裂缝对寒冷地区水面光伏支架PHC管桩力学性能影响

采用Abaqus数值模拟方法研究冻胀力作用下预应力高强度混凝土(Prestressed High-Strength Concrete,PHC)管桩开裂状态、纵向开裂时管桩的性能退化情况和极端风载荷作用下管桩的承载能力。研究发现:在无钢筋锈蚀的情况下混凝土裂缝对管桩整体弹性模量影响较小;开裂后的管桩在极端风载荷作用下裂纹尖端会有应力集中现象出现,但整体稳定性与未开裂的管桩相差不大。研究内容为保障冷湿环境下PHC管桩的正常运行提供一定的理论参考。

Effect of Cracks on Mechanical Properties of PHC Pipe Pile for Water Surface Photovoltaic Support in Cold Areas

Abaqus numerical simulation method is used to study the cracking state of the Prestressed High-Strength Concrete(PHC)pipe pile under the action of frost heave force,the performance degradation of the pipe pile during longitudinal cracking and the bearing capacity of the pipe pile under extreme wind loads.The results show that:the concrete cracks have little effect on the overall elastic modulus of the pipe pile in the case of no steel corrosion;the cracked pipe pile has stress concentration at the crack tip under extreme wind load,but the overall stability is not much different from that of the uncracked pipe pile.The research provides certain theoretical reference for ensuring the normal operation of PHC pipe piles in cold and humid environments.