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概率地震需求分析作为地震易损性分析和地震风险分析的重要一环,已经成为新一代基于性能地震工程(PBEE)的主要研究内容。概率地震需求分析的核心内容是建立概率地震需求模型,它表征了地震动强度与地震需求之间的概率关系。在某一强度地震动作用下,通常假设地震需求服从对数正态分布,其中,地震需求的中位值和地震动强度之间假设服从对数线性关系,而地震需求的对数标准差则假设保持不变。该文以4个不同高度、不同设防水准的钢筋混凝土框架结构为例,挑选100条实际地震动为输入,针对上述概率地震需求模型基本假设的合理性进行了讨论。研究结果表明:综合考虑计算精度和效率,关于地震需求中位值和对数标准差的假设可以满足概率地震需求模型的要求,而传统的对数正态概率地震需求模型无法考虑倒塌的影响,应予以修正。
As an important part of seismic vulnerability analysis and seismic risk analysis, probabilistic seismic demand analysis has become the main research content of the new generation of performance-based seismic engineering (PBEE). The core of probabilistic seismic demand analysis is to establish a probabilistic seismic demand model that characterizes the probabilistic relationship between seismic intensity and seismic demand. Under the action of a certain intensity of ground motion, it is usually assumed that the seismic demand obeys a logarithmic normal distribution. The median of seismic demand and ground motion intensity assume a logarithmic linear relationship, while the log standard deviation of seismic demand Assumptions remain unchanged. Taking four reinforced concrete frame structures with different heights and fortifications as an example, 100 actual earthquakes are selected as inputs. The rationality of the basic assumptions of the above-mentioned probabilistic earthquake demand model is discussed. The results show that the assumption of median and logarithmic standard deviation of seismic demand can meet the requirements of probabilistic seismic demand model considering the calculation accuracy and efficiency. However, the traditional log-normal probability seismic demand model can not consider the impact of collapse, Should be amended.