独立式窑洞在地震作用下损伤指标的分析

摘要

定量地评估结构在地震作用下的损伤是地震工程领域的研究重点,增量动力分析方法已被广泛用于建筑结构地震易损性评估,而结构损伤指标是定量评估结构损伤情况的重要参数.山西北部农村地区的独立式土坯窑洞是一种拱受力结构体系,为研究拱结构在地震作用下的破坏特征并确立结构损伤指标,结合实际震害与数值模拟试验,分析了窑洞结构在地震作用下的破坏特征,对比了窑洞结构的顶点水平位移和拱顶竖向位移在不同地震动峰值加速度下与结构损伤情况的对应关系,发现窑洞拱顶竖向位移与窑洞拱矢高比作为窑洞损伤指标较为合理.%Quantitative assessment for the damage of the structure under earthquake has been focused by seismic engineering research.The incremental dynamic analysis method has been widely used in structural engineering, and the damage measure as the important parameter is necessary for quantitative assessment of structural damage.To study the seismic failure characteristics and damage measures of the independent adobe cave dwelling, which is located in the rural areas of northern Shanxi with an arched structural system, the historic earthquake damage and specimen test was investigated, and the damage process of the cave structure under earthquake was analyzed.Through compare with the vertex horizontal displacement and vault vertical displacement at each peek ground accel-eration, it was found that the ratios of vertical displacement of cave dome and cave arch span as quantitative assess-ment for cave seismic damage measures is more reasonable.