摘要
研究目的:宜万铁路宜昌长江大桥为新型刚梁柔拱组合桥梁结构体系,主跨跨度达275 m。通过对该桥在地震作用下的动力响应分析,了解该类桥型的动力特征和抗震性能,找出有关部位存在的抗震薄弱环节,设计时予以重视和借鉴。研究结论:通过对新型刚梁柔拱组合桥梁结构抗震性能的研究与分析,得出如下结论:连续刚构柔性拱桥与传统梁桥类似,抗震性能较好,但刚构拱桥的墩梁结合区和主墩墩底存在抗震的薄弱环节,设计时应予以重视;主拱的地震内力响应较小,但位移响应较大,在地震高烈度区设计该类桥梁时,应研究采用必要的限位措施。
Research purposes： The Yichang Yangtze Bridge on the railway from Yichang to Wanzhou, is a long -span composite bridge with rigid frame and tender arch,with the main span of 275 m. By analysis of the dynamic response of the bridge under seismic action, this paper studies the dynamic and aseismic characteristics of such kind bridge to seek the weak points of aseismic behavior for paying attention to them in design. Research conclusions： From the study and analysis of the aseismic behavior of a long - span composite bridge with rigid frame and tender arch, it is concluded that, compared with the traditional bridge, the aseismic behavior of a long - span composite bridge with rigid frame and tender arch is better, but the joint between pier and girder and the pier bottom are poor at aseismic behavior. We should pay more attention in design. Generaly speaking, the tender arch has a larger displacement response, though its inner force response is small. Thus the arch top needs to be restricted due to great amount of transverse movement in case, this type of bridge is built in a high - intensity earthquake area.
出处
《铁道工程学报》
EI
北大核心
2009年第9期50-54,共5页
Journal of Railway Engineering Society
关键词
刚构拱桥
大质量法
人工合成波
抗震响应
性能分析
bridge with rigid frame and tender arch
large mass method
artificial earthquake wave
aseismie response
property analysis
