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A simple uniform hazard design spectral shape for rock sites

机译：岩石场地的简单统一危害设计频谱形状

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Performance-based earthquake engineering (PBEE) concepts dictate that the return period of the seismic design ground motions be known. While the NEHRP (2001) seismic design spectrum is constructed using two spectral accelerations that have a 2,475-year return period, the overall spectral shape is not representative of a uniform hazard spectrum. Consequently, other than the two spectral accelerations used to construct the NEHRP spectrum, the return periods of the spectral accelerations defined by the NEHRP spectrum are unknown and may vary significantly. An alternative spectrum is proposed for firm rock sites. The proposed parabolic spectrum is constructed using three spectral accelerations (i.e., pga, S-S, and S-1) and a calibration parameter T-pga. Parabolic spectra were computed for approximately 500 cities across the conterminous 48 states using the pga, Ss' and S, having 2,475-year return period, as determined by the U.S. Geological Survey National Seismic Hazard Mapping Project. The correlation coefficients (r(2)) of the parabolic spectra to spectral accelerations for several oscillator periods having uniform probabilities of exceedance were computed for the cities. The results confirm that the spectral accelerations defined by the parabolic spectra have approximately constant return periods.
机译：基于性能的地震工程（PBEE）概念要求知道地震设计地震动的返回周期。尽管NEHRP（2001）的地震设计频谱是使用两个具有2,475年回归期的频谱加速度构建的，但整体频谱形状并不代表统一的危害频谱。因此，除了用于构造NEHRP频谱的两个频谱加速度之外，由NEHRP频谱定义的频谱加速度的返回周期是未知的，并且可能会发生显着变化。对于坚硬的岩石场地，提出了另一种频谱。所提出的抛物线频谱是使用三个频谱加速度（即pga，S-S和S-1）和校准参数T-pga构造的。根据美国地质调查局国家地震危险性测绘项目确定，使用pga，Ss和S，在48个州附近的大约500个城市中计算了抛物线谱，其返回期为2475年。为城市计算了抛物线频谱与几个具有均匀超出概率的振荡器周期的频谱加速度的相关系数（r（2））。结果证实，由抛物线谱定义的谱加速度具有近似恒定的返回周期。

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