【摘要】 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。更多还原

【Abstract】 112 recordings within 150km to causative fault surface during the Wenchuan earthquake are used to establish a database.The influences of rupture distance,site conditions,duration of ground motion,effects of hanging wall and footwall,and directivity effect on elastic input energy are investigated based on the energy responses of SDOF(single degree of freedom) structure.Within rupture distance 30km,the structural input energy should be approved due to the amplified peak of acceleration.A softer the site condition leads to a higher input energy.The characteristic period corresponding to the peak of input energy spectra is not moved to the right due to site effects.The peak of input energy spectra is affected by the duration of ground motion,and it increases as the duration of ground motion increasing.In the near-fault regions,footwall effect and directivity effect have strongly impact upon the input energy of structure for a given period.When rupture distance is larger than 30km,higher input energy on footwall are demanded in the range of medium and long periods.更多还原