Damage mechanism analysis of concrete-filled steel tube (CFST) spherical joint wind turbine plane tower

钢管砼分体球型节点风电平面塔架的损伤分析

School of Civil Engineering, Inner Mongolia University of Science Technology, Baotou 014010, China

Received: 4 November 2022

Abstract

In order to investigate the failure modes and damage mechanism of the concrete filled steel tubular latticed planar wind turbine tower with split spherical joints under earthquakes, the low cyclic loading tests were carried out on the two plane towers with web wall thickness as parameters, and their hysteresis curves and skeleton curves were analyzed. At the same time, it is verified via ABAQUS finite element simulation, and based on this analysis, the parameter expansion analysis of the web diameter ratio was carried out. The results indicate that the failure characteristics of the tower include three types: weld tear failure, web member buckling failure and web member high-strength bolt pull-out failure; to increase the thickness of the web member can make the hysteresis curve of the tower fuller and the energy dissipation capacity stronger effectively. The ultimate bearing capacity and ductility coefficient of the tower are positively correlated with the diameter ratio of web members. When the diameter ratio of web members was greater than 0.13, the increase in ultimate bearing capacity and ductility coefficient reduced obviously. In order to maximize the overall mechanical performance of the tower and improve the economy, in practical engineering applications, the diameter ratio of the web member of such towers should be taken as the range of 0.11~0.13.

摘要

为研究钢管砼格构式分体球型节点风电平面塔架在地震作用下的破坏形态及损伤机理, 对二榀以腹杆壁厚为参数的平面塔架进行低周反复荷载试验, 分析其滞回曲线、骨架曲线等。同时通过ABAQUS有限元模拟对其进行验证对比, 并在此基础上对腹杆管径比进行参数拓展分析。结果表明: 塔架的破坏特征包括焊缝撕裂破坏、腹杆屈曲破坏和腹杆高强螺栓拉出破坏3种类型; 增加腹杆壁厚可使塔架的滞回曲线更加饱满, 耗能能力更强; 塔架的极限承载力和延性系数均与腹杆管径比呈正相关变化, 当腹杆管径比大于0.13时, 极限承载力和延性系数的增幅均明显下降。为最大程度发挥塔架整体的受力性能, 同时提高其经济性, 在实际工程应用中, 此类塔架的腹杆管径比宜取0.11~0.13。