基于多尺度模型的斜交相贯节点基本力学性能分析

Analysis of basic mechanical properties of intersecting connection based on multi-scale model

斜交网格结构是一种性能优良的新型结构体系,斜柱相交的节点是保证结构安全的关键部位,也是目前研究的重点.基于所提出本构方程,建立关于钢管混凝土斜交网格相贯节点的多尺度有限元建模方法,对节点构件进行算例分析,结果表明此多尺度模型与实体模型模拟结果相似,可以很好地模拟实际构件,大大降低了计算量.基于提出的方钢管混凝土斜交网格相贯节点多尺度有限元模型,对单调荷载作用下的约束参数进行了分析,建议实际工程应用中约束系数ξ取值控制在3.0以上.设置中心节点板、环向加强版、衬板是一种必要的构造措施,建议取值在1倍钢管壁厚.

Diagrid structural system is an innovative structural system,which has good mechanical performance,and the key part of it to ensure structural safety is node which is oblique crossed by diagonal column.The node is also the focus of research.Based on constitutive relationship in this paper,multi-scale finite element modeling method of intersecting concrete filled steel tube(CFST)node in diagrid structure is proposed and compared with the test.Result shows that the multi-scale model generally agree closely with the entity model and can be a good simulation of the actual component.It can reduce the amount of calculation by using multi-scale model.Based on multi-scale model of intersecting square CFST node in diagrid structure,constrained coefficient under monotonic loading are analyzed.It is suggested that the value of constrained coefficientξin practical engineering be controlled above 3.0.Setting center connecting plate,reinforcement ring plate and lining plate is a necessary structural measure,and it is recommended to take the value of 1 times of the wall thickness of steel pipe.