【摘要】 抗震设计中选取合适的地震动记录集进行弹塑性时程分析校验，是确保实际地震作用时结构具有安全保障的有效方法之一。为此，以我国抗震设计规范谱为目标谱，提出了一种考虑谱值离散性的地震动记录集选取方法。该方法在已有研究基础上对记录集的加速度反应谱谱值离散性进行设定，采用改进的贝叶斯嵌套贪婪优化算法进行全周期匹配的地震动记录集选取；通过对比不同选取方法的谱匹配结果，验证了有关谱值离散设定的合理性与所提方法的有效性，给出了两种工况下全周期满足规范谱值误差要求的记录集供工程参考使用。此外，采用OpenSees软件建立在7度区、8度区结构模型，分别选取148、263条地震动记录，通过POC(point of comparison)法确定结构的响应真值。以该响应真值为基准，对不同选取方法得到的结构最大层间位移角进行分析。结果表明，文中所提方法选取的地震动记录集在结构响应上同响应真值具有更好的一致性，中值偏差最大为10%，同一记录集输入下不同周期结构的最大层间位移角变异系数均保持在30%以内且趋于一致，结构响应的离散性较为稳定。更多还原

【Abstract】 Selecting an appropriate set of ground motion records for elastoplastic time-history analysis in seismic design is one of the effective methods to ensure structural safety during actual earthquakes. This paper proposed a method for selecting ground motion records considering the dispersion of spectral values, with reference to the seismic design code spectrum of China. Based on existing research, this method set the dispersion of the acceleration response spectrum values of the record set and used an improved Bayesian nested greedy optimization algorithm to select ground motion records that match the entire period. By comparing the spectral matching results of different selection methods, the rationality of the spectral value dispersion setting and the effectiveness of the proposed method were verified. The paper provided record sets that met the code spectrum value error requirements for two working conditions for engineering reference. Additionally, two structural models were established for each of the seismic intensity levels Ⅶ and Ⅷ using OpenSees software, and 148 and 263 records were selected, respectively, to determine the true structural response values through the point of comparison(POC) method. Taking these true response values as a benchmark, the maximum inter-story drift ratios obtained by different selection methods were analyzed. The results show that the proposed method achieves better agreement with the true structural response, with a maximum median bias within 10%. Moreover, under the same record set input, the coefficients of variation of the maximum inter-story drift ratios for structures with different periods are all maintained within 30% and tend to be consistent, indicating improved stable dispersion in structural responses.更多还原