The shortage of sand resources and high-rise building fires are becoming increasingly prominent. Desert sand (DS) with smaller particles can effectively fill the concrete voids and further improve its working performance; it is used as a fine aggregate to produce concrete. This article studied the performance of desert sand concrete (DSC) against fire resistance by using mathematical modeling for simulation. The stress-strain curves of desert sand mortar (DSM) after elevated temperatures were tested, and the constitutive model was established. By comparing the experiment and simulation results, it was verified that the model is suitable to be adopted in this study. Data from experiment and past literature can serve as parameters for the subsequent simulation. The destruction process of DSC under uniaxial compression after elevated temperature was simulated by using ANSYS. The simulation results indicated that, after elevated temperature, compressive strength reduced with increase of interface thickness. The compressive strength of DSC had a substantially linear increase as the interface compressive strength increased. For two-grade coarse aggregate, the optimum volume content was 45%, and particle size of it showed a significant effect on the compressive strength of DSC. The DSM constitutive model and simulation results can provide a sound theoretical basis and technical support for DSC engineering applications.

中文翻译：

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通过单轴压缩试验和界面分析研究界面相的沙漠砂混凝土（DSC）的耐火性

沙土资源短缺和高层建筑火灾日益突出。较小颗粒的沙漠砂（DS）可以有效地填充混凝土空隙并进一步改善其工作性能；它用作生产混凝土的细骨料。本文通过数学建模方法研究了沙漠砂混凝土（DSC）的抗火性能。测试了高温后沙漠砂浆（DSM）的应力-应变曲线，并建立了本构模型。通过比较实验结果和仿真结果，证明该模型适用于本研究。来自实验和过去文献的数据可以用作后续模拟的参数。利用ANSYS模拟了DSC在高温单轴压缩下的破坏过程。仿真结果表明，高温后，抗压强度随着界面厚度的增加而降低。随着界面抗压强度的增加，DSC的抗压强度基本呈线性增加。对于二级粗骨料，最佳体积含量为45％，其粒径对DSC的抗压强度具有显着影响。DSM本构模型和仿真结果可以为DSC工程应用提供良好的理论基础和技术支持。随着界面抗压强度的增加，DSC的抗压强度基本呈线性增加。对于二级粗骨料，最佳体积含量为45％，其粒径对DSC的抗压强度具有显着影响。DSM本构模型和仿真结果可以为DSC工程应用提供良好的理论基础和技术支持。随着界面抗压强度的增加，DSC的抗压强度基本呈线性增加。对于二级粗骨料，最佳体积含量为45％，其粒径对DSC的抗压强度具有显着影响。DSM本构模型和仿真结果可以为DSC工程应用提供良好的理论基础和技术支持。