钢管混凝土格构式风电平面塔架的行为参数分析

Study on Mechanical Behavior of Concrete Filled Steel Tubular Lattice for Wind Power Generation Plane Tower

关键词:  钢管混凝土  风电平面塔架  低周反复  管径比  壁厚比  ABAQUS有限元分析

Key words:  concrete filled steel tube  wind power generation plane tower  low cycle repeat  tube diameter ratio  wall thickness ratio  ABAQUS finite element analysis

摘要:

为了研究钢管混凝土格构式风电平面塔架在地震作用下的破坏机理和受力性能,对平面塔架进行了低周反复试验,对其滞回曲线、骨架曲线和刚度退化曲线进行了分析,采用Abaqus有限元软件进行验证并对参数管径比和壁厚比进行了拓展分析.结果表明：TJ 1和TJ 3破坏模式为强度破坏,TJ 2破坏模式为失稳破坏;较高管径比和壁厚比试件的滞回曲线面积更大,耗能能力更强;提高壁厚比可以有效提高试件承载能力和初始刚度,减缓试件刚度退化速度;管径比b≤042或壁厚比t≤125时,试件屈服位移、峰值荷载、极限位移增长速度较快,而在管径比b>042或壁厚比t>125时提高的幅度较小.

Abstract:

In order to study the failure mechanism and mechanical behavior of the concrete filled steel tubular lattice for wind power generation plane tower under earthquake action, the low cycle test was carried out on three planar towers, and its hysteresis curve, skeleton curve and stiffness degradation were analyzed. The curve was analyzed and the test was verified by ABAQUS finite element software and the parameter expansion analysis of tube diameter ratio and wall thickness ratio was carried out. The results show that the failure modes of TJ 1 and TJ 3 are strength failure, and the failure mode of TJ 2 is instability failure; the area of hysteresis curve of the specimen with higher tube diameter ratio and wall thickness is larger and energy consumption is large; Increasing the wall thickness ratio can effectively improve the bearing capacity and initial stiffness of the specimen and slow down the stiffness degradation rate of the specimen. According to the ABAQUS analysis, when the pipe diameter ratio b≤042 or the wall thickness ratio t≤125, the yield displacement, peak load and ultimate displacement increase faster, and the pipe diameter ratio b>042 or the wall thickness ratio t>125 the increase is less.