为了解结构设计参数对高速铁路钢箱叠合拱桥结构力学特性的影响，进而指导结构设计，以哈大高速铁路新开河桥（拱肋由上、下拱肋构成的新型桥梁）为工程背景，分析矢跨比、拱肋内倾角、横撑布置方式、吊杆布置形式、拱肋系梁刚度比等设计参数对该结构体系力学特性的影响。分析结果表明：矢跨比对拱脚内力影响较大，取值为1/5左右时较合理；拱肋内倾角对结构稳定与侧弯基频的影响较显著；横撑的数量、间距、刚度与布置方案对结构稳定性有显著影响，加强肋间横撑的横向或竖向连接均能有效地提高结构的稳定性；刚性吊杆的结构稳定性最好，柔性吊杆布置形式对结构竖弯基频与扭转基频影响较大；拱肋系梁刚度比对内力分布影响显著。%To investigate the impact of structural design parameters on the mechanical behavior of the high-speed railway steel box composite arch bridge and provide references to sample bridge , the Xinkaihe River Bridge on the Harbin-Dalian high-speed railway was taken as the sample bridge .The bridge takes a new type of structure ,the arch of which comprises the upper and lower arch ribs .T he impact of a series of design parameters on the mechanical behavior of such type of structure was analyzed ,including the rise-to-span ratio ,inclination of the arch ribs ,layout of the lateral bracings and the hangers and the ratio of the arch ribs and the tie beam stiffness .The re-sults of the analysis indicated that the rise-to-span ratio had prominent influence on the internal force of the arch springs and a rational value was considered around 1/5 .The inclination of the arch ribs showed significant impact on the stability and lateral bending fundamental frequency . T he amount ,spacing ,stiffness and layout of lateral bracings had obvious impact on the stability of the structure ,and strengthening the transverse and vertical connection of the lateral bracings be-tween the arch ribs would effectively enhance the stability of the structure .The rigid hangers had superior structural stability .The flexible layout of hangers showed great influence on the vertical fundamental frequency and torsional frequency of the structure .T he ratio of arch rib and tie beam stiffness had significant impact on the internal force distribution .
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