摘要
预应力钢管混凝土格构式风电塔架代替原有的钢-混凝土混合结构塔筒,四角柱采用预应力钢管混凝土,可增加刚度的同时减少钢材和混凝土的用量,方便运输和吊装。针对6个预应力钢管混凝土柱在轴拉荷载工况下的受力性能开展试验研究,主要考察的参数为含钢率、初始预应力及预应力筋与混凝土的接触方式。针对柱的破坏模式、荷载-位移曲线、钢管应变规律及延性等展开分析。结果表明:该型结构的典型轴拉破坏模式为钢绞线和外钢管的断裂,内钢管的断裂或塑性变形,以及混凝土的等间距分层开裂;初始预应力对钢管弹性变形影响较小,但其值越高,钢管屈服延后,试件伸长率更高;钢管含钢率越高,屈服时间越晚,承载力越大;黏结力可以推迟钢管的屈服时间,提高延性。
Our group proposes a new type of prestressed concrete-filled steel tubular lattice-type wind turbine tower to replace the original steel-concrete hybrid tower.The four corner columns are made of prestressed concrete-filled steel tube,which increases the stiffness while reducing the amount of steel and concrete,and facilitates transportation and lifting.An experimental study was carried out to investigate the mechanical properties of six prestressed concrete-filled steel tubular columns under axial tensile loads,with the main parameters being the steel ratio,the initial prestressing value and the contact mode between the prestressing tendons and the concrete.The results show that the typical axial tensile failure modes of this type of structure are the fracture of the strand and outer steel tubes,the fracture or plastic deformation of the inner steel tubes,and the equally spaced delamination cracking of the concrete;the initial prestressing value has less influence on the elastic deformation of the steel tubes,but the higher the value,the more delayed yielding of the steel tubes,and the higher the specimen elongation;the higher the steel ratio of the steel tubes,the later the yield time,and the higher the ultimate load-bearing capacity;the adhesion can delay the steel tubes’yielding time,improve the ductility.
作者
金开元
周绪红
王宇航
毛捷
JIN Kaiyuan;ZHOU Xuhong;WANG Yuhang;MAO Jie(College of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area of China Ministry of Education,Chongqing University,Chongqing 400045,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2024年第S01期114-123,共10页
Journal of Building Structures
基金
国家自然科学基金项目(52278144)
中央高校基本科研业务费专项(2022CDJQY-009)
重庆市研究生科研创新项目(CYB23058)
关键词
风电塔架
钢管混凝土
预应力
轴拉试验
受力性能
wind turbine tower
concrete-filled steel tube
prestressed structure
axial tension experiment
mechanical behavior
