sweetapricity/bridgedeck-nshm

该数据集名为Bridgedeck — USGS Seismic Hazard at Bridge Locations (NSHM 2014)，是bridgedeck数据集集合的一部分，专门用于美国桥面板劣化研究。它提供了从美国地质调查局2014年国家地震灾害模型中采样的每个美国本土（CONUS）桥梁位置的地震动灾害值。数据集包含三个谱加速度指标，对应50年内超越概率2%（约2475年重现期），这是美国建筑和桥梁设计规范中的标准。这些指标包括峰值地面加速度和两个不同周期的谱加速度。数据来源于USGS静态灾害曲线API，通过0.05°网格覆盖CONUS（625,721个网格点），桥梁值通过最近邻查找获取。数据集仅覆盖CONUS，排除阿拉斯加和夏威夷（因为它们使用不同的NSHM模型），约有1.6%的桥梁在海洋或领土坐标上超出USGS网格范围而具有空值。这是一个静态特征，不随时间变化，可用于与NBI桥梁数据通过bridge_id连接。地震灾害指标在桥面板劣化研究中具有重要性，例如sa1p0_2pct_50yr在bridgedeck XGBoost特征重要性中排名第7，证实了地震暴露对长期桥面板劣化的贡献。The dataset named Bridgedeck — USGS Seismic Hazard at Bridge Locations (NSHM 2014) is part of the bridgedeck dataset collection for US bridge deck deterioration research. It provides seismic ground shaking hazard values sampled at every CONUS bridge location from the USGS 2014 National Seismic Hazard Model. The dataset includes three spectral acceleration metrics at the 2% probability of exceedance in 50 years (approximately a 2,475-year return period), which is the standard used in US building and bridge design codes. These metrics are Peak Ground Acceleration and spectral accelerations at two different periods. The source data is obtained from the USGS static hazard curve API queried on a 0.05° grid covering CONUS (625,721 grid points), with bridge values obtained via nearest-neighbour lookup. Coverage is limited to CONUS only, excluding Alaska and Hawaii (as they have different NSHM models), and there are about 1.6% null values for bridges at ocean or territory coordinates outside the USGS grid. This is a static feature that does not vary by year and can be joined to NBI bridge data using the bridge_id key. Seismic hazard metrics are significant in bridge deck deterioration research, with sa1p0_2pct_50yr ranking #7 in the bridgedeck XGBoost feature importance, confirming that earthquake exposure contributes to long-term bridge deck deterioration beyond direct structural damage.