考虑应变率效应的钢筋混凝土框架节点抗震性能试验研究

发布时间：2018-05-03 17:22

本文选题：钢筋混凝土框架节点 + 应变率　；参考：《建筑结构学报》2014年02期

【摘要】：通过对钢筋混凝土框架梁柱节点组合体抗震性能试验,研究加载速度对节点组合体承载力和破坏形态的影响规律。研究结果表明:梁端位移加载速率分别为0.4、4、40 mm/s时,节点核心区的应变率数量级分别为10-5、10-4和10-2;随着加载速率的提高,节点组合体破坏更为严重,裂缝分布更为集中;相对拟静态加载试验,快速加载时节点组合体在破坏前的耗能增加;加载速率的提高对节点组合体屈服荷载的影响不明显,但是极限荷载稍有增大,而极限荷载后的节点组合体承载能力和刚度退化较快;快速加载时,在本文所采用的轴压比范围内,其变化对节点组合体的承载力影响不大,然而随着轴压比的提高,核心区混凝土的裂缝宽度逐渐减小;将材料动态强度直接应用于拟静态计算模型得到的节点受剪承载力高于试验结果,表明这种直接计算方法偏于不安全。
[Abstract]:The effect of loading speed on the bearing capacity and failure pattern of Liang Zhu joint composite of reinforced concrete frame was studied. The results show that the strain rate of the core region is 10 ~ (-5) ~ 10 ~ (-4) and 10 ~ (-2), respectively, when the loading rate of the beam end displacement is 0.4 ~ (4) mm/s, respectively, and with the increase of the loading rate, the damage of the joint is more serious and the distribution of cracks is more concentrated. Compared with the quasi-static loading test, the energy consumption of the node assembly before failure increases under rapid loading, and the effect of the loading rate on the yield load of the node assembly is not obvious, but the ultimate load increases slightly. However, the bearing capacity and stiffness of the joint assembly degenerate rapidly after the ultimate load, and in the range of axial compression ratio adopted in this paper, the change of the bearing capacity has little effect on the bearing capacity of the joint assembly, however, with the increase of axial compression ratio, The crack width of concrete in the core area decreases gradually, and the shear capacity of the joints obtained by applying the material dynamic strength directly to the quasi-static model is higher than that of the test results, which indicates that the direct calculation method is not safe.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金重大研究计划重点项目(90815026)
【分类号】：TU375.4;TU352.11

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