| 摘要: |
| 采用试验和三维随机骨料细观模型，研究了全珊瑚海水混凝土（CASC）在高温前后的静动态力学性能、抗侵彻和防爆性能. 结果表明：添加剑麻纤维能有效改善CASC的脆性；随着温度的提高，CASC的残余抗压强度先增后减；经历高温后CASC的静动态力学性能明显降低，温度越高，高温弱化效应越明显. 提出了描述CASC高温后受压应力-应变关系的两段式方程.建立了一种适用于CASC的三维随机骨料细观模型，数值模拟结果与试验结果较为吻合. |
| 关键词: 全珊瑚海水混凝土 准静态力学性能 动态力学性能 应变率效应 数值模拟 |
| DOI：10.3969/j.issn.1007-9629.2023.11.003 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（52078250，51878350，11832013，51678304，51508272） |
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| Static and Dynamic Mechanical Properties of Coral Aggregate Seawater Concrete and Their Numerical Simulation |
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MA Haiyan1, YU Hongfa1, GUO Jianbo1, MEI Qiquan2, LIU Ting1
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1.College of Civil Aviation， Nanjing University of Aeronautic and Astronautic， Nanjing 211106， China;2.School of Civil Engineering， Sanjiang University， Nanjing 210012， China
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| Abstract: |
| The static and dynamic mechanical properties， intrusion resistance and explosive performance of coral aggregate seawater concrete （CASC） before and after high temperature， and their numerical simulation of a three-dimensional random aggregate mesoscopic model were studied. The results show that the addition of sisal fibers can effectively improve the brittleness of CASC. The residual compressive strength of CASC increases and then decreases as the temperature increases. A two-part equation describing the stress-strain relationship of CASC after high temperature was proposed； the static and dynamic mechanical properties of CASC after high temperature are significantly reduced， and the higher the temperature， the more obvious the high temperature weakening effect. A three-dimensional random aggregate mesoscopic model was established for CASC， and the numerical simulation results are in good agreement with the experimental results. |
| Key words: coral aggregate seawater concrete （CASC） quasi-static mechanical property dynamic mechanical property strain rate effect numerical simulation |
