橡胶集料自密实混凝土的统计损伤本构关系

发布时间：2018-06-19 17:53

本文选题：橡胶集料自密实混凝土 + 掺量　；参考：《四川大学学报(工程科学版)》2014年04期

【摘要】：为研究橡胶集料对橡胶集料自密实混凝土(RSCC)力学性能的影响,并建立相应的本构预测模型,对RSCC进行了压缩应力-应变试验。试验结果表明:随着橡胶掺量的增加,RSCC的抗压强度降低,变形能力增强,韧性增大。根据RSCC的微元强度服从随机分布的特点,以米塞斯强度准则定义RSCC的微元强度,以对数正态分布表征RSCC的微元强度的分布模型,并考虑模型参数与橡胶掺量的关系,建立了以橡胶掺量为变化因素的RSCC的统计损伤本构关系,拟合效果十分理想,拟合曲线与试验曲线的相关系数随橡胶掺量的增加而增大,最大值为0.989 1。该模型形式简单,参数少且计算简便,能够有效体现RSCC在不同橡胶掺量下的韧脆性转化特征。最后研究了RSCC的损伤演化过程。随着应变的增加,RSCC的损伤演化曲线呈S形,单调递增,终值趋近于1,橡胶掺量的增加延缓了RSCC初始损伤的发展;损伤的发展速率随应变的增加先增大后减小,在峰值应变附近达到最大值,橡胶掺量的变化对损伤发展速率的最大值没有影响。
[Abstract]:In order to study the effect of rubber aggregate on the mechanical properties of rubber aggregate self-compacting concrete (RSCC) and establish the corresponding constitutive prediction model, the compression stress-strain test of RSCC was carried out. The results show that with the increase of rubber content, the compressive strength of RSCC decreases, the deformation ability increases and the toughness increases. According to the characteristics of random distribution of RSCC's microelement strength, the microelement strength of RSCC is defined by Mises strength criterion, and the distribution model of RSCC's microelement strength is characterized by logarithmic normal distribution, and the relationship between model parameters and rubber content is considered. The statistical damage constitutive relation of RSCC with rubber content as the variable factor was established. The fitting effect was very ideal. The correlation coefficient between the fitting curve and the test curve increased with the increase of rubber content, and the maximum value was 0.989. The model is simple in form, few in parameters and simple in calculation. It can effectively reflect the ductile and brittle transformation characteristics of RSCC under different rubber content. Finally, the damage evolution process of RSCC is studied. With the increase of strain, the damage evolution curve of RSCC is S shape, monotonously increasing, the final value is approaching to 1, the increase of rubber content delays the development of initial damage of RSCC, and the development rate of damage increases first and then decreases with the increase of strain. The maximum value was reached near the peak strain, but the change of rubber content had no effect on the maximum damage development rate.
【作者单位】：中南大学土木工程学院;中国水电顾问集团华东勘测设计研究院;
【基金】：国家“973”重点基础研究发展计划资助项目(2013CB036200) 国家自然科学基金资助项目(51178467)
【分类号】：TU528

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