In this research the effect of diameter to thickness of pipe ratio (D/t), depth of burial to diameter (H/D) ratio, conditions of surrounding soil and different grades of steel on the seismic answer of straight buried steel pipelines is investigated within a probabilistic context. The results of incremental dynamic analysis of 15 pipeline models are used to evaluate the capacities of performance limit, the mean annual frequency (MAF) of exceeding structural limit states and levels of confidence of achieving seismic performance goals. It is obtained that for the pipes with the ratios of D/t over 39.9, increasing the ratio of D/t decreases the IM capacity, increases MAF of exceeding the performance objectives and reduces the confidence level of the pipes for meeting the performance objectives. It is found that increasing H/D ratio, increases MAF of exceeding the performance objectives by about 2.4 times. It is concluded that the D/t ratio of the pipelines has the most influence on the probabilistic seismic response assessment of the structures. The results show that using pipes with small D/t, soils with low Gs values, pipes with high steel grade, and reducing the burial depth of the pipelines, enhances their seismic performance.

中文翻译：

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基于地震作用的地下地面地震作用下基于可靠性的地震评估

在这项研究中，研究了直埋式钢管的地震响应对管径与壁厚之比（D / t），埋深与直径之比（H / D），周围土壤条件和不同钢种的影响。在概率范围内。15个管道模型的增量动态分析结果用于评估性能极限的能力，超出结构极限状态的平均年频率（MAF）以及实现地震性能目标的置信度。据获得的，对于具有的比管道d /吨以上39.9，增加的比率d /吨降低IM容量，增加超出性能目标的MAF，并降低满足性能目标的管道的置信度。发现增加H / D比会使超出性能目标的MAF增加约2.4倍。得出的结论是，管道的D / t比对结构的概率地震响应评估影响最大。结果表明，使用D / t小的管道，Gs值低的土壤，钢的等级高的管道以及减小管道的埋藏深度，都可以提高其抗震性能。