拱辅梁桥拱肋合理矢跨比的确定  

Determination of reasonable arch rib rise-span ratio on arch-auxiliary girder bridge

作　　者：桂成中[1] 雷俊卿[1] 张永水[2] 

机构地区：[1]北京交通大学土木建筑学院,北京100044 [2]重庆交通大学土木建筑学院,重庆400074

出　　处：《北京交通大学学报》2014年第4期115-121,共7页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(51178042);铁道部科技研究开发重点课题资助项目(2008G007-E);高等学校博士学科点专项科研基金资助项目(20100009110017)

摘　　要：拱肋矢跨比对拱辅梁桥的力学特性影响大,为寻求其合理范围,以梁拱相同刚度比而不同矢跨比为条件,从自振模态和多遇及罕遇地震作用下结构动力响应角度,结合工程实例,运用时程分析法及多自由度体系简化的滞回曲线,研究矢跨比变化对全桥变位及内力影响的规律,并提出相应的合理设计范围.研究表明,拱肋矢跨比主要影响横桥向、竖向位移及内力,且矢跨比为1/5时桥梁抗震性能最优;对于多自由度体系变位组合中的主要成分得出的简化滞回曲线,由其定性分析得出的结论能与一般时程分析得出的结论一致.Reasonability of arch rib rise-span ratio largely affects mechanical characteristic of arch-auxil- iary girder bridge. For exploring its reasonable range, combined with engineering example, under the condition of same beam-arch stiffness ratio but different rise-span ratios, from dynamic response per- spective of the natural vibration modes and the action of Frequent ＆ Server Seismic Wave （FSW ＆ SSW） on structure, rules of displacements and internal forces of the whole bridge following rise-span ratio changing are analyzed, and corresponding reasonable design range is put forward. Research has shown that arch rib rise-span ratio mainly affects transverse, vertical displacements and internal forces. When rise-span ratio is 1/5, anti-seismic performance of the bridge is optimal. For simplified hys- teretic curves concluded from dominated components of displacement combinations of multi degree of freedom （MDOF） system, the conclusion deduced from qualitative analysis, is corresponding with general time-history analysis.

关 键 词：拱辅梁桥 拱肋矢跨比 组合结构 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]