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基于大型振动台试验,研究小角度成层倾斜场地在倾向、走向、垂向、坡面方向、坡面垂直方向上的地震动响应特征,以及地层倾角对场地反应谱的影响规律。试验结果表明:在倾向方向,随着地层倾角的增大,倾斜场地的放大效应增大;在走向方向,当地层倾角小于12.5°时,放大效应强于水平成层场地;在倾向、走向方向,当地层倾角达到12.5°时,场地对反应谱短周期T≤0.1 s部分具有放大作用,对T>0.1 s的部分具有削弱作用;在垂向方向,随着地层倾角的增加,倾斜场地的放大效应强于水平成层场地;在坡面方向,倾斜场地的放大效应弱于水平成层场地;在坡面垂向方向,倾斜场地的放大效应强于水平成层场地。该研究成果对小角度成层倾斜场地上的建筑物抗震设计具有一定的参考意义。
Based on the large-scale shaking table test, the ground motion response characteristics of small-angle stratified inclined sites in the direction, direction, vertical direction, slope direction and vertical direction of slope are studied, and the influence law of formation dip on the field response spectrum is studied. The results show that in the trend direction, with the increase of dip angle, the amplification effect of inclined field increases; in the strike direction, when the dip angle of formation is less than 12.5 °, the amplification effect is stronger than that of horizontal stratigraphic field; , When the dip angle of the formation reaches 12.5 °, the site will amplify the portion of T≤0.1 s of the response spectrum and weaken the portion of T> 0.1 s. In the vertical direction, as the dip of the strata increases, The amplifying effect is stronger than that of horizontal stratigraphic sites. In slope direction, the amplifying effect of sloped sites is weaker than that of horizontal stratigraphic sites. In the vertical direction of slopes, the amplification effect of sloped sites is stronger than that of horizontal stratigraphic sites. The research results have certain reference meaning for the seismic design of buildings on the inclined inclined plane with small angle.