平面KT型圆钢管搭接节点有限元参数分析与承载力公式研究

摘要:

采用有限元软件,合理选用边界条件、加载方式、单元形状与类型、材料以及几何非线性等建立有限元模型,以试验结果[1]为基础,验证了模型的可靠性。参数化分析结果表明,被搭接支管受压时,其隐蔽部分是否焊接对节点承载力影响不大,被搭接支管受拉时,隐蔽部分是否焊接对节点承载力有较大影响。几何参数β(支管主管直径比)、γ(主管径厚比)对平面KT型圆钢管搭接节点承载力有显著影响,且β、γ两者对节点承载力也相互影响。γ较小时,τ对节点承载力有显著影响,γ较大时,τ对节点承载力影响不大。搭接率Ov对节点承载力影响不显著。利用多元线性回归分析技术,对有限元参数化分析结果进行回归分析,得到平面KT型圆钢管搭接节点承载力参数公式,最后,从适用性、安全性、连续性等方面验证了参数公式的可靠性。

Abstract:

The paper establishes the finite element model considering applicable boundarySconditions, loading mode, element shape and type, material and geometrical nonlinearity, etc, with ANSYS and ensure it reliable based on the test results[]. The parametric analysis shows that welding or the absence of the hidden weld has little influence on the bearing capacity of unstiffened uniplanar overlapped CHS KT-joints when the overlapped brace is under pressure, while, it make a great difference when the overlapped brace is in tension. Parameter β(Diameter ratio of brace versus chord ) and γ(half diameter to thickness ratio of chord) have significant effect on the bearing capacity of KT joints, while τ (brace to chord thickness ratio) and Ov (overlap ratio) has little effect on the maximum load carrying capacity. The paper adopts methodsSofSmultivariateSlinearSregression to get the last parametric equation. In the end, the paper verifies the reliable, applicability.