基于流固耦合理论的独立避雷针P-Δ效应分析

Analysis of P-Δeffect of independent lightning rod based on fluid-solid coupling theory

为了探究强风荷载作用下独立避雷针结构风致振动效应,采用2种分析方法,分别以风速和结构刚重比2个变量对独立避雷针结构位移进行参数化数值模拟。分析结果表明:在避雷针结构刚重比(风速)一定的前提下,2种分析方法所得结构顶点位移和P-Δ效应均与结构刚重比(风速)成正比;当结构刚重比大于30%或风速大于30 m/s时,结构P-Δ效应增大因子为1.04~1.40,并提出了类似独立避雷针高柔结构考虑P-Δ效应的适用前提和建议分析方法。

In order to explore the wind-induced vibration effect of independent lightning rod structure under strong wind load,two kinds of analysis methods were applied to simulate the displacement of independent lightning rod structure with the variables of the wind speed and structural stiffness-to-weight ratio,respectively.The analysis results show that based on the premise that the structural stiffness-to-weight ratio of the lightning rod(wind speed)is determined,the structural top displacement and P-Δeffect obtained by two analysis methods is proportional to the structural stiffness-to-weight ratio(wind speed).When the structural stiffness-to-weight ratio is greater than 30%or the wind speed is greater than 30 m/s,the P-Δeffect magnification factor of the structure is 1.04-1.40.The applicatory precondition and suggested analysis method for high-flexible structures like the independent lightning rod considering P-Δeffect are proposed.