压缩空气下FRPC能源桩承载特性分析

Analysis of Bearing Capacity of FRPC Pipe as Energy Storage Medium under the Action of Compressed Air

可再生能源储存系统是利用钢筋混凝土桩基础来储存由太阳能板产生的可再生能源,可再生能源以压缩空气的形式储存在空心截面的桩基内,桩基础作为上部结构的承载结构,不仅要承受上部结构荷载,还要承受土体的反作用力和压缩空气的压力。然而,混凝土在拉应力作用下易产生裂缝,导致钢筋混凝土桩储存能源的使用性能和耐久性受限。为了克服传统钢筋混凝土能量桩的这些缺陷,针对各种FRP(Fiber Reinforced Polymer)-混凝土复合桩基础储能和承载的双功能进行研究。综合考虑结构荷载、土体的反作用和压缩空气热动力循环引起的内部空气压力的共同作用,对多种形式的复合能量桩基础体系的适用性进行了综合有限元分析。研究表明,内侧和外侧的FRP管可以有效提高使用性能和耐久性,相对于钢筋混凝土桩,FRPC管桩的使用可靠性和耐久性性能更高。

Renewable energy storage system uses reinforced concrete pile foundation to store renewable energy generated by solar panels.The renewable energy is stored in the hollow section of pile foundation in the form of compressed air.The pile foundation,acting as a load-bearing structure of the upper structure,sustains not only the upper structure load,but also the soil reaction force and the compressed air pressure.However,concrete is prone to cracking under tensile stress,which leads to the limitation of energy storage performance and durability of reinforced concrete piles.In order to overcome these defects of traditional reinforced concrete energy piles,this paper studies the dual functions of various FRP(Fiber Reinforced Polymer)-concrete composite pile foundations as energy storage and load bearing structures.Considering the combined action of structural load,soil reaction and internal air pressure caused by compressed air thermodynamic circulation,the applicability of multiple forms of composite energy pile foundation system is analyzed by the finite element method.The study shows that the inner and outer FRP pipes can effectively improve the service performance and durability of piles,and the service reliability and durability of FRPC pipe piles are improved compared with that of reinforced concrete piles.