输电钢管塔K型管板节点承载力试验及参数

Experimental Investigation and Parametric Studies on Ultimate Strength of K type TubeGusset Plate Connections in Transmission Towers

摘要:

为考察K型管板节点的受力性能，进行了4个大尺寸无偏心、负偏心K型管板节点的静力试验.结果表明，负偏心节点安全可靠，可用于实际工程；无偏心、负偏心两种节点的受力性能和破坏模式基本相同.同时，对试验加载过程进行了有限元非线性数值分析，研究了各主要参数对节点极限承载力的影响，并将分析结果与各国相关规范建议值进行了对比，提出了K型管板节点的极限承载力计算公式；并对主管轴力和肋板对节点极限承载力的影响进行了评价.

Abstract:

This paper presents results from experimental research and finite element method investigations on the ultimate strength of K type tubegusset plate connections with negative eccentricity or without eccentricity. Static tests on four large scale specimens indicate that connections with negative eccentricity and those without eccentricity have the similar failure modes and the connections with negative eccentricity are feasible in practice. Finite element models are employed to simulate the test loading procedure and to facilitate the parametric study on the ultimate strength of the connection. Based on a comparison between FEM results and assessment by existing design guides, a new ultimate strength equation is proposed to incorporate a reduction coefficient in terms of the chord stress effect. The effect of side stiffeners is also investigated to provide reference for application.