钢筋钢纤维混凝土梁柱节点损伤特性及其计算方法

发布时间：2018-06-28 02:05

本文选题：梁柱节点 + 钢纤维混凝土　；参考：《建筑结构学报》2017年11期

【摘要】：基于低周反复加载试验结果,研究钢筋钢纤维混凝土梁柱节点损伤演化特性。将变形与累积能量耗散指标相结合,建立反复荷载作用下钢筋钢纤维混凝土梁柱节点损伤的计算模型,分析影响钢筋钢纤维混凝土梁柱节点损伤的因素。结果表明:核心区钢纤维体积率、配箍率和轴压比是影响钢筋钢纤维混凝土梁柱节点损伤性能的主要因素;在相同的加载次数下,随钢纤维体积率、配箍率和轴压比的增大,梁柱节点损伤有所减小;其他影响因素相同的条件下,钢纤维体积率为1.0%和1.5%梁柱节点损伤曲线在破坏时的斜率较钢纤维体积率为0.5%的梁柱节点分别减小了21.6%和34.7%;配箍率为0.6%和1.2%的梁柱节点损伤曲线在破坏时的斜率较配箍率为0的梁柱节点分别减小了36.9%和59.4%;轴压比为0.3和0.4的梁柱节点损伤曲线在破坏时的斜率较轴压比为0.2的梁柱节点分别减小了12.5%和17.1%;所建立的反复荷载作用下钢筋钢纤维混凝土梁柱节点损伤计算模型,能够较好反映梁柱节点损伤演化的特点,可用于描述此类节点的损伤演化过程。
[Abstract]:The damage evolution characteristics of steel fiber reinforced concrete (SFRC) Liang Zhu joints were studied based on the low cycle cyclic loading test results. Combining deformation with cumulative energy dissipation index, the damage calculation model of steel fiber reinforced concrete (SFRC) Liang Zhu joints under repeated loading is established, and the factors affecting the damage of SFRC Liang Zhu joints are analyzed. The results show that the steel fiber volume ratio, hoop ratio and axial compression ratio in the core region are the main factors affecting the damage performance of steel fiber reinforced concrete (SFRC) Liang Zhu joints, and under the same loading times, with the increase of the steel fiber volume ratio, hoop ratio and axial compression ratio, The damage of Liang Zhu nodes was reduced, and other factors were the same. The slope of damage curve of Liang Zhu joints with 1.0% and 1.5% steel fiber volume ratio decreased by 21.6% and 34.7%, respectively, and the slope of damage curve of Liang Zhu joints with 0.6% and 1.2% hoop ratio decreased by 21.6% and 34.7%, respectively, and the slope of damage curve of Liang Zhu joints with 0.6% and 1.2% hoop ratio was decreased by 21.6% and 34.7%, respectively, when the steel fiber volume ratio was 0.5%. The damage curves of Liang Zhu joints with axial compression ratio of 0.3 and 0.4 are decreased by 12.5% and 17.1%, respectively, and the slope of damage curves of Liang Zhu joints with axial compression ratio of 0.3 and 0.4 are decreased by 12.5% and 17.1%, respectively, compared with those of Liang Zhu joints with axial compression ratio of 0.2. The damage calculation model of steel fiber reinforced concrete (SFRC) Liang Zhu joint is used. It can well reflect the characteristics of damage evolution of Liang Zhu nodes and can be used to describe the damage evolution process of such nodes.
【作者单位】：郑州大学土木工程学院;河南工程学院土木工程学院;郑州航空工业管理学院土木建筑工程学院;
【基金】：国家自然科学基金项目(50678159)
【分类号】：TU37

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