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在采用全概率方法的基于性能的地震工程研究中,定量反映地震作用和工程结构中存在的不确定性是研究的关键。利用地震易损性和地震风险的概率解析函数,针对一栋按我国相关规范设计的五层三跨钢筋混凝土框架结构进行了地震易损性分析和风险评估。采用100条实际地震动作为输入以考虑地震动的不确定性,提出了基于控制变换拉丁超立方体抽样技术的随机Pushover方法以考虑结构不确定性对其抗震能力的影响。结果表明:算例结构在50年内发生完全破坏的概率不超过2%,发生严重破坏的概率不超过10%,发生轻微破坏的概率基本不超过63.2%,基本满足我国“小震不坏、中震可修、大震不倒”的三水准要求。
In the study of performance-based seismic engineering using total probability method, it is the key point of research to quantitatively reflect the seismicity and the uncertainty existing in the engineering structure. Based on the probability analytic function of seismic vulnerability and earthquake risk, a seismic vulnerability analysis and risk assessment of a five-story three-span RC frame designed according to China’s relevant norms were carried out. Using 100 actual ground motions as inputs to account for the uncertainty of ground motions, a stochastic pushover method based on the control transforms Latin hypercube sampling technique was proposed to consider the effect of structural uncertainty on its seismic capacity. The results show that the probability of complete destruction in the example structure does not exceed 2% within 50 years, the probability of serious damage does not exceed 10% and the probability of minor damage does not exceed 63.2% In the earthquake repair, earthquake does not fall, "the three standards.