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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。
According to the two kinds of loading conditions of the underground parking floor load and the underground human defense floor load, the cavity moldless girder floor with heavy duty column cap and light cap were uniformly loaded. Through reasonable model simplification, the mechanical analysis is carried out by ANSYS finite element software, and the calculation results are compared. The results show that the maximum tensile stress of floor slab with heavy column cap is 68% of that with light column cap and the maximum compressive stress of floor span with heavy column cap, which is 90% of that with light cap. It proves that the heavy-duty cap can effectively increase the connection area between the plate and the column and reduce the width of the grid plate, so that the support can withstand larger shearing force and improve the punching resistance of the top plate. Especially in the underground civil air defense structural layer using cavity mode beamless floor, the use of heavy-duty column cap can significantly reduce the board overloading and large column spacing and other unfavorable factors, so that the structure of the force more reasonable. The research can provide a theoretical basis for the design of the hollow cavity moldless beam floor cap in the underground structure.