空腹夹层板最合理结构高度的对比与分析

Analysis and comparison of most reasonable structural height for open-web sandwich plate

为研究结构高度对空腹夹层板刚度和保温隔热性能的影响规律,采用有限元软件建立了15个空腹夹层板和1个等体积实心混凝土板的模型,并分析了模型的变形、冬季保温、夏季隔热性能指标。结果表明：空腹夹层板存在一个最合理高度使得结构刚度最大、变形最小,且数值基本保持在跨度的1/15左右;同样存在一个最合理高度使空腹夹层板的保温隔热性能最佳,保温和隔热性能指标分别为等体积实心混凝土板的34.78倍和34.4倍,数值保持在700mm左右;当结构高度从700mm变化到跨度的1/15时,空腹夹层板的变形改变并不显著,挠度均满足相关规范要求,而保温隔热性能却下降非常显著。建议在满足挠度要求的基础上,空腹夹层板结构的高度宜取700mm,可获得较好的刚度和最优的保温隔热性能。

In order to study the influence of structural height on stiffness and thermal insulation performance of open-web sandwich plate,finite element softwares were used to establish fifteen open-web sandwich plates model and one equal volume solid concrete plate model. The deformation of the model and thermal insulation performance indicators in winter and summer were analyzed. The results show that there is a most reasonable structural height of the open-web sandwich plate,which makes the structural rigidity maximum and the deformation minimum,and the value is basically maintained at about 1/15 of the span; there is also a most reasonable height for the best thermal insulation performance of the open-web sandwich plate. The thermal insulation performance indicators in winter and summer are 34. 78 and 34. 4 times that of solid concrete slabs of equal volume,and the height value is about 700 mm; when the structural height changes from 700 mm to1/15 of the span,the deformation of open-web sandwich plate is not significantly changed,and the deflections meet the relevant specifications requirements,but the thermal insulation performance has decreased significantly. It is recommended that,on the basis of satisfying the deflection requirements,the height of the open-web sandwich plate structure should be700 mm to achieve better stiffness and optimal thermal insulation performance.