The Optimization Analysis Of Cast-in-situ Concrete-filled Column Hollow Floor System

Based on the concept of'equivalent stiffness'and'equivalent area', the 'similar H'cross-section is equivalent to the actual hollow floor system along the direction that is perpendicular to the hole. Based on the proposed model, the actual hollow floor system,'H'cross-section model and'similar H'cross-section model are compared with each other from the one-dimensional beam structure, so that it is to validate the reasonableness of the equivalent cross-section. There exists a wide error that the truss model is equivalent to the hollow floor system.The stress response and displacement response of three kinds of different situ concrete hollow floor models are analyzed with the vertical load and horizontal load.With the vertical load and its gravity, the upper surface of the hollow floor system shrinks and the lower surface of the hollow floor system expands along the x and z directions. It is presented the'bowl'deformation along the vertical direction. The system's maximum tensile stresses have appeared in boundaries, and obviously, the stress concentration phenomenon exists in the hollow floor system. Along the x and z directions, the upper surface of hollow floor system mainly suffers from the compressive stress, and the lower surface of hollow floor system mainly suffers from the tensile stress. The stress maintains unchanged along the y direction.With the horizontal load and its gravity, it is also presented the'bowl' deformation along the vertical direction. The upper surface of the hollow floor system shrinks and the lower surface of the hollow floor system expands along the x direction, which is the same as that along the z direction. There is obvious stress concentration in the applied displacement boundary. From the system's x-and z- axial stresses, the upper surface of hollow floor system mainly suffers from the compressive stress and the lower surface of hollow floor system mainly suffers from the tensile stress, which is related to the corresponding'shrink' deformation in the upper surface slab and'expand'deformation in the lower surface slab, respectively. The y- axial stress in the upper surface slab is essentially the same with the stress in the lower surface slab, which suffers from compressive stress.The stress response and displacement response of three computational models with different radius are studied with the vertical load and the horizontal load. From the stress and displacement values with the different radius, it is shown that, compared with the'H'cross-section model, the'similar H' cross-section model is more reasonable for the equivalent of the actual hollow floor system.