冲击荷载下钢渣细骨料混凝土力学特性及本构关系

doi:10.6040/j.issn.1672-3961.0.2024.025

摘要/Abstract

摘要： 为研究钢渣细骨料混凝土(steel slag fine aggregate concrete, SSC)在冲击荷载下的力学性能,利用直径为100 mm的分离式霍普金森压杆(split Hopkinson pressure bar, SHPB)对普通混凝土和钢渣细骨料混凝土(钢渣取代混凝土中河砂的体积分数分别为10%、20%和30%)进行轴向冲击压缩试验,研究钢渣体积分数及应变率对SSC的动态抗压强度、冲击韧性、动态增强因子(dynamic increase factor, DIF)F_di及破坏形态的影响,在Z-W-T方程的基础上修正,得到适用于钢渣混凝土的动态损伤本构方程。结果表明:SSC具有明显的应变率效应,即钢渣体积分数相同时,随着应变率的提高,SSC动态抗压强度、F_di、冲击韧性和破坏程度均逐渐增加;钢渣的掺入对混凝土在冲击荷载下的力学行为产生一定影响,在应变率相似时,钢渣体积分数从0增加到30%时,SSC动态抗压强度和冲击韧性呈上升趋势,但上升幅度相对较小;掺入钢渣后,F_di明显减小;通过对试验应力-应变曲线进行拟合可知,考虑损伤演化的Z-W-T方程可很好地描述SSC的动态应力-应变关系。

关键词: 混凝土, 钢渣混凝土, 分离式霍普金森压杆, 动态力学性能, 本构关系

Abstract: In order to study the mechanical properties of steel slag fine aggregate concrete(SSC)under impact loading, axial impact compression tests of ordinary concrete and steel slag fine aggregate concrete with 10%, 20%, and 30% volume replacement ratios were carried out by using the 100 mm split Hopkinson pressure bar(SHPB). The effects of steel slag replacement ratio and strain rate on the dynamic compressive strength, impact toughness, dynamic increase factor(DIF)F_di, and failure mode of SSC were investigated. Based on the Z-W-T equation, a modified dynamic damage constitutive equation suitable for steel slag concrete was obtained. The results showed that SSC had a significant strain rate effect, with the same amount of steel slag, the dynamic compressive strength, F_di, impact toughness, and failure severity of SSC gradually increased with the growth of strain rate. The mechanical behavior under impact loading was changed by the addition of steel slag. When the strain rate was similar, the dynamic compressive strength and impact toughness of SSC showed an upward trend when the steel slag content increased from 0 to 30%, but the increase was relatively small, while the F_di value significantly decreased after the addition of steel slag. By fitting the experimental stress-strain curve, it could be concluded that the Z-W-T equation considering damage evolution could effectively describe the dynamic stress-strain relationship of SSC.

Key words: concrete, steel slag concrete, split Hopkinson compression bar, dynamic mechanical properties, constitutive model

中图分类号:

TU528

薛刚,刘秋雨,董伟,李京军. 冲击荷载下钢渣细骨料混凝土力学特性及本构关系[J]. 山东大学学报 (工学版), 2025, 55(4): 108-117.

XUE Gang, LIU Qiuyu, DONG Wei, LI Jingjun. Mechanical properties and constitutive relationship of steel slag fine aggregate concrete under impact load[J]. Journal of Shandong University(Engineering Science), 2025, 55(4): 108-117.

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