再生混凝土自保温空心砌块孔型优化

Holes arrangement optimization in recycled concrete self insulation hollow block

为探求再生混凝土自保温砌块的合理孔型分布,设计了2种尺寸7种孔型分布的开孔形式,基于ABAQUS对7种孔型砌块的受力和热工性能进行了数值模拟分析.结果表明:受压破坏时,砌块肋壁边角处受力较为集中,在宽度方向肋壁出现受拉损伤区;受压破坏是一个渐进破坏过程,孔型排列对于Mises应力分布有较大影响;砌块破坏强度随开孔率增大而减小,开孔倒角处理有利于提高砌块抗压强度;开孔率相近时,3排孔以上的砌块增加厚度和开孔排数,对力学和热工性能的影响不大;增加开孔排数比增大排孔尺寸更有利于提高砌块的热工性能;开孔率小于33%时,适当增大开孔率有利于热工性能的提高.综合受压和热工两方面的指标,砌块Kc、Kd、Kf和Kg的孔型布置较为合理.

To pursue the reasonable holes arrangement in recycled concrete self insulation hollow blocks, 2 kinds of dimension blocks with 7 types different hole arrangement are designed; and their mechanical and thermal performances are numerical simulated by ABAQUS. The results of numerical simulation show that： The stress concentrates in the block ribbed wall corner and tensile damage zones appear in width di- rection ribs when blocks bearing compressive failure; compression failure of blocks is a progressive failure process; the holes arrangement has great influence on the Mises stress distribution. Failure strength of blocks decreases with increasing of hole ratio; hole chamfering can improve the failure strength. When number of rows of holes reached three, there are little effects on the mechanical and thermal properties of blocks by increasing the width and number of rows of holes. The effect of increasing number of hole rows is better than increasing holes size, and properly enlarging the hole ration is better for increasing blocks thermal performance when the hole ratio is under 33.3%. The holes arrangement of block Kc, Kd, Kf and Kg are reasonable comprehensively considering mechanical and thermal indexes.