沙漠砂混凝土动态力学性能数值模拟

发布时间：2018-08-29 08:29

【摘要】：沙漠砂混凝土动态力学性能非常复杂,利用SHPB进行沙漠砂混凝土动态冲击压缩试验,分析冲击速度对沙漠砂混凝土动态性能影响规律。编写沙漠砂混凝土圆形骨料随机分布程序,运用ANSYS/LS-DYNA软件对试件尺寸、冲击速度、粗骨料体积含量和粗骨料颗粒大小不同沙漠砂混凝土动态破坏过程进行模拟,分析试件尺寸、冲击速度、粗骨料体积含量和粗骨料颗粒大小对沙漠砂混凝土动态力学性能的影响规律。数值模拟表明:沙漠砂混凝土具有明显尺寸效应;随着粗骨料颗粒最小粒径增大,沙漠砂混凝土峰值应力逐渐减小;随着粗骨料颗粒最大粒径增大,沙漠砂混凝土峰值应力呈先增大后减小趋势;随着粗骨料体积含量增大,沙漠砂混凝土峰值应力呈先增大后减小趋势,数值模拟结果为沙漠砂混凝土优化设计提供依据。
[Abstract]:The dynamic mechanical properties of desert sand concrete are very complicated.The dynamic impact compression test of desert sand concrete is carried out by using SHPB.The influence of impact velocity on the dynamic properties of desert sand concrete is analyzed.The random distribution program of circular aggregate of desert sand concrete is compiled,and the size,impact velocity and volume of coarse aggregate are calculated by ANSYS/LS-DYNA software. The dynamic failure process of desert sand concrete with different sizes of coarse aggregate and volume fraction of coarse aggregate is simulated, and the effects of specimen size, impact velocity, volume fraction of coarse aggregate and size of coarse aggregate on the dynamic mechanical properties of desert sand concrete are analyzed. The peak stress of desert sand concrete decreases with the increase of the minimum particle size; the peak stress of desert sand concrete increases first and then decreases with the increase of the maximum particle size of coarse aggregate; the peak stress of desert sand concrete increases first and then decreases with the increase of the volume content of coarse aggregate; the numerical simulation results show that the desert sand concrete is optimized. Provide basis for design.
【作者单位】：宁夏大学土木与水利工程学院;
【基金】：国家自然科学基金项目(11162015,51368048) 教育部“长江学者和创新团队发展计划”创新团队项目(IRT1067)
【分类号】：TU528

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