考虑年均倒塌概率的结构倒塌安全储备可接受值

发布时间：2018-09-19 14:19

【摘要】：推导出结构年均倒塌概率与结构倒塌安全储备之间的关系,并提出依据年均倒塌概率可接受值计算可接受倒塌安全储备系数CMR的方法。利用全概率理论,将倒塌易损性与地震危险性进行耦合,得到结构年均倒塌概率,采用中值倒塌地震强度建立年均倒塌概率与结构倒塌安全储备系数CMR的关系。结合大震倒塌概率可接受值确定年均倒塌概率可接受值,进而计算结构可接受倒塌安全储备系数CMR。结合我国抗震规范规定的加速度反应谱建立CMR谱,给出了乙类、丙类结构在不同设防烈度下的可接受年均倒塌概率值以及可接受CMR值。研究表明:结构可接受年均倒塌风险越低,结构的倒塌安全储备可接受值越大,并呈现幂函数的数学关系,而可接受年均倒塌概率又与大震强度、地震危险性以及总倒塌不确定性有关。依据我国抗震设计规范背景建议的特定可接受年均倒塌概率下的可接受CMR谱,可以反映不同周期区间结构随总倒塌不确定性变化的规律,可用于结构倒塌安全储备的快速评估。基于CECS392建议的可接受大震倒塌概率计算得到乙类建筑的可接受年均倒塌概率远小于丙类建筑,均随着设防烈度的提高而下降,相应的CMR可接受值则呈现增加趋势。
[Abstract]:The relationship between the annual average collapse probability and the structural collapse safety reserve is deduced, and a method for calculating the acceptable collapse safety reserve coefficient (CMR) based on the acceptable value of the annual average collapse probability is proposed. The relationship between the annual average collapse probability and the structural collapse safety reserve coefficient CMR is established. The acceptable value of the annual average collapse probability is determined by combining the acceptable value of the collapse probability of large earthquakes, and then the acceptable collapse safety reserve coefficient CMR is calculated. Acceptable annual average collapse probability and acceptable CMR values under different fortification intensity. The results show that the lower the acceptable annual average collapse risk, the greater the acceptable value of collapse safety reserve and the mathematical relationship between the acceptable annual average collapse probability and the earthquake intensity, seismic risk and total collapse uncertainty. According to the acceptable CMR spectrum under the specific acceptable annual average collapse probability suggested by the background of the code for seismic design of our country, it can reflect the change rule of the structure with the total collapse uncertainty in different period intervals, and can be used for the rapid evaluation of the structure collapse safety reserve. The acceptable annual collapse probability of Class I buildings is much lower than that of Class C buildings, and decreases with the increase of fortification intensity, while the corresponding acceptable value of CMR increases.
【作者单位】：辽宁工程技术大学建筑工程学院;东北大学资源与土木工程学院;大连理工大学土木工程学院;大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金项目(91315301) 国家重点基础研究发展计划(973计划)项目(2013CB036305)
【分类号】：TU312.3

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