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基于汶川地震断层距150km内112条水平分量加速度记录,分析断层距、场地类型、地震动持时、上盘和下盘效应、方向性效应对SDOF(single degree of freedom)体系弹性地震输入能的影响。结果表明:近断层断层距30km范围应考虑加速度峰值增大对输入能显著提高的影响;场地越软输入能越大,输入能谱的特征周期并不随着场地越软而向右移动;地震动持时对输入能谱峰值相应周期的结构影响显著,持时越长,输入能谱峰值越大。近断层下盘效应和方向性效应对地震输入能有显著影响,断层距大于30km范围内,下盘效应使中、长周期结构的地震输入能显著提高。
Based on the records of 112 horizontal component accelerations within 150km of the Wenchuan earthquake, the effects of the fault distance, site type, ground motion, groundwall and footwall effect and directionality effect on the elastic seismic input energy of SDOF (single-degree of freedom) system are analyzed. influences. The results show that the influence of increasing acceleration peak on the input can be considered in the range of 30km near the fault. The softer the input energy, the greater the input energy of the field is, the characteristic period of the input spectrum does not move to the right as the field softens. Hold time on the peak of the input spectrum corresponding to the structure of the significant impact, holding longer, the greater the input spectrum peak. The effects of near-fault under-pan and directional effects have a significant impact on the seismic input. For the faults with a distance greater than 30 km, the disk-in effect can significantly increase the seismic input to medium- and long-period structures.