填充砌块对密肋复合墙体受力性能影响的非线性数值分析

NONLINEAR NUMERICAL ANALYSIS OF INFLUENCE OF FILLED-BLOCK ON BEHAVIOR OF MULTI-RIBBED COMPOSITE WALL

运用有限元分析通用软件ANSYS,以有填充砌块和无填充砌块的两类1/2比例、考虑不同剪跨比的底部两层密肋复合墙体作为分析对象,对墙体模型在竖向和水平荷载作用下的侧移刚度、承载力及墙体截面应力应变分布特征等进行了非线性对比分析,得到填充砌块对复合墙体侧移刚度和压弯承载力贡献的量化分析结果,总结出填充砌块对提高复合墙体侧移刚度、改变墙体压弯破坏模式的作用。分析结果表明,加气混凝土填充砌块对复合墙体的侧移刚度具有较大贡献,对墙体抗弯承载力贡献不大,但对墙体的压弯破坏模式产生较大影响。该分析结果为建立密肋复合墙体压弯承载力简化计算方法提供了参考和依据。

Using finite element software ANSYS, adopting two types of multi-ribbed composite walls with and without filled-block as analysis objects, that are with 1/2 scale, bottom two stories considering different shearing-span ratio, lateral stiffness, bearing capacity, sectional stress and strain distribution of the walls under horizontal and vertical load were analyzed with nonlinear numerical method. The quantizing results of contribution of the filled-block for lateral stiffness and compression-bending bearing capacity of the wall were obtained, The effects of the filled-block for increasing lateral stiffness and changing compression-bending failure form of the wall were summed. The analysis results indicated that contribution of aerated concrete filled-block for lateral stiffness of the wall was larger than that for compression-bending bearing capacity, and compression-bending failure form of the wall were influenced by the filled-block, which provide support for establishing simplified calculation method of compression-bending capacity of the multi-ribbed composite wall.