【摘要】 为了合理地描述锈蚀钢框架的地震破坏形式及不同程度的锈蚀对钢框架抗震性能的影响,在欧进萍等人提出的钢结构地震损伤模型的基础上建立锈蚀钢结构地震损伤模型。为确定锈蚀钢结构地震损伤模型参数,分别给出锈蚀梁、柱构件双线性恢复力模型特征点的计算方法,并通过弹塑性时程分析获得损伤模型中的其他参数数值。利用加权系数法合理地考虑锈蚀构件损伤向整体结构损伤迁移转化的多尺度效应,建立锈蚀钢框架整体地震损伤模型。结合该损伤模型的特点,定义了对应结构不同破坏等级的损伤指数范围。最后,对5榀具有不同锈蚀率的平面钢框架结构进行了弹塑性时程分析,结果表明:所建的损伤模型能在一定程度上反映钢框架结构随锈蚀程度的退化规律。更多还原

【Abstract】 In order to reasonably describe the seismic damage forms of a corroded steel frame and the effects of different levels of corrosion on the aseismic performance of steel frames,on the basis of the seismic damage model of steel structures proposed by Ou Jinping,et al,the seismic damage model of a corroded steel frame was built. To determine the seismic damage model parameters of a corroded steel structure,the calculation methods of the bilinear restoring force model feature points of corroded beams and columns member were presented,and other parameter values were obtained with elastic-plastic time history analysis. Using the weighted partial coefficients method,the multi-scale effect of migration and conversion from member damage to structure damage was considered,the overall seismic damage model of a corroded steel frame was established. Combined with the characteristics of the damage model proposed here,the corresponding structural damage index ranges with different damage levels were defined. Finally,the elastic-plastic time history analyses were performed for 5 specimens of flat steel frame structures with different corrosion rates,the results showed that the damage model proposed here can reflect the degradation law of steel frame structures with variation of corrosion level in a certain extent.更多还原