西安建筑科技大学学报(自然科学版)

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 coefficient ξ in 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.

引言
1 模型的建立
2 材料本构模型的选取
3 多尺度有限元模型算例验证取
4 相贯节点性能影响参数分析
5 结论

图1 斜交网格节点构造<br/>Fig.1 Joint of diagrid structure

图1 斜交网格节点构造
Fig.1 Joint of diagrid structure

图2 多尺度模型耦合示意图<br/>Fig.2 Multi-scale model coupling diagram

图2 多尺度模型耦合示意图
Fig.2 Multi-scale model coupling diagram

图3 有限元多尺度模型<br/>Fig.3 Finite element multi-scale model

图3 有限元多尺度模型
Fig.3 Finite element multi-scale model

图4 钢材应力-应变曲线<br/>Fig.4 Stress-strain curve of steel

图4 钢材应力-应变曲线
Fig.4 Stress-strain curve of steel

图5 试件A-3 Von mises应力云图<br/>Fig.5 Von mises stress nephogram of specimen A-3

图5 试件A-3 Von mises应力云图
Fig.5 Von mises stress nephogram of specimen A-3

图6 试验结果与计算结果曲线对比<br/>Fig.6 Comparison between calculation and test results

图6 试验结果与计算结果曲线对比
Fig.6 Comparison between calculation and test results

图7 节点的荷载-位移曲线对比<br/>Fig.7 Comparison of load-displacement curves of node

图7 节点的荷载-位移曲线对比
Fig.7 Comparison of load-displacement curves of node

图8 实体模型与多尺度模型应力云图对比<br/>Fig.8 Comparison of stress nephogram between multi-scake model and entity model

图8 实体模型与多尺度模型应力云图对比
Fig.8 Comparison of stress nephogram between multi-scake model and entity model

图9 不同斜交角度下的荷载-位移曲线<br/>Fig.9 Load-displacement curves of different skew angles

图9 不同斜交角度下的荷载-位移曲线
Fig.9 Load-displacement curves of different skew angles

图10 约束系数相关参数对节点的影响<br/>Fig.10 The influence of the related parameters of the constraint coefficient

图10 约束系数相关参数对节点的影响
Fig.10 The influence of the related parameters of the constraint coefficient

图11 中心连接板与承载力关系图<br/>Fig.11 Relationship between center connecting plate and bearing capacity

图11 中心连接板与承载力关系图
Fig.11 Relationship between center connecting plate and bearing capacity

图12 中心连接板的轴向和环向应力云图<br/>Fig.12 Axial and circumferential stress nephogram of central connecting plate

图12 中心连接板的轴向和环向应力云图
Fig.12 Axial and circumferential stress nephogram of central connecting plate

图13 衬板对节点区承载力的影响<br/>Fig.13 Influence of lining plate on bearing capacity of joint area

图13 衬板对节点区承载力的影响
Fig.13 Influence of lining plate on bearing capacity of joint area

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备注

引言

1 模型的建立

2 材料本构模型的选取

3 多尺度有限元模型算例验证取

4 相贯节点性能影响参数分析

5 结论

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