某超高层建筑场地地震设计反应谱研究

场地地震设计反应谱是超高层结构抗震设计的重要依据,关系着结构设计的安全性和成本。结合某超高层设计案例,分析了不同超越概率对场地地震设计反应谱和水平加速度峰值的地震危险性概率贡献分布的影响,比较了场地地震设计反应谱与天然波平均反应谱的取值,验证了场地地震设计反应谱的可靠性。结果表明,对于超高层结构的抗震设计除考虑近场地震影响外,还应考虑远场大震影响,利用本文所述方法获得的天然波反应谱可用于结构抗震设计验算并能提高结构设计安全性。

Research of ground seismic design response spectrum on a super high rise building

Ground seismic design response spectrum is an important basis for seismic design of super high rise building, which is related with the structural safety and cost. A case of super high rise building design was introduced in the paper,in which the influences of different exceeding probabilities on ground seismic design response spectrum and contribution of seismic hazard of horizontal peak acceleration arc analyzed. And ground seismic design response spectrum was compared with natural seismic spectrum,which proved the reliability of ground seismic design response spectrum. The results showed that large earthquake of far-field should be considered besides earthquake of near-field in seismic design of super high rise building. The natural seismic spectrum derived by the method introduced in this paper could be the basis of structural checking calculation, which enhanced structural safety.