基于柱实体元及活荷载不利布置的无梁楼盖设计

Design of Flat Slab Structure Based on Column Simulated by Solid Element and Unfavorable Arrangement of Live Load

由框架柱模拟方式对柱顶托板弯矩峰值影响与进行活荷载不利布置的必要性两个方面展开,讨论无梁楼盖设计中的相关问题,并提出以下建议:(1)考虑框架柱实际截面尺寸影响,采用实体单元模拟框架柱,使其与托板相连接区域由一个点变成一个面,能够减缓柱顶处应力集中程度,可以起到弯矩削峰的作用,有助于合理化配置柱顶托板处配筋,且此方法同样适用于筏板基础设计;(2)对地库顶板等活荷载相对较大工程,活荷载不利布置对无梁楼盖的设计影响较大,应当考虑,实际工程设计中,可以采用基于广义单元并结合Sap2000中Range Add荷载组合方式加以实现,不受跨度、荷载类型等的影响。

With two aspects one is the influence of frame column simulation mode to the peak moment of column top supporting plate and another is the significance of unfavorable live load distribution to the flat slab structure,this paper discusses the relevant problems in the design of flat slab structure,and puts forward some suggestions.Firstly,considering the influence of the actual section size of the frame column,the solid element is used to simulate the frame column,so that the connection zone between the frame column and the supporting plate is changed from a point to a surface,which can slow down the stress concentration at the top of the column,achieve the purpose of bending moment peak cutting,and help to rationally configure the reinforcement at the top of the column,and this method is also applicable to the raft foundation design;secondly,for the basement roof and other similar projects whose live load is relatively heavy,the affect of unfavorable live load distribution is can’t be ignored in the design of the flat slab structure.The design of the influence about unfavorable live load distribution to a flat slab structure can be realized based on the generalized element and combined with the load combination mode“range add method”in SAP2000,which is not affected by span and load type etc.