超高性能海水海砂混凝土单轴受压应力-应变关系

Uniaxial Compression Stress-strain Relationship of Ultra-high Performance Seawater Sea-sand Concrete

为研究超高性能海水海砂混凝土(Ultra-High Performance Seawater Sea-sand Concrete,UHPSSC)轴压应力-应变关系,探究钢纤维体积掺量对UHPSSC轴压力学性能和轴压应力-应变全曲线的影响,使用Instron 1346万能材料试验机测得UHPSSC应力-应变全曲线,借助Pycharm曲线拟合程序与已有混凝土应力-应变全曲线模型进行拟合与修正.结果表明:钢纤维掺量越高,轴压作用下UHPSSC的破坏程度越小,抗压强度和峰值应变也随之增加;已有模型拟合的UHPSSC应力-应变全曲线上升段与试验曲线比较相近,下降段后期差距较大;通过修正下降段形状参数,得到了更适用于描述UHPSSC应力-应变全曲线的修正模型,并验证该修正模型的适用范围.

To explore the axial compressive stress-strain relationship of Ultra-High Performance Seawater Seasand Concrete(UHPSSC)and study the influence of steel fiber volume content on the axial compressive mechanical properties and axial compressive complete stress-strain curve of UHPSSC,the complete stress-strain curve of UHPSSC was obtained through the compression tests with the Instron 1346 universal material,and the Pycharm curve fitting program was used to fit and modify the existing concrete complete stress-strain curve model.The results show that the higher the steel fiber content,the smaller the damage degree of UHPSSC under axial compression,and the compressive strength and peak strain also increase.The rising section of the UHPSSC stress-strain curve fitted by the existing model is similar to the test curve,and the gap between the falling section and the later stage is large.By modifying the shape parameters of the descending section,a modified model more suitable for describing the complete stress-strain curve of UHPSSC was obtained,and the applicable scope of the modified model was verified.