摘要
目的研究复式钢管混凝土柱(CFST)与钢梁连接空间节点的抗震性能,为复式钢管混凝土结构空间节点的后续研究与应用提供参考.方法运用有限元模拟软件ABAQUS建立了外加强环式复式钢管混凝土柱与H型钢梁节点的空间模型,通过选取计算单元、设定接触关系、施加载荷等一系列建模过程,建立了3种不同参数下的6个模型,考察不同加载方式、不同混凝土强度等级及核心混凝土的存在对空间节点的抗震性能的影响.结果空间双向加载制度2对空间节点的承载力、刚度、变形性能和耗能性能影响较大,与平面加载方式相比,承载力下降了14.3%,累积耗能降低15%,刚度退化明显;随着混凝土强度等级的提高,节点的承载力越高,混凝土强度等级的变化对刚度退化影响越不明显;核心混凝土的存在有效地提高了节点承载力,延缓了节点刚度的退化速度.结论实心高强复式钢管混凝土柱与钢梁空间节点在双向加载作用下的抗震性能较平面节点试件的抗震性能要差,应加强空间节点抗震试验方法的研究.
To provide a reference for application of 3D joints between composite concrete filled steel tube（CFST） column and steel beam, seismic behavior of these joints was studied in this pa per. Taking into account of selecting different elements,contacts and loads, six 3D models with three different parameters for joints between CFST column and steel beam were built using the fi nite element software ABAQUS. Effects of different loading, concrete strength and core concrete on the seismic behavior of 3D joints were studied. It is found that the bidirectional loading regime 2 has great influence on the bearing capacity, stiffness, deformation and energy dissipation of the joints. Comoared with olane loading, the bearing capacity and cumulative hvsteretic enemy decrease about 14.3% and 15%. With increase of concrete strength, the bearing capacity increases. But the stiffness degradation has no significant change. The existence of core concrete effectively improves the bearing capacity of the 3D joints and defers the stiffness degradation velocity. Con clusion is that the seismic behavior of 3D joints between CFST column and steel beam by bidirec tional loadine is worse than olane ioints. Seismic tests for 3D Joints should be strengthened.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2015年第1期27-37,共11页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(90815020)
辽宁省教育厅科学研究项目(LS2010131)
