Behavior of Peak Vertical Acceleration Across Small Two- Dimensional Strong-Motion Array

小型二维强运动阵列的峰值垂直加速度行为

• 批准号: 8619612
• 负责人: Mansour Niazi
• 金额: $ 18.2万
• 依托单位: TENERA L P
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-06-01 至 1990-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8619612&HistoricalAwards=false
• 关键词: Behavior; Peak; Vertical; Acceleration; Across

This is a 1985 SBIR Phase II award. Spatial coherence of the vertical component of ground motion across a dense two-dimen- sional array for as many as 30 shallow earthquakes which produced approximately 200 high quality observations over a small area of engineering interest at distance of 50 km or less will be studied. The data consists of digitally recorded vertical accelerograms, across the 12-element inner-ing subarray (200m radius) of the SMART-1 Array in northeastern Taiwan, plus the central station. The abundant near-source strong ground motion data permit major improvements in the attenuation relation and the shape of vertical response spectra, both of critical impor- tance in engineering design, and their associated uncertainties. For the projected subarray the uncertainties are only minimally affected by site classification. Dispersion of the ground motion parameters in time and frequency domains will be studied as a function of source depth, distance, azimuth and magnitude. The impact of known subsurface structure and the anelastic response of the soil column (for different levels of shaking) will be evaluated. Understanding of the near-source behavior of vertical acceleration across a dense array outside the western U.S. allows independent verification f assumed relationship between vertical and horizontal ground motion parameters and devise of new site specific attenuation law and response spectra both of engineering importance in the design.

这是1985年的SBIR第二阶段奖。将研究近30次浅层地震的地面运动垂直分量在密集的二维阵列上的空间一致性，这些浅层地震在距离50公里或更短的小范围内产生了大约200个高质量的工程观测。这些数据包括台湾东北部SMART-1阵列的12单元内环子阵列(半径200米)以及中央站的数字记录的垂直加速度记录。丰富的近源强地面运动数据使垂直反应谱的衰减关系和形状有了很大的改善，这两个方面都是工程设计中的临界重要性，以及与之相关的不确定性。对于投影子阵列，不确定度仅受场地分类的最小影响。将研究地震动参数在时间域和频域中的离散性，作为震源深度、距离、方位和震级的函数。将评估已知地下结构的影响和土柱的滞弹性响应(针对不同程度的震动)。了解美国西部以外密集阵列上垂直加速度的近源行为，可以独立验证垂直和水平地面运动参数之间的假设关系，并设计出新的场地特定衰减规律和反应谱，这两种方法在设计中都具有重要的工程意义。