论文部分内容阅读
以输电塔结构的可靠度、敏感性及相关性为研究重点,从其最大变形与能量角度出发,量化了不同水平荷载作用下各随机变量对最大变形与应变能的敏感程度,明确了影响二者最为显著的随机变量,理清了最大变形与总应变能之间的相关程度。研究表明:当荷载水平较低时,除荷载外,二者对中底部竖向杆件的弹性模量、肢长和肢厚最为敏感;当荷载水平较高、输电塔塑性发展较充分时,提高中部竖向杆件屈服强度的均值、减小其标准差可有效地降低输电塔的最大变形、减小其倒塌破坏的概率;输电塔的最大变形和应变能存在强相关性,可通过荷载-应变能曲线作为该类结构是否发生失效的判据;随着荷载水平的增加,最大挠度和总应变能的均值持续增加,标准差和变异性亦逐渐增加。
Taking the reliability, sensitivity and relativity of transmission tower structure as the research focus, from the viewpoint of maximum deformation and energy, the sensitivity of each random variable to the maximum deformation and strain energy under different horizontal loads is quantified, The most significant random variables, clear the relationship between the maximum deformation and total strain energy. The results show that when the load level is low, the elastic modulus, limb length and limb thickness are the most sensitive when the load level is low except for the load. When the load level is high and the plasticity of the transmission tower is more developed, Increase the mean value of the yield strength of the vertical bar in the middle and reduce the standard deviation can effectively reduce the maximum deformation of the transmission tower and reduce the probability of its collapsing and destruction; the maximum deformation and the strain energy of the transmission tower have a strong correlation, - the strain energy curve as a criterion for the failure of such structures; as the load level increases, the mean maximum deflection and total strain energy continue to increase, and the standard deviation and variability also gradually increase.