植物纤维保温免拆模板抗折强度试验研究

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英文篇名：Experimental Study on the Flexural Strength of Botanic-fiber's Thermal Insulation and Non-dismantle Formwork 作者：何栋梁 ; 杨伟军 ; 成彦惠 英文作者：HE Dong-liang;YANG Wei-jun;CHENG Yan-hui;School of Civil Engineering,Changsha University of Science and Technology;School of Civil Engineering,Hunan University of City; 关键词：植物纤维保温免拆模板 ; 抗折强度 ; 含水率 ; 有限元分析 英文关键词：botanic-fiber's thermal insulation and non-dismantle formwork;;flexural strength;;water ratio;;finite element analysis 中文刊名：GSYT 英文刊名：Bulletin of the Chinese Ceramic Society 机构：长沙理工大学土木工程学院;湖南城市学院土木工程学院; 出版日期：2019-03-15 出版单位：硅酸盐通报 年：2019 期：v.38;No.270 基金：湖南省研究生基金(CX2017B463) 语种：中文; 页：GSYT201903049 页数：6 CN：03 ISSN：11-5440/TQ 分类号：289-294

摘要

为探究植物纤维保温免拆模板的抗折性能及含水率对抗折强度构成的影响,本研究设计了自然状态、标准状态和浸水24 h状态下植物纤维保温免拆模板抗折试件,针对三种状态试件的抗折破坏形态进行系统分析,并以标准状态试件抗折强度和位移大小与有限元建模分析结果进行对比。结果表明:三种状态试件开裂前,应力和应变大致成正比;开裂后,裂缝便在植物纤维保温层中向上快速开展,并随着试验荷载增大发生断裂,折断裂缝基本保持直线状,破坏过程变形明显,呈塑性表现性质。试验数据表明,植物纤维保温免拆模板随着含水率增大呈软化趋势,其抗折强度明显降低,变形增大。标准状态试件抗折强度和位移两项指标试验值对照有限元分析结果基本吻合,试验与有限元建模均可用做分析植物纤维保温免拆模板抗折性能的手段。
        In order to explore the impact of the flexural resistance and water content of botanic-fiber 's thermal insulation and non-dismantle formwork on the composition of the flexural strength,the nondisassembled template flexural specimens for plant fiber insulation under natural conditions,standard conditions and water immersion for 24 h were designed. The state-of-the-art specimens were systematically analyzed for their fracture-resistance failures,and the flexural strength and displacement of the specimens in the standard state were compared with those of the finite element modeling analysis. The results show that: (1) before the cracking of the three state specimens,the stress and strain are approximately proportional; after the cracking,the cracks develop rapidly in the insulation layer of the plant fiber,and the fracture occurs along with the increase of the test load,and the breakage cracks remain substantially linear destruction of the deformation process is obvious,showing the nature of plasticity. (2) The experimental data shows that the botanic-fiber's thermal insulation and non-dismantle formwork is softened with the increase of moisture content,and its flexural strength is significantly reduced and the deformation is increased. (3) The test values of flexural strength and displacement in the standard state specimens are basically consistent with the experimental results of the finite element analysis. Both the test and finite element modeling can be used as a means to analyze the flexural properties of the botanic-fiber's thermal insulation and non-dismantle formwork.

引文

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