地震动参数对高层混合结构破坏的影响

Effect of Earthquake Ground Motion Characteristics on the Seismic Damage of Hybrid Structures

采用15条地震波对3个层高不同周期不同的钢框架-钢筋混凝土剪力墙混合结构进行动力时程分析,以了解地震波的峰值速度与峰值加速度的比值、峰值加速度、以及强震持时对结构破损程度的影响.结果表明:地震波的幅值相同时,结构的破坏程度与地震波峰值速度与峰值加速度的比值呈正比;地震波峰值加速度的增大使结构破坏程度不断提高,提高的速度先急后缓;地震波强震持时对结构破坏的影响随结构自振周期增大而增大.根据研究结果提出了结构破损计算公式,该公式综合反映了地震波幅值、频谱特性对不同周期结构破坏的影响,利用它能较为准确地判断地震波对结构的破坏能力.

Three steel frame-reinforced concrete tube structures with different stories and different structural periods were analyzed, using 15 ground motion records, in order to obtain the sensitivity of the seismic damage of structures to the ratio of peak ground velocity to acceleration（ V/A ）, peak ground acceleration （A） and effective duration（△t ）of ground motion records . It was found that the damage increased with the increase of peak ground velocity to acceleration ratio for the same peak ground acceleration. The damage increased but the increased ratio decreased with the peak ground acceleration, and the effective duration had more influence on the structure of long period. Based on the conclusions, a new damage index describing the effects of V/A and A on hybrid structures of different periods was proposed, which provided a preferable estimation of measuring the damage potential of earthquake ground motion records.