新西兰地震危险性岩土工程评估与设计的再评价

Misko Cubrinonski, B. Bradley, F. Wentz, A. Balachandra
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引用次数: 2

摘要

本文从岩土工程的角度分析了新西兰的地震灾害。NZS1170.5(结构荷载标准)和NZTA桥梁手册(NZTA- bm)中地震危险性的两个编纂版本显示,在新西兰各地产生一致不同的峰值地面加速度(PGA)危险。来自新西兰24个地点特定PSHA的结果用于检查关键危险特征,包括地震震级和场地条件(类别)对PGA危险的影响。对比评价结果表明,NZS1170.5和NZTA-BM高估了大部分地区的PGA危害。然而,NZS1170.5,特别是NZTA-BM,明显低估了离Hikurangi俯冲带(HSZ)距离较短的地点的PGA危害,而HSZ对这些地点的危害起着重要作用。根据这项研究的结果,建议将临时PGA危害用于岩土工程评估和设计,以支持新西兰岩土地震工程实践指南。推荐的临时PGA危害适用于所有现场类别,无需任何修改或使用现场放大因子。
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Re-evaluation of New Zealand seismic hazard for geotechnical assessment and design
This paper scrutinises the seismic hazard of New Zealand (NZ) from a geotechnical engineering perspective. The two codified versions of the seismic hazard in NZS1170.5 (structural loading standard) and NZTA Bridge Manual (NZTA-BM) are shown to yield consistently different peak ground acceleration (PGA) hazards throughout NZ. Results from site-specific PSHA for 24 locations in NZ are used to examine key hazard characteristics, including earthquake magnitude and the effects of site conditions (classes) on the PGA hazard. The comparative evaluations show that for most of the locations considered, NZS1170.5 and NZTA-BM overestimate the PGA hazard. However, NZS1170.5, and NZTA-BM in particular, significantly underestimate the PGA hazard for locations that are at a short source-to-site distance from the Hikurangi Subduction Zone (HSZ), and for which HSZ significantly contributes to their hazard. Using the results from this study, an interim PGA hazard is recommended for geotechnical assessment and design in support of the NZ guidelines for geotechnical earthquake engineering practice. The recommended interim PGA hazard is applicable to all site classes without any modification or use of site amplification factors.
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来源期刊
CiteScore
2.50
自引率
17.60%
发文量
14
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