基于混合消能减震技术的组合结构独柱高架站台抗震性能研究

结合高性能组合结构形式以及混合消能减震体系的双重技术优势，研发了适用于独柱长悬臂式高架站台结构的抗震体系。采用有限元分析软件MSC.MARC分别对该体系进行了强震作用下的静力弹塑性分析和动力弹塑性时程分析。分析结果表明基于MSC.MARC二次开发的纤维模型和采用宏观本构的一维非线性弹簧模型能高效准确地模拟站台结构的非线性动力特征以及损伤破坏规律。混合消能减震技术可显著提高结构的刚度和承载力，在降低主体构件耗能的同时增强结构的整体耗能能力。在体系层面，混合消能减震技术可明显改善结构刚度分布不均匀带来的不利影响，有效地降低结构的整体变形和层间位移角；在构件层面，消能减震体系能减少或避免主体构件的出铰，有效地降低主要承重构件的截面应力水平，降低悬臂梁所承受的扭矩。值得注意的是，在混合消能减震体系中，由于结构的各个薄弱环节均得到了加强，未受到消能减震构件保护的其他结构构件的地震响应可能会被放大。

Seismic performance of composite single-column elevated station with hybrid energy dissipation technique

This research aims at developing a new system that is particularly applicable for single-column and long-cantilever elevated station structures, through the combination of high-performance composite system and hybrid energy dissipation technique. Static pushover analysis and dynamic time-history analysis were conducted on the new system under seismic load based on MSC.MARC. Results show that fiber model and nonlinear spring model based on the secondary development of MSC.MARC are capable of simulating the nonlinear dynamic characteristics and damage mechanism. The hybrid energy dissipation technique could significantly improve the stiffness and strength of the structure, and increase the energy dissipation capacity of the whole structure while reduce the energy dissipation demand of the primary members. On the structural system level, the proposed energy dissipation system can mitigate the unfavorable effect due to the uneven stiffness distribution of the structure, and effectively reduce the global displacement and inter-story drift ratio of the structure. On the component level, the energy dissipation system can prevent the primary members from yielding,and effectively reduce the sectional stress of the primary members, as well as the torsional forces of the cantilevered beams. It should be noted that, in the structural system with hybrid energy dissipation technique, the seismic response of the unprotected members may be amplified because all the vulnerable members are strengthened by the energy dissipation devices.