基于多维能力谱法的震损建筑抗震评价方法

Study on the Earthquake Damaged Buildings Evaluation Method Based on Multi-Dimensional Capacity Spectrum Method

目的研究震损建筑的抗震能力评估方法,得出震损建筑的抗震能力,提出基于静力弹塑性分析的震损抗震评价方法,为编制震损建筑抗震评价标准提供基础数据.方法针对各种结构类型的震损建筑,建立考虑实际情况的多维地震作用下震损建筑结构的弹塑性损伤模型,利用刚度退化建立震损建筑模型,对结构x和y两方向进行推覆分析得到结构的能力曲线,并使用多维能力谱法对结构进行评估.结果笔者通过算例分析得出该结构性能点,x方向的损伤指数为0.77,y方向的损伤指数为0.92,多维能力谱法与简化的能力谱法结合考虑了地震的多维性更符合实际情况.结论笔者通过算例分析得到了单自由度体系下震损建筑各阶模态的结构性能目标,又通过多个振型的组合得到多自由度体系下结构的性能目标.最后由损伤指数公式算出该结构的损伤程度.笔者的方法简便、易行,可用于实际工程.

The paper aims to study the earthquake-resistant capacity assessment methods of earthquake damaged buildings, so as to get the earthquake-resistant capability of earthquake damaged buildings and then provide the basic data to the preparation of earthquake damaged buildings seismic evaluation standards based on static pushover analysis of seismic earthquake damage evaluation method. In view of various structural types of earthquake damaged buildings,considering the actual situation, this paper builds an elasto-plastic damage model of multi-dimensional seismic building structures under earthquake damaged. Taking use of the stiffness degradation model for the establishment of earthquake damaged buildings, two pairs of structures x and y direction thrust. By using structural analysis of the ability to get curves and use the multi-dimensional capacity spectrum method for structural assessment. This paper obtains the structure performance point by numerical analysis of cases, x direction of the damage index 0. 77, y direction of the damage index 0. 92. The multipeacekeeping capacity spectrum method and simplified capacity spectrum method combined with multi-dimensional nature of the earthquake consider more in line with the actual situation. Through the numerical example, under a single degree of freedom system,this paper gets the construction of earthquake damaged and the structure of first-order modal performance objectives. Furthermore, through the combination of multiple vibration mode under the multi-DOF system, this paper also gets the structure of performance goals. Finally, index formula is calculated from the damage of the structure of the injury. This method is simple, easy and can be used for practical projects.