风电机组混合塔筒转接结构的轴压性能试验

Experimental on the Axial Compressive Behavior of Adapters in the Hybrid Tower for Wind Turbine

对4个钢筋混凝土转接环缩尺试件进行轴压试验,得到转接环的典型破坏模态,并分析试件的荷载-变形关系和钢筋的应变发展规律,考察配筋率对试件承载性能的影响。研究结果表明:当配置了适量的底部环向钢筋时,转接环的破坏模式为延性破坏,表现为混凝土裂缝逐渐从底部向上发展,最终环向钢筋屈服、混凝土被压碎;当底部环向钢筋配筋率过高时,转接环容易发生脆性破坏;增加箍筋对提高试件承载力作用不大,但可改善试件的变形能力。

4 reinforced concrete adapter specimens are tested under axial compressive load. The typical failure modes of specimens are obtained and the load-deformation relations and the strain development are analyzed.Meanwhile, the effect of rebar ratio on the compressive behavior of specimens is investigated. The results show that:The failure of the adapter is ductile when appropriate amount of bottom circumferential reinforcement is deployed,the failure mode shows that the concrete cracks gradually develop from the bottom to the top, and finally the circumferential reinforcement yields and the concrete is crushed. When the reinforcement ratio of bottom circumferential reinforcement is too high, the adapter is prone to brittle failure. Increasing stirrups has little effect on increasing the bearing capacity of the specimen, but it can improve the deformation capacity of the specimen.