【摘要】 以一座试设计斜拉桥为例,采用动力弹塑性时程分析并以Park损伤指数、位移作为评价指标,研究采用辅助墩的斜拉桥顺桥向结构体系的抗震性能,并探讨不同型式桥墩对其抗震性能和损伤控制效果的影响。结果表明:采用新型辅助墩的超大跨斜拉桥顺桥向结构体系具有更好的抗震性能和损伤控制效果,且具有分层耗能机制,即附加的耗能构件可有效减缓辅助墩的地震损伤,辅助墩又可有效减缓主塔的地震损伤;附有剪切连杆的新型桥墩的抗震性能优于传统型桥墩,剪切连杆不仅可提高桥墩的刚度,而且可有效减小其地震损伤,起附加耗能作用。更多还原

【Abstract】 Elasto-plastic analyses were carried out to investigate the seismic performance of a novel structural system, the core of which is to share more the girder inertia force and to dissipate more earthquake input energy and to limit the seismic damage of tower by a novel supporting pier. In addition, the influences of several types of supporting pier on the seismic performance and damage controlling of the novel structural system were investigated. In this paper, aiming at a trial designed cable-stayed bridge with a central span of 1,400 m, numerical simulation techniques are utilized to analyze the seismic performance of the novel structural system based on Park damage indices and displacement under extremely earthquake input with PGA=1.0g. The results show that the effects of the novel structural system with novel supporting piers on improving seismic performance is superior to those of the structural system with other piers; the novel structural system is a hierarchical energy dissipation mechanisms of structural system, namely the supplemental energy dissipation components can effectively mitigate the seismic damage of the supporting pier and the supporting pier can effectively mitigate the seismic damage of the tower; the seismic performance of the novel pier with shear links are superior to these of conventional piers because the shear links can not only increase the stiffness of piers, but also mitigate the seismic damage of piers.更多还原