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针对山区多层接地消能减震异形柱框架结构,研究土体刚度、陡坎高度、陡坎下方掉层跨数对结构地震反应和减震效果的影响。分析表明:1)多层接地结构的自振频率随着土体软度的增大而变小,随着陡坎高度的增大而增大,随着陡坎下掉层跨数的增大而减小,但陡坎高度增大到一定程度后,会降低结构的高阶频率;2)多层接地结构的层位移随着土体软度的增大而变小,地基土刚度对结构层间位移、层间剪力和加速度反应的影响与地震动输入密切相关,当地震动输入的高频含量较少时,土体越软,地震反应越大;当地震波输入的高频含量较多时,在特软土情况下地震反应有可能减小;3)无控结构的地震反应受陡坎高度和掉层跨数的影响规律与地震动输入相关,而受控结构则受地震动的影响较小;且陡坎高度和掉层跨数对结构陡坎下方楼层的层间反应影响较大,而对陡坎上方楼层影响较小;4)多层接地减震结构的减震效果不仅与场地条件相关,还与地震动输入密切相关,应根据场地条件和地震分组情况合理选择阻尼器的数量和参数,才能达到较好的减震效果。
Aiming at the frame structure of multi-layer grounded energy-dissipating and damping special-shaped columns in mountainous area, the influences of soil stiffness, height of scarp ridge and spilled limestone under the hurdle on seismic response and damping effect of structures are studied. The analysis shows that: 1) the natural frequency of multi-layer grounding structure becomes smaller with the increase of soil softness, and increases with the height of scarp, But the height of scarp ridge increases to a certain extent, it will reduce the higher order frequency of structure. 2) The layer displacement of multi-story grounding structure becomes smaller with the increase of soil softness, The influence of interlayer displacement, interlaminar shear force and acceleration response is closely related to the ground motion input. When the local high frequency content of the ground motion input is small, the softer the soil, the greater the seismic response. When the high frequency content , The seismic response may decrease in the case of extra-soft soil. (3) The law of uncontrolled seismic response affected by the height of the scarp and the span of the stratum is related to the ground motion input, while the controlled structure is affected by ground motion And the height of scarp ridge and the number of stratum spans have a greater influence on the interlayer reaction of the floor below the scarp ridge and less on the floor above the scarp ridge.4) The damping effect of the multi-layer grounding shock absorber structure is not only related to Site conditions, but also with the earthquake input is closely related to the conditions should be based on site conditions and earthquake grouping together Select the damper and the number of parameters in order to achieve a better damping effect.