钢框架焊接节点地震损伤模型研究

Study on seismic damage model of steel frame welded connections

结合国内外发表的试验结果,综合考虑加载方式、加载路径、循环次数的影响,并考虑钢结构试件在循环荷载作用下刚度和屈服位移随着循环次数的增加不断降低的影响,提出一种新的双参数地震损伤模型来正确评价损伤累积效应对结构的影响并准确预测结构的破坏形态。将提出的新的损伤模型及其计算结果与其他学者提出的地震损伤模型及有关文献提出的损伤指数抗震设防目标相比较,验证了新模型的合理性和科学性,并提出了与新的损伤模型相对应的设防目标指数范围。

Combined with the experimental results published at home and abroad,a new form of dual parameter seismic damage model was put forward,which considered the influence of loading mode,loading path and cyclic times. The reduction of yield displacement and the stiffness of steel members along with the increase of cyclic times under the cyclic loading was also considered in this new model to assess the influence of damage accumulation effect on the structure and predict failure patterns of the structure. The proposed model and relevant calculation results were compared with current damage models and damage index seismic fortification goals of relevant literatures so that its rationality and scientifically could be reflected. The fortification goal index range corresponding to the new damage model was put forward.