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划分了西宝高速公路研究区域地震区带和潜在震源区,选取地震动峰值加速度(PGA)作为公路地震危险性评价指标,在PGA衰减关系、地震危险性概率计算方法和场地地震动影响分析的基础上,计算了西宝高速公路研究区域未来50年内超越概率2%、10%和63%的PGA分布,绘制了地震危险性分区图。总结了公路结构物地震危险性评价方法,开展了漆水河大桥、千河大桥、沣河大桥和渭河大桥等典型结构物的地震危险性评价。结果显示,西宝高速公路沿线区域跨越Ⅶ度和Ⅷ度基本烈度区,评价结果略高于我国第四代地震区划图,这是与渭河断陷盆地地震活跃的现实一致的;漆水河大桥和千河大桥的地震危险性是可控的,沣河大桥和渭河大桥的地震危险性不可控,应采取工程措施进行抗震加固。
This paper divides the seismic zone and the potential source area in the study area of Xibao Expressway. PGA is selected as the evaluation index of highway seismic hazard. Based on the PGA attenuation relationship, the calculation method of seismic hazard probability and the influence of site ground motion On the basis of this, the PGA distributions exceeding 2%, 10% and 63% of probability in the study area of Xibao Expressway in the next 50 years are calculated and the zoning map of the seismic hazard is drawn. The evaluation methods of seismic hazard of highway structures are summarized, and the seismic risk assessment of typical structures such as Qishui River Bridge, Qianhe Bridge, Bahe Bridge and Weihe River Bridge are carried out. The results show that the area along the Xibao Expressway crosses the Ⅶ and Ⅷ degree basic intensity areas and the evaluation result is slightly higher than that of the fourth generation of China’s seismic zoning map, which is consistent with the seismic active in the Weihe rift basin. The seismic risk of Heqianhe Bridge is controllable. The seismic hazard of Bahe Bridge and Weihe River Bridge can not be controlled. Therefore, engineering measures should be taken to reinforce the earthquake.