在超高层建筑结构体系中，相对于传统伸臂桁架，新型消能减震伸臂桁架能显著提高结构的抗震性能，但同时也存在一些不可避免的问题。屈曲约束支撑伸臂桁架在小震下仅提供刚度不耗能，在中震下屈服耗能有限；黏滞阻尼伸臂桁架因黏滞阻尼器自身最大阻尼力限制，在中震和大震下对结构侧移控制效果不佳。混合控制消能减震伸臂桁架结构综合利用多种消能构件，同时为结构提供足够刚度和附加阻尼，具有更为全面的抗震性能。本文以上海中心为研究背景，研究了混合控制消能减震伸臂桁架结构在各烈度地震作用下的消能减震效果，同时探讨了黏滞阻尼伸臂桁架与屈曲约束支撑伸臂桁架相对数量变化对结构抗震性能产生的影响。将为消能减震伸臂桁架超高层结构体系的进一步研究和应用提供借鉴。%In a super high-rise structure system,compared with traditional outriggers,the new energy dissipation outriggers can obviously improve the structural aseismic behavior.However,there are some inevitable problems for this type of outriggers.Outriggers with BRBs merely provide stiffness without energy dissipation under frequent earthquakes and they yield and dissipate limited energy under medium earthquakes.Outriggers with viscous dampers can't control structural lateral displacements well under medium and rare earthquakes,due to the limited maximum damping force of dampers.Super-tall structure with hybrid controlled energy dissipation outriggers (SHCEDOs) can provide enough stiffness and additional damping,so they have comprehensive aseismic performances.Here,based on Shanghai Center, the effects of energy dissipation and vibration reduction of SHCEDOs under all types of earthquakes were studied,and the influences of relative quantitative variations between outriggers with viscous dampers and those with BRBs on structural aseismic performances were analyzed.The results provided a reference for further investigating super-tall buildings with energy dissipation outriggers and their application.
展开▼
