钢筋混凝土长柱快速轴心受压试验与模拟研究
发布时间：2019-03-21 17:10
【摘要】：为了研究钢筋混凝土长柱在快速轴心受压加载下应变率和惯性效应对其性能的影响,开展了钢筋混凝土长柱快速轴心受压加载试验和动力有限元模拟研究。设计了两组共6根构件,长细比分别为12和22,快速加载试验中实测混凝土材料应变率达到10-3/s数量级。试验结果表明,与准静载相比,快速轴心受压下构件承载力及对应的轴向变形均有不同程度的提高,并且动力增大系数随长细比增大而增大。将CEB-FIB模式规范的混凝土材料动态应力-应变关系引入混凝土塑性损伤模型,在ABAQUS中建立了钢筋混凝土长柱快速轴心受压下力学性能分析的显式动力有限元模型,数值模拟结果与试验结果吻合良好。最后,运用所建立的有限元模型分析快速加载下构件承载力动力效应的形成机制。分析结果表明,构件长细比较小时其惯性效应可以忽略,动力增大系数可以主要由应变率效应来描述,随长细比增大,惯性效应对动力增大系数的贡献越来越明显,而应变率效应仍不可忽略。
[Abstract]:In order to study the effect of strain rate and inertia effect on the performance of long reinforced concrete columns under rapid axial compression, the rapid axial loading test and dynamic finite element simulation of long reinforced concrete columns were carried out. Two groups of six members with the slenderness ratio of 12 and 22 were designed. The strain rate of concrete materials measured in the rapid loading test reached the order of 10? 3? s. The experimental results show that compared with the quasi-static load, the bearing capacity and the corresponding axial deformation of the members under rapid axial compression are improved to some extent, and the dynamic increase coefficient increases with the increase of the slenderness ratio. The dynamic stress-strain relationship of concrete in CEB-FIB model is introduced into the plastic damage model of concrete. An explicit dynamic finite element model for the analysis of mechanical properties of long reinforced concrete columns under rapid axial compression is established in ABAQUS. The numerical simulation results are in good agreement with the experimental results. Finally, the finite element model is used to analyze the forming mechanism of the dynamic effect of the bearing capacity of the member under rapid loading. The results show that the inertia effect can be ignored and the dynamic increase coefficient can be described mainly by strain rate effect. With the increase of the slenderness ratio, the contribution of inertia effect to the dynamic increase coefficient becomes more and more obvious. The strain rate effect can not be ignored.
【作者单位】： 湖南大学土木工程学院;教育部建筑安全与节能重点实验室(湖南大学);
【基金】：国家自然科学基金重大研究计划重点项目(90715033);国家自然科学基金重大研究计划培育项目(91015007)
【分类号】：TU375.3
[Abstract]:In order to study the effect of strain rate and inertia effect on the performance of long reinforced concrete columns under rapid axial compression, the rapid axial loading test and dynamic finite element simulation of long reinforced concrete columns were carried out. Two groups of six members with the slenderness ratio of 12 and 22 were designed. The strain rate of concrete materials measured in the rapid loading test reached the order of 10? 3? s. The experimental results show that compared with the quasi-static load, the bearing capacity and the corresponding axial deformation of the members under rapid axial compression are improved to some extent, and the dynamic increase coefficient increases with the increase of the slenderness ratio. The dynamic stress-strain relationship of concrete in CEB-FIB model is introduced into the plastic damage model of concrete. An explicit dynamic finite element model for the analysis of mechanical properties of long reinforced concrete columns under rapid axial compression is established in ABAQUS. The numerical simulation results are in good agreement with the experimental results. Finally, the finite element model is used to analyze the forming mechanism of the dynamic effect of the bearing capacity of the member under rapid loading. The results show that the inertia effect can be ignored and the dynamic increase coefficient can be described mainly by strain rate effect. With the increase of the slenderness ratio, the contribution of inertia effect to the dynamic increase coefficient becomes more and more obvious. The strain rate effect can not be ignored.
【作者单位】： 湖南大学土木工程学院;教育部建筑安全与节能重点实验室(湖南大学);
【基金】：国家自然科学基金重大研究计划重点项目(90715033);国家自然科学基金重大研究计划培育项目(91015007)
【分类号】：TU375.3
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