横撑系统对系杆拱桥动力特性的影响  

Effect of Transverse Bracing System on Dynamic Characteristics of Tied Arch Bridge

作　　者：王海城[1] 黄己伟[2] 刘丹[3] WANG Haicheng;HUANG Jiwei;LIU Dan(National Center for Quality Supervision and Test of Building Engineering,Beijing 100013;Department of Management Engineering,Sichuan College of Architectural Technology,Deyang Sichuan 618000;Department of Civil Engineering,Sichuan College of Architectural Technology,Deyang Sichuan 618000)

机构地区：[1]国家建筑工程质量监督检验中心,北京100013 [2]四川建筑职业技术学院工程管理系,四川德阳618000 [3]四川建筑职业技术学院土木工程系,四川德阳618000

出　　处：《湖北理工学院学报》2019年第5期36-39,72,共5页Journal of Hubei Polytechnic University

摘　　要：为了分析钢管混凝土桥拱肋横撑系统对桥梁结构动力特性的影响,采用Midas/Civil 2013对某一跨径为240 m的中承式钢管混凝土系杆拱桥建立了桥梁三维空间有限元模型,对比分析了横撑的截面形式、刚度和布置方式等因素对拱桥动力特性的影响。结果表明,"K"型横撑截面比"米"型横撑截面的结构横向刚度及横向稳定性更好,且在一定范围内,增大横撑刚度可以加强主拱肋的横向刚度,但超出范围后,再提高横撑刚度则会引起自振频率减小。在拱脚和拱顶处设置横撑,能提高结构的横向刚度以及弯扭振动频率。Aiming at the influence of the crossbar of concrete filled steel tubular arch bridge on the structural dynamic characteristics, Midas/Civil 2013 is used to establish three-dimensional finite element model for a half-through concrete filled steel tubular tied arch bridge with a span of 240 m. The effects of cross-section, stiffness and arrangement on the dynamic characteristics of the arch bridge are analyzed. The results show that the cross-section of K-type brace is better than that of "Pozi"-type brace in the structural lateral stiffness and stability. Within a certain range, the lateral stiffness of the main arch rib can be strengthened by increasing the transverse bracing stiffness. But beyond the range, the natural frequency will decrease if the bracing stiffness is increased. The structural transverse and torsional vibration frequencies can be improved by setting transverse braces at the arch foot and vault.

关 键 词：钢管混凝土拱桥 有限元法 动力特性 拱肋横撑 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]