竖向荷载作用下部分框支剪力墙结构转换层梁柱受力性能分析

Analysis on beam-column mechanical behavior for part of the transfer layer of frame-supported shear wall structure under vertical load

针对部分框支剪力墙结构转换层受力变形复杂,使用常规设计分析软件无法准确进行模拟分析这一问题,以有限元软件ABAQUS为平台,对铜仁市某部分框支剪力墙结构转换梁与上部剪力墙不同转换方式,分别建立三种实体单元有限元模型进行分析,并得到关键构件应力分布规律。表明,转换梁柱连接节点部位、转换梁与上部墙肢边缘接触部位、转换梁跨中等部位在竖向荷载作用下应力集中现象明显为受力薄弱部位;转换梁上部墙肢偏心布置易引起转换梁两侧应力集中削弱其承载能力,设计中应避免;转换边柱与转换梁连接部位更不易实现"强柱弱梁"机制;对墙肢使用二次转换设计时会在转换梁连接部位造成应力集中削弱转换梁的承载能力,设计中应避免。并且将ABAQUS分析结果与常规设计软件YJK进行分析对比,结果表明,对复杂高层建筑中关键构件进行实体单元精细化分析有必要,且能保证设计合理安全。

For part of the frame supported shear wall structure transformation layer stress deformation complex,using conventional design and analysis software cannot be accurately simulated analysis of the problem,based on finite element software ABAQUS platform,based on finite element analysis method for part including frame shear wall structure transformation layer transfer beam and upper shear wall of different relations and transformation way to establish three finite element models for analysis of the key component and get the stress distribution rule.The results show that the stress concentration at the connecting joint of the beam and column,the contact between the edge of the transfer beam and the upper wall limb,and the mid-span part of the transfer beam under vertical load are obviously weak parts.The eccentric arrangement of upper wall limbs of the transfer beam can easily lead to stress concentration on both sides of the transfer beam,which should be avoided in the design.It is more difficult to realize the mechanism of"strong column and weak beam"at the connecting part of conversion side column and side beam.When secondary conversion beam will weaken the bearing capacity of the conversion beam,which should be avoided design software(YJK),and the results showed that it was necessary to carry out detailed analysis of physical units of key components in complex high-rise buildings,and the design could be reasonable and safe.