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针对无侧向支撑的两跨人字形钢结构变电构架,进行了考虑结构二阶效应的受力性能分析。分析中考虑了构架柱的初始几何缺陷,加载过程分别考虑了几何非线性、材料非线性以及两种非线性因素共同存在对变电构架受力性能的影响。通过分析对比斜向、水平及竖向荷载作用下的二阶弹性、一阶弹塑性和二阶弹塑性3条荷载—位移曲线,得到了这种变电构架的二阶效应特点及影响因素:在斜向和水平荷载作用下,虽然受材料非线性的影响更大,但受到二阶效应的影响较早;在竖向荷载作用下,则受二阶效应的影响更大,而塑性效应的影响不很明显。
In view of the two-span herringbone steel structure substation without lateral support, the force performance analysis considering the second-order effect of structure is carried out. In the analysis, the initial geometrical defects of the frame column are considered. The loading process considers the influence of geometrical nonlinearity, material nonlinearity and coexistence of two nonlinear factors on the mechanical behavior of the substation. By analyzing three load-displacement curves of second-order elasticity, first-order elasto-plasticity and second-order elasto-plasticity under oblique, horizontal and vertical loads, the second-order effect characteristics and influencing factors of this kind of substation are obtained: Under the action of oblique and horizontal loads, although influenced by the material nonlinearity, it is affected by the second-order effect earlier and under the vertical load, the second-order effect is more affected, while the plastic effect The effect is not obvious.