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混凝土空腹夹层板可以看作是通过剪力键连接的双重密肋楼盖,为了解其静力性能,考虑组成构件的刚度和结构高跨比影响,采用8节点弹性块体单元有限元模型在四点支承条件下进行25个算例分析.结果表明:结构内力分布与空腹网架类似,但剪力键变形时表现了整体转动的特点,肋及剪力键的承载力设计应计及弯矩影响;增加支承梁(框架梁)刚度有利于降低楼盖的挠度、改善梁边肋的内力分布,建议框架梁在满足楼盖刚度控制前提下采用较小的高跨比;增大结构总厚度可以有效提高其整体刚度及跨中截面承载力,当高跨比在1/30~1/20之间并采用现行规程的实用方法时,应重视楼盖角区上肋的承载力设计;表层薄板对结构刚度和承载力改善的意义不大,可按网格尺寸的1/40~1/30确定其厚度;楼盖的内力分布对肋刚度较为敏感,上、下肋截面高度可按网格尺寸的1/15~1/10确定,实用方法对肋承载力的调整措施需进一步研究;剪力键刚度对楼盖整体刚度的影响较小,工程设计需增大剪力键截面时,应提高楼盖角区和边节间肋的承载力,并应对角区剪力键予以加强.
In order to understand the static performance of concrete sandwich panel, the sandwich panel can be regarded as a double-ribbed floor with shear bond. Considering the stiffness of structural members and the high span ratio of structural members, a 8-node elastic block element finite element model The results show that the internal force distribution of the structure is similar to that of the empty web, but the deformation of the shear bond shows the characteristic of overall rotation. The design of the bearing capacity of the rib and the shear bond should be taken into account Moment. The increase of the rigidity of the support beam (frame beam) is beneficial to reduce the deflection of the floor and improve the internal force distribution of the beam edge rib. It is suggested that the frame beam should adopt the smaller high span ratio under the premise of controlling the rigidity of the roof; Thickness can effectively improve the overall stiffness and bearing capacity of the mid-span cross-section. When the practical method of using the existing codes is adopted when the span ratio is between 1/30 and 1/20, the design of the bearing capacity of the upper rib of the floor corner should be emphasized. The surface sheet is of little significance to the improvement of structural rigidity and bearing capacity. The thickness of the sheet can be determined by 1/40 ~ 1/30 of the mesh size. The internal force distribution of the floor is more sensitive to the rib rigidity. Grid size 1/15 ~ 1/10 OK, practical Method to adjust the rib bearing capacity needs further study; shear stiffness of the overall rigidity of the floor less impact on the project design to increase the shear-key cross-section, we should increase the corner of the floor area and the ribs between the bearing Force, and corner corner shear force should be strengthened.