| Because of the self-weight of concrete,under the same stress,the steel structure has small self-weight,so the three-sided supporting long-span structure is basically a grid structure.However,under the same stress,the hollow sandwich slab greatly reduces the self-weight of the structure compared with the solid slab.Based on this,Professor Mark Jian proposed the three-sided long-span concrete hollow sandwich slab column structure.The structure can be used in maintenance hangar,ship docking point and other specific needs of the structure.This paper introduces the structural forms,advantages and disadvantages of several common long-span buildings as well as the research status and practical engineering application of hollow sandwich plate..The second chapter introduces the mechanical analysis method of hollow sandwich plate,and deduces the calculation formula of double layer shear bond double layer hollow beam and other solid beam and the calculation formula of axial force and shear force of upper,middle and lower ribs according to the equal generation stiffness method.In Chapter 3,the static properties of double-layer shear keys and single-layer shear keys used in the opening edge of three-sided supported hollow sandwich plate column structure and the influence of each component parameter on the maximum deflection of the structure are analyzed.The results show that double-layer shear keys used in the opening edge of three-sided supported hollow sandwich plate column structure are more rigid than single-layer shear keys,and the force is more uniform.In Chapter 4,the first twelve order vibration modes of the three-sided supported large-span hollow sandwich slab floor are studied,and the influence of component parameters on the first twelve order natural vibration frequencies and fundamental frequencies of the structure is studied.The results show that the thickness of the surface thin plate,the height of the rib section and the height of the shear key have a great influence on the natural vibration frequencies of the structure,and the thickness of the surface thin plate has the greatest influence on the fundamental frequencies of the structure.It is recommended that the thickness of the surface sheet should be 1/35 of the mesh size.In Chapter 5,fixed-point excitation method and route method are used to analyze the comfort level of the three-sided supported large-span hollow sandwich floor.The vertical natural vibration frequency and peak acceleration of the floor meet the standard requirements.The peak acceleration of the fixed-point excitation method is greater than that of the route method,so the fixed-point excitation method is preferred when calculating the actual engineering comfort.In the sixth chapter,the reinforcement calculation is carried out based on the example of the proposed project,aiming at providing guidance for the future engineering application.The results show that the three-sided supported large-span concrete hollow sandwich plate column structure has good mechanical properties and can be applied to engineering practice. |
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