碱矿渣混凝土动态压缩性能试验研究及数值模拟

Experimental Study and Numerical Simulation on Dynamic Compressive Properties of Alkali Activated Slag Concrete

为研究碱矿渣混凝土(AASC)材料的动态压缩性能及损伤破坏机理,以应变率(39 s^(-1)、57 s^(-1)、75 s^(-1))为变量,开展了动态压缩性能试验;并对试验结果进行分析,获得三种应变率条件下该材料的应力-应变关系曲线。曲线分析显示其峰值应力和应变均随应变率的提高而增大,表明AASC属于应变率敏感材料。采用HJC本构模型开展动态压缩数值模拟,结果显示应力-应变关系曲线数值模拟结果与试验结果较为吻合,其累积损伤破坏过程是由中心向外围逐渐破坏。

Dynamic compressive experimental was carried out by changing the strain rate(39 s-1,57 s-1,75 s-1)to investigate the dynamic compressive properties and damage mechanism of alkali activated slag concrete(AASC).Getting the stress-strain curves of AASC under the different strain rates,the curve analysis results show that the peak stress and peak strain increase with the increase of strain rate,indicates the AASC is a strain rate sensitive material.Numerical simulation was done with the HJC constitutive model,result shows the stress-strain curve of numerical simulation and experimental were simulated.And the damage mechanism of AASC is beginning in the center and accordingly outward.