【摘要】 根据我国路桥抗震设计规范,桥梁工程设计地震动参数以重现期T=475年和2 000年的概率水准确定,地震危险性概率分析方法(PSHA)常用于计算此类工程的基岩峰值加速度(PGA)。以豫南地区某桥梁为研究对象,对地震动参数进行概率危险性计算。结果表明:该桥在重现期T=100、475和2 000年概率水准下的基岩峰值加速度分别为12.7、31.6和72.5 gal;对应水平向设计地震动峰值加速度分别为19.3、45.7和98.7 gal。研究区位于第5代中国地震动参数区划图0.05 g区,建议设计基本峰值加速度为50 gal,其与计算结果较为一致。更多还原

【Abstract】 According to anti-seismic design criterion for bridges and roads in China,the designed ground motion parameters of bridge design is determined by the probability level of reproduction period T = 475 years and 2000 years,probabilistic seismic hazard analysis( PSHA) is often used for calculating bedrock peak gravity acceleration( PGA) in similar project. This paper studied a bridge in southern Henan area to calculate the seismic hazard of ground motion parameters. Results show: At the probability reproduction period of T = 100 years,475 years and 2000 years,the bed rock PGA is respectively 12. 7,31. 6 and 72. 5gal; corresponding to horizontal designed ground motion PGA of respectively 19. 3, 45. 7 and98. 7gal. The studied zone is at 0. 05 G zone in 5th generation China Ground Motion Parameters Map,the authors suggests the designed basic PGA be 50 gal,which is coherent with calculation results.更多还原