基于不规则块体几何指标的藏式毛石墙体抗震性能研究

为量化不规则毛石墙体几何指标(块体形状、块体尺寸、水平和竖向接缝)对其抗震性能的影响，对3片1/2缩尺的传统藏式毛石墙体进行低周往复荷载试验，获得其典型破坏形态、滞回曲线、骨架曲线等抗震性能参数。基于藏式毛石墙体的不规则构造特征和块体形状，结合灰色理论建立不规则块体面积、周长等9个形状参数与墙体地震响应特征的关联度。研究结果表明：低周往复荷载下块材几何尺寸对墙体抗震性能的影响最大；大块石组砌的墙体抗剪刚度和承载力均较大，且墙体规则性和质量等级较好、抗震性能更优。确定了量化藏式毛石墙体抗震性能的几何指标的方法，可用于评价藏式毛石墙体的基本受力性能。

Seismic performance analysis of Tibetan rubble stone walls based on irregular block geometry indexes

In order to quantify the influence of irregular geometry indexes (block shape, block size, bed and head joints) on seismic performance of rubble stone walls, three 1/2 scaled Tibetan rubble stone walls were tested under low cyclic loading to obtain their typical failure modes, hysteretic curves and skeleton curves, etc. Based on the structural characteristics and block shape of Tibetan rubble stone walls, the correlation between nine shape parameters, including the area and circumference of irregular block, and the seismic response characteristics of the wall was established with the grey theory. Research results demonstrate that the block geometry size is the most important parameter that influences the seismic performance of Tibetan rubble stone walls under low cyclic loading. Besides, for walls constructed with larger stone blocks, a higher shear stiffness and load bearing capacity can be observed due to the better regularity and quality compared with walls constructed with smaller stone blocks. At last, a method for determining the geometry indexes to quantify the seismic performance of Tibetan rubble stone walls was established, which can be used to evaluate the basic mechanical properties of Tibetan rubble stone walls.