略阳县农居房屋抗震现状调查与评价研究

Investigation and Evaluation of Earthquake Resistance of Rural Houses in Lueyang County

为精准识别贫困山区农居房屋结构现状完好程度,本文开展略阳县境内41894栋农居房屋抗震现状实地调查,搜集整理域内孕灾环境和致灾因子强度,统计分析域内各行政镇(办)经济水平、农居房屋抗震结构类型和震害等级,预测震害矩阵,计算平均震害指数,并评价抗震能力。研究结果表明:域内农居房屋抗震结构类型包括土木结构、砖木结构和砖混结构;域内农居房屋在Ⅵ度地震作用下基本完好的比例为74.04%,在Ⅶ度地震作用下发生轻微破坏以下震害等级的比例为83.45%,在Ⅷ度地震作用下发生中等破坏以下震害等级的比例为85.46%;域内农居房屋在地震烈度为Ⅵ、Ⅶ、Ⅷ、Ⅸ、Ⅹ度时的平均震害指数分别为0.13、0.23、0.32、0.49、0.71,抗震性能较差,不满足"小震不坏、中震可修、大震不倒"的抗震设防目标。

To precisely evaluate the earthquake-resistance properties of hilly rural buildings,a total of 41 894 rural buildings in Lueyang County were censored and investigated,in which disaster-inducing factors,disaster-pregnant environment were collected.Based on these economic development levels,structure types of the rural buildings,and earthquake hazard grades in this county were also investigated to predict the earthquake hazards matrix,earthquake hazard index and earthquake-resistance capacity of the rural buildings.The results show there are three types of rural buildings with reference to earthquake-resistance capacity:mud-wood structure,brick-wood structure and brick-concrete structure.For the rural buildings investigated,under earthquake-intensity of Ⅵ,Ⅶ and Ⅷ,percents of the intact rural buildings,and slightly destroyed buildings and medium-destroyed buildings are 74.04%,83.45%,85.46%.And under the earthquake-intensity of Ⅵ,Ⅶ,Ⅷ,Ⅸ and Ⅹ,the mean hazard index are 0.13,0.23,0.32,0.49 and 0.71,indicating the investigated buildings have a bad performance in earthquake-resistance.And the the investigated buildings do not meet the requirement of the aim of earthquake resistanceof "no damage under minor earthquake,repairable under medium earthquake,no collapsing under major earthquake".