一种新型石膏空腔模无梁楼盖拓扑结构及静力分析

摘要

Gypsum embedded filler flat plate floor,which uses precast gypsum embedded fillers as permanent formworks, is a monolithic cast-in-situ hollow concrete floor system.There are five kinds of structures.They are waffle slab,composite open-web floor,composite cross-beam and open-web floor,cross-beam floor,and nine-rectangle-grid floor.According to topology optimization of solid floor structure of two or three spans by ANSYS,72 false density distributions have been ob-tained.On the basis of the above results,a new structural model with composite hidden-prop-cap and cantilever-three-rib floor can be designed.Through the static analysis under vertical load by ANSYS,deflection and stress distribution of com-posite hidden-prop-cap and cantilever-three-rib floor are studied in detail.The results show that the stress of composite hid-den-prop-cap and cantilever-three-rib floor does not take on obvious characteristics of solid floor.So its strength of concrete and reinforcement does not been fully used and its reinforcement design will be complex.However,the composite hidden-prop-cap and cantilever-three-rib floor is suitable for those buildings which large span and whose floors under big loads be-cause of the less consumptions of concrete,good vertical rigidity and small peak tensile stress.%石膏空腔模无梁楼盖是以预制石膏空腔模为永久性施工内模的整体现浇空心楼盖，有密肋式、空腹板架式、井字－空腹板架组合式、井式、9区格式五种结构。用 ANSYS 对不同情况下的双跨、三跨楼盖做拓扑优化，得到72张单元伪密度云图并归纳伪密度分布规律，在此基础上设计一种新型结构———暗柱帽－悬挑三肋楼盖。用 AN-SYS 对暗柱帽－悬挑三肋楼盖做竖向荷载作用下的静力特性理论分析，详细研究其挠度和正应力分布。研究表明：暗柱帽－悬挑三肋楼盖的正应力分布不呈实体板特征，不利于发挥材料强度和配筋设计；但是混凝土用量少、竖向刚度好、峰值拉应力小，适合大跨度、大荷载的楼盖结构。