带端部阻尼器伸臂桁架的抗震性能试验研究

伸臂桁架是超高层建筑中的关键构件，改善其耗能能力对提升结构的抗震性能具有重要价值。该文在普通伸臂桁架拟静力试验研究基础上，进行了端部带阻尼器的伸臂桁架抗震性能的试验研究。研究结果表明，辅助装置是保证端部阻尼器剪切受力状态的必要构成，在端部设置的软钢阻尼器及摩擦阻尼器能够改善耗能能力，保护伸臂桁架杆件不受损伤。端部设置的摩擦阻尼器因为其刚度及强度可以解耦，具有较大的设计自由度，有利于工程中的应用和推广。该文进一步分析了在伸臂桁架中设置软钢阻尼器的可行性，结果表明由于在软钢阻尼器刚度和强度耦合，难以同时满足伸臂桁架刚度和强度的设计需求，因此在工程中的应用有待进一步研究。

EXPERIMENTAL STUDY ON THE SEISMIC PERFORMANCE OF DAMPED OUTRIGGERS

The outriggers are the key components of super tall buildings. Increasing the energy dissipation capacities of outriggers has significant value on improving the structural seismic performance. Based on the pseudo-static test of a conventional outrigger, the seismic performance of outriggers with different dampers was investigated through experiments in this study. The results indicated that the auxiliary devices should be installed to ensure the pure shear deformation state of the dampers. Installing either mild steel dampers or friction dampers at the end of the outrigger could improve its energy dissipation capacity and prevent its components from being damaged. As the stiffness and strength of a friction damper can be decoupled, the design process of such damper in the outriggers was much operable, making it more adoptable and promotable in engineering practice. Moreover, the feasibility of using mild steel dampers in the outriggers was also analyzed in this study. It was found that due to the coupling of stiffness and strength of mild steel dampers, the design requirements for the stiffness and strength of outriggers were hard to meet simultaneously. Therefore, further in-depth studies on the application of outrigger with mild steel dampers are needed.