严寒地区基于热工和力学性能的混凝土自保温砌块设计及优化

发布时间：2018-10-31 17:14

【摘要】：设计了一种墙厚280 mm、满足东北严寒地区节能要求的混凝土自保温砌块.首先,分析了影响混凝土自保温砌块保温及受力性能的主要指标;其次,基于规范对砌块块形的相关要求,设计了15种自保温砌块块形;然后,利用ANSYS有限元分析软件,求解这15种砌块的传热系数和抗压强度;最后,运用多目标性能优化方法对砌块热工性能、力学性能和容重进行综合优化,得出最佳块形,并对其进行二次热工性能、力学性能优化,以得到最终最优块形.结果表明:最终最优块形的传热系数为0.350 W/(m2·K),毛截面抗压强度为6.50 MPa,横肋与竖肋应力相近,自保温砌块受力更加合理;在空心率相同的前提下,自保温层宜采用非均匀排列,近冷热源两侧端面的保温层越厚,砌块保温节能效果越好.
[Abstract]:A concrete self-insulating block with 280 mm, wall thickness is designed to meet the energy saving requirements in northeast cold area. Firstly, the main indexes affecting the thermal insulation and mechanical performance of the concrete self-insulating block are analyzed. Secondly, 15 kinds of self-insulating block shapes are designed based on the relevant requirements of the specifications for the block shape. Then, the heat transfer coefficient and compressive strength of the 15 blocks are solved by ANSYS finite element analysis software. Finally, the multi-objective performance optimization method is used to comprehensively optimize the thermal performance, mechanical properties and bulk density of the block, and the optimum block shape is obtained, and the secondary thermal and mechanical properties are optimized to obtain the final optimal block shape. The results show that the heat transfer coefficient of the final optimum block shape is 0.350 W / (m ~ 2 K), gross cross section compressive strength is 6.50 MPa,), the stress of transverse rib and vertical rib is close to that of vertical rib, and the stress of self-insulating block is more reasonable. On the premise of the same air heart rate, the self-insulation layer should be arranged inhomogeneously. The thicker the insulation layer near both sides of the cold and heat source is, the better the energy saving effect of the block is.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：“十二五”国家科技支撑计划资助项目(2011BAJ08B04) 江苏省普通高校研究生科研创新计划资助项目(3205004905)
【分类号】：TU522.3

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