| 冲击载荷作用下混凝土本构模型(英文) |
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| 引用本文： | 刘海峰,宁建国.冲击载荷作用下混凝土本构模型(英文)[J].东南大学学报,2012(1):79-84. |
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| 作者姓名： | 刘海峰 宁建国 |
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| 作者单位： | 宁夏大学土木与水利工程学院;北京理工大学爆炸科学与技术国家重点实验室 |
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| 基金项目： | The National Natural Science Foundation of China(No. 11162015);the Natural Science Foundation of Ningxia Hui Autonomous Region (No. NZ1106) |
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| 摘 要： | 为了更好地设计和分析混凝土结构,对冲击荷载作用下混凝土材料的力学特性进行了研究.将混凝土材料看成实体和微裂纹组成的复合材料,其中实体由粗骨料和水泥砂浆基体组成.假设水泥砂浆基体为弹性的、均匀的和各向同性的.基于Mori-Tanaka理论和Eshelby等效夹杂理论建立了冲击荷载作用下混凝土材料的动态本构模型.同时,进行了混凝土和水泥砂浆的冲击压缩试验.实验表明:混凝土和水泥砂浆都是率相关材料.在相同的冲击速度下,混凝土比水泥砂浆具有更高的承载能力,但混凝土的最大应变低于水泥砂浆材料.不论混凝土材料还是水泥砂浆材料,随着冲击速度的提高,破坏实验后试件的尺寸都逐渐减小.
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| 关 键 词： | 混凝土 细观力学 动态本构模型 冲击荷载 |
Constitutive model for concrete subjected to impact loading |
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| Liu Haifeng,Ning Jianguo.Constitutive model for concrete subjected to impact loading[J].Journal of Southeast University(English Edition),2012(1):79-84. |
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| Authors: | Liu Haifeng Ning Jianguo |
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| Institution: | 1Department of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China) (2State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China) |
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| Abstract: | To better design and analyze concrete structures,the mechanical properties of concrete subjected to impact loadings are investigated.Concrete is considered to be a two-phase composite made up of micro-cracks and solid parts which consist of coarse aggregate particles and a cement mortar matrix.The cement mortar matrix is assumed to be elastic,homogeneous and isotropic.Based on the Mori-Tanaka concept of average stress and the Eshelby equivalent inclusion theory,a dynamic constitutive model is developed to simulate the impact responses of concrete.The impact compression experiments of concrete and cement mortar are also carried out.Experimental results show that concrete and cement mortar are rate-dependent.Under the same impact velocity,the load-carrying capacity of concrete is higher than that of cement mortar.Whereas,the maximum strain of concrete is lower than that of cement mortar.Regardless of whether it is concrete or cement mortar,with the increase in the impact velocity,the fragment size of specimens after experiment decreases. |
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| Keywords: | concrete micromechanics dynamic constitutive model impact loading |
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