密肋复合墙的水平薄弱层破坏准则

Horizontal weak-layer failure criteria for multi-grid composite wall

密肋复合墙是由填充砌块、混凝土框格(肋柱、肋梁)组成的网格式抗震墙,框格内填充砌块布置(拼砌)方式是影响框格层间承载力的重要因素。在前期研究工作基础上,分析了框格内不同布置方式下填充砌块的受力机制和变形特点;以既有密肋复合墙、框支-密肋复合墙试验为例,从试验角度验证了密肋复合墙的水平薄弱层破坏现象;引入砌块布置方式影响系数对水平薄弱层受剪承载力计算式进行改进,提出了不同砌块布置方式墙体的影响系数的建议取值范围。研究结果表明,水平薄弱层破坏是密肋复合墙的典型破坏现象之一,改进的受剪承载力计算式能够考虑填充砌块布置方式对承载力的不利影响,有助于提高密肋复合墙受剪设计的安全裕度。

The multi-grid composite wall is a type of seismic wall which is composed of the infilling block and the concrete frame grid ( grid column,gird beam) . Layout of the blocks in the grid is an important factor affecting the bearing capacity of the frame layer. On the basis of previous research work,the mechanical behavior and deformation characteristics of infilling blocks with different layout in the grid were analyzed. Model test of one composite wall and one frame supported composite wall were conducted,and the failure of the horizontal weak layer of the multi-grid composite wall was verified from the experimental point of view. The influence coefficient of the block layout was introduced to improve the formula of the shear bearing capacity of the horizontal weak layer,and the range of influence coefficient of different block layout was preliminarily suggested. The results of the study show that the failure of the horizontal weak layer is one of the typical failure phenomena of the multi-gird composite wall. The improved formula of shear bearing capacity can consider the adverse effect of infilling block layout on the bearing capacity. The improved formula is helpful to improve the multi-grid composite wall shear design safety margin.