Study On Mechanical Properties And Key Technologies Of Combined Fasting Sandwich Panels

Traditional large-span structures are mostly single-storey buildings that take up a lot of land resources.With the development of China's economy,land resources have been paid more and more attention.Guizhou Academy of Spatial Structure Research Center Ma Kejian academician developed a new combination of empty stomach sandwich plate structure,this structure not only solve the problem of land resources,and has a large column network,large room,flexible division of the building function.The lower rib of the U-shaped steel-concrete composite hollow sandwich plate is made of a combination of U-shaped steel and concrete,which allows the U-shaped steel to bear a greater tensile stress.In order to understand the static and dynamic performance of this new composite structure,the finite element method is used to study the structure,and the force analysis of the joint shear bond is done.In this paper,the finite element method is used to analyze the static and dynamic performance of the composite open-web sandwich plate structure.Studies have shown that structural deformations are similar to plates.Structural stiffness,dense spectrum distribution,was a step up.The lower rib U-shaped steel has a significant contribution to the vertical stiffness of the structure.Recommended surface sheet to take 60 ~100mm thick;Support beam should take the span of 1/14 ~ 1/23;Upper and lower ribs should take the grid size of 1/8 ~ 1/10;High span ratio desirable 1/20 ~ 1/25;Mesh size should not be greater than 2.5m,and to ensure that the number of structural mesh greater than 5;Increasing the boundary constraint of the structure can significantly improve the static and dynamic performance of the structure.In the structure of the comfort analysis should not be simplified as a point support,otherwise it will over estimate the frequency index.The finite element nodes are established,and the shear bond is analyzed.The high-strength bolts with the extension of the shear bond surface are larger.U-shaped steel in the shear bond junction should be used to strengthen the angle.Different aspect ratio shear key will affect the shear force of the force mode.The large shear force at the edge of the shear force should ensure its small aspect ratio,so that it has a higher bearing capacity.The bearing capacity expression of shear bond is given,and the force model of shear bond needs further study.