after elevated temperature, in which the closure of pores is captured to show unrecoverable deformation, and the skeleton part is simulated using a thermal damage variable in a statistical manner to present the damage evolution (strain softening). By comparing with the measured stress-strain curves, one can confirm that the proposed method can provide effective prediction for the response of rammed earth after elevated temperature.
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来源期刊
International Journal of Damage Mechanics
International Journal of Damage Mechanics 工程技术-材料科学:综合
CiteScore
8.70
自引率
26.20%
发文量
48
审稿时长
5.4 months
期刊介绍: Featuring original, peer-reviewed papers by leading specialists from around the world, the International Journal of Damage Mechanics covers new developments in the science and engineering of fracture and damage mechanics. Devoted to the prompt publication of original papers reporting the results of experimental or theoretical work on any aspect of research in the mechanics of fracture and damage assessment, the journal provides an effective mechanism to disseminate information not only within the research community but also between the reseach laboratory and industrial design department. The journal also promotes and contributes to development of the concept of damage mechanics. This journal is a member of the Committee on Publication Ethics (COPE).
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