竖向加速度设计反应谱研究

Research on Vertical Acceleration Design Response Spectrum

鉴于我国《建筑抗震设计规范》(GB 50011-2010)未给出竖向加速度反应谱表达式这一现状,本文收集292组美国地区的强震记录,研究了各种地震环境下不同结构阻尼比对谱比取值(V/H)的影响,针对场地等单一影响因素统计得出谱比平均值并采用遗传算法进行最优拟合。以场地因素上的拟合谱比为基准谱比,考虑震中距、阻尼等因素取修正以建立各地震环境下的谱比建议式。应用我国10抗震规范中水平加速度反应谱表达式和本文的谱比建议式,本文列举了一个示例地震环境,并推导出竖向加速度设计反应谱建议式,研究成果可供我国抗震规范参考。

According to the situation that Chinese ＂Earthquake Resistant Design Code＂ （GB50011-2010） does not rule the expression of vertical acceleration response spectrum, this paper collected hundreds of strong earthquake records in United States to study the influence of the factors such as seismic environment and structure damping ratio on the spectral ratio （V/H）. The authors selects some influencing factors which has a great impact on the spectral ratios and the regularity is good, including site conditions, epicentral distance and structural damping ratio. Based on genetic algorithm （GA） programming, the global optimum fitting results were researched. The fitted spectral ratio with impact of site condition as the datum spectral ratio is taken. Simultaneously, the impact of epicentral distance and damping ratio, was carried on the revision to the datum spectral ratio, thus the suggestion type of the spectral ratio under various earthquakes environment was established. Finally, the horizontal acceleration design response spectra was stipulated by current seismic design code of China and multiplied by the suggestion type of the spectral ratio from corresponding earthquake environment, then the suggestion type of the vertical acceleration design response spectra from this earthquake environment is obtained.