砖砌体房屋三水准抗震能力判别方法

Three level seismic capacity identification method of brick buildings

震前对现有砖砌体房屋抗震能力的判别是对该类房屋采取有效抗震减灾措施的重要依据,对减少该类房屋在地震中的破坏有着重要的实用价值。在我国现有《建筑抗震鉴定标准》(GB 50023—2009)给出的砖砌体房屋抗震能力指数法的框架下,引入抗震能力系数法,实现与抗震设计规范相对应的砖砌体房屋基于烈度的三水准抗震能力判别方法;将其与地震动参数联系起来,给出地震动参数-破坏状态的对应关系,实现砖砌体房屋基于地震动参数的三水准抗震能力判别方法;对汶川地震中发生震害的一栋砖砌体房屋进行抗震能力判别,与实际震害相比较,吻合得很好,并对其进行了三水准抗震能力的判别,表明该房屋满足抗震设防烈度为Ⅶ度时小震不坏、中震可修、大震不倒的抗震设防要求,验证了方法是可行和有效的,对同时进行不同设防水准下房屋抗震能力的判别是实用的。

Identification of seismic capacity of existing brick buildings before earthquakes is an important for taking effective seismic resistance and disaster reduction measures, which has a significant practical value to mitigate the damage of the buildings in the earthquakes. In the framework of seismic capacity index method for brick buildings, which is given the current national Standard for seismic appraisal of buildings （ GB 50023-2009） , the seismic capacity coefficient method was proposed. The seismic capacity identification method for three levels of intensity given in the seismic design code was realized. By integrating it with ground motion parameters, the relationships between the ground motion parameters and damage states were provided. The seismic capacity identification method for brick buildings based on ground motion parameters of three level intensities was realized. The seismic capacity of a brick building was studied by comparing the actual damage in the Wenchuan Earthquake with the analysis results, and it is found that the damages observed in the Wenehuan earthquake and those obtained from the analysis agree very well. The three level seismic capacity identification of this brick building was conducted, and the results showed that the buildings in the zones with fortification intensity Ⅶ satisfied the seismic precautionary requirements, i.e. ＂not damaged under small earthquakes, repairable under moderate earthquakes, not collapsed under large earthquakes＂. The feasibility and effectiveness of the method were verified, and it can be concluded that the method is practical for the identification of the seismic capacity of the buildings designed for different seismic fortification levels.