上承式加V拱桥力学特性及体系转换试验研究  

Experimental Investigation of Mechanical Properties and System Conversion of Deck Arch Bridge with V-shaped Members

作　　者：喻泽成 周远航 谢肖礼[1] 向桂兵 YU Zecheng;ZHOU Yuanhang;XIE Xiaoli;XIANG Guibing(College of Civil Engineering,Guangxi University,Nanning 530004,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning 530007,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西交科集团有限公司,南宁530007

出　　处：《铁道标准设计》2022年第4期132-137,167,共7页Railway Standard Design

基　　金：广西重点研发计划项目(桂科AB18126047);广西防灾减灾与工程安全重点实验室系统性研究项目(2016ZDX0001)。

摘　　要：在恒载作用下,上承式拱桥可通过设置合理拱轴线达到拱肋成为小偏心受压构件的目的。然而,在活载作用下,拱肋不再是单向受力状态,伴随明显的弯剪变形,导致力学性能下降,在一定程度上限制了大跨拱桥在活载占比重较大的铁路桥中的应用。据此,基于拱式、桁式结构的受力特点,考虑合理的体系转换方式,提出一种上承式加V拱桥结构,研究其力学特性和体系转换机理,并分别采用试验和有限元方法对其进行验证。试验研究表明,体系转换前后,上承式加V拱桥分别体现拱式结构和桁式结构受力特点;与同等用钢量的上承式拱桥相比,在结构强度和稳定性不降低的情况下,上承式加V拱桥竖向刚度和面内自振频率分别提高54.75%和104.28%。Under dead load,the arch rib of deck arch bridge can become a small eccentric compression member by setting a reasonable arch axis.However,under live load,its non-axial force state,accompanied by obvious bending and shear deformation,leads to a decrease in mechanical properties,which limits the application of the large-span railway arch bridge bearing a large proportion of live load.For this reason,a deck arch bridge with V-shaped members is proposed based on the mechanical characteristics of arch and truss structures and reasonable system conversion strategy.Then,its mechanical characteristics and system conversion mechanism are studied and validated with experiments and finite element method.The experimental results show that the deck arch bridge with V-shaped members reflects respectively the mechanical characteristics of both arch structure and truss structure before and after system conversion.Compared with traditional deck arch bridge with same amount of steel,its vertical stiffness and in-plane natural vibration frequency are increased by 54.75%and 104.28%respectively in the case that the strength and stability of the deck arch bridge with V-shaped members do not decrease.

关 键 词：上承式拱桥 刚度 体系转换 桁式结构 V形构件 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]