摘要
针对地下停车场楼面荷载和地下人防层楼面荷载2种荷载条件,分别对带有重型柱帽和轻型柱帽的空腔模无梁楼盖中进行均布加载。通过合理的模型简化,运用ANSYS有限元软件进行力学分析,并对计算结果进行比较。结构表明:采用重型柱帽的楼板板顶最大拉应力,为采用轻型柱帽的68%;采用重型柱帽的楼板跨中最大压应力,为采用轻型柱帽的90%。由此证明:重型柱帽能够有效地增加板与柱的连接面积,减小区格板带的宽度,从而使支座能承受较大的剪力,提高顶板抗冲切能力。特别是在地下人防结构层中采用空腔模无梁楼盖时,选用重型柱帽能够显著地减弱板顶超载和柱距较大等不利因素的影响,使结构受力更加合理。研究可为地下结构中空腔模无梁楼盖柱帽的设计提供理论依据。
Under two kinds of floor load conditions of the underground parking and the underground civil air defense, uniform loading was applied on the empty cavity flat slab floor with heavy column cap or light column cap respectively. Through the reasonable model simplification,ANSYS finite element software was used to carry out mechanic analysis and the calculation results were compared. The result shows that maximum tensile stress at the plate top of the floor with the heavy column cap is 68% of the floor with the light column cap,maximum compressive stress at the midst of the plate floor with the heavy column cap is 90% of the plate floor the light column cap. It proves that the heavy column cap can effectively increase the contact area of the slab and the column and can reduce the width of the grid plate,which can make the supporting seat sustain larger shear and enhance the roof 's punching shear capacity. Especially when it is used in the underground civil air defense structure,the heavy column cap can effectively decrease the influence of adverse factors such as over loading and large intercolumniation and make the stress of the structure more reasonable. The study can provide theoretical basis to the column cap design of empty cavity flat slab floor in the underground structure.
出处
《建筑结构》
CSCD
北大核心
2012年第S2期388-391,共4页
Building Structure
基金
贵州省科技攻关项目(黔科合GY字(2011)3030)
关键词
地下结构
楼面荷载
空腔模无梁楼盖
柱帽
ANSYS软件
力学分析
underground structure
floor load
empty cavity flat slab floor
column cap
ANSYS software
mechanic analysis
