基于能量平衡规律研究低层钢框架结构损伤分布机理

发布时间：2018-08-01 10:33

【摘要】：针对低层钢框架损伤分布机理不明确,以钢框架的强柱系数、柱脚形式及首层剪重比为主要研究参量,建立16个典型低层钢框架模型;通过强震作用下的弹塑性时程分析,基于能量平衡原理研究低层钢框架楼层以及构件的损伤分布机理.研究结果表明:罕遇地震输入能量的80%以上靠钢框架构件塑性变形来吸收;低层钢框架首层变形集中,为防止首层破坏,柱脚刚接时强柱系数要求1.7以上,柱脚铰接时,建议强柱系数大于2.当强柱系数大于3时,各层层间位移分布基本均匀,然而刚接梁地震需求性能增大,在设计中对梁高的控制及梁柱节点连接的工艺要求较高.
[Abstract]:In view of the uncertainty of damage distribution mechanism of low-rise steel frame, 16 typical low-story steel frame models are established by taking the coefficient of strong column, the form of column foot and the shear weight ratio of the first story as the main research parameters, and the elastic-plastic time-history analysis under the action of strong earthquake is carried out. Based on the principle of energy balance, the damage distribution mechanism of low story steel frame floor and members is studied. The results show that more than 80% of the input energy from rare earthquakes is absorbed by plastic deformation of steel frame members, and the deformation concentration of the first layer of low steel frame is concentrated. In order to prevent the damage of the first layer, the coefficient of strong columns should be more than 1.7 when the column foot is rigidly connected, and when the column foot is hinged, It is suggested that the coefficient of strong column is greater than 2. When the coefficient of strong column is greater than 3, the displacement distribution between layers is basically uniform. However, the seismic demand of rigid-connected beam increases, and the control of beam height and the process of connection of Liang Zhu joints are required in the design.
【作者单位】：桂林理工大学广西岩土力学与工程重点实验室;
【基金】：国家自然科学基金项目(51409051,51368014) 广西自然科学基金项目(2014GXNSFBA118256) 广西矿冶与环境科学试验中心资助项目(KH2012YB027)
【分类号】：TU391

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