双层板填充液体结构的抗压性能研究

Research on compressive performance of the double-layer plate filled liquid structure

为了提高双层板结构的抗压性能,提出一种双层板填充液体结构,采用简化理论法和有限元法对双层板填充液体结构进行抗压性能分析,并与双层板加筋结构进行比较,结果表明,双层板填充液体结构的抗压性能高于双层板加筋结构,并且对下层板的压力传递系数会随着液体体积模量的增大而逐渐增大;随着液体体积模量K的增加,上、下层板最大弯曲应力向相反的方向变化,且液体体积模量K在(180~300)×102 MPa范围内取值时,对上、下板的承压状态较为有利;双层板加筋结构承压时会出现较大的应力集中现象,不利于结构的承压,而双层板填充液体结构液体受压均匀变形,增加了下层板结构的材料利用率,从而提高整体结构的抗压性能;考虑到结构的规模和经济性,采用材料利用率这一指标进行衡量,当填充液体厚度在150~250 mm范围内取值时,能有效提高整体结构的抗压性能。

In order to improve the compressive performance of the double-layer plate structure,a double-layer plate filled liquid structure is proposed.The compressive performance of the double-layer plate filled liquid structure was analyzed by simplified theory and finite element method.The results showed that,the compressive performance of the doublelayer plate filled liquid structure is higher than that of the double-layer plate reinforced structure,and the pressure transfer coefficient of the lower plate will increase with the increase of the liquid bulk modulus.As the liquid bulk modulus K increases,the maximum bending stress of the upper plates evolves in the opposite direction compared with that of the lower plates.When the liquid bulk modulus K is in the range of (180-300)×10^2MPa,the compressive performance of the upper and lower plates is more favorable.The larger stress concentration will appear when plate reinforced structure is under pres- sure,which is not conducive for the structure bearing the pressure.And double-layer plate filled liquid structure deforms uniformly when under pressure,which increases the material utilization of lower plate structure,and the compression performance of the overall structure can thus be improved.When the proportion and economy saving of the structure are both taken into account and the indicator of the material utilization is used for measurement,the compression performance of the overall structure can be improved with the filling liquid thickness failing into the range of 150-200mm value.