高速铁路钢箱叠合拱桥结构设计参数影响性研究

发布时间：2018-01-20 20:36

本文关键词： 铁路桥钢箱叠合拱矢跨比拱肋内倾角横撑连接方式吊杆布置形式拱肋系梁刚度比力学性能参数分析　出处：《世界桥梁》2014年04期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to understand the influence of structural design parameters on structural mechanical properties of high speed railway steel box superimposed arch bridge and to guide the structural design, the Xinkai River Bridge (arch rib) is used in Hada high-speed railway. The new bridge composed of the lower arch rib) is the engineering background. It analyzes the rise-span ratio, the inclination angle of the arch rib, the arrangement mode of transverse brace, and the arrangement form of suspender. The influence of the design parameters such as stiffness ratio of arch rib beam on the mechanical properties of the structure system is analyzed. The results show that the rise-span ratio has a great influence on the internal force of the arch foot and is more reasonable when the value is about 1/5; The influence of the inclination angle of the arch rib on the stability of the structure and the fundamental frequency of lateral bending is significant. The number, spacing, stiffness and arrangement of transverse braces have a significant effect on the stability of the structure, and strengthening the transverse or vertical connections between the ribs can effectively improve the stability of the structure. The stability of rigid suspenders is the best, and the configuration of flexible suspenders has great influence on the fundamental frequency of vertical bending and torsion. The stiffness ratio of arch rib beam has a significant effect on the distribution of internal force.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然基金项目资助(51178042) 铁道部科技研究开发计划重大项目资助(2008G007-E)
【分类号】：U448.22
【正文快照】： 1引言结构在荷载作用下,其传力路径越短,结构越合理。在桥梁主要的受力平面内,拉压杆件的传力路径较受弯构件而言较短,应力均匀流畅,传力简洁且材料效能更大[1]。从力学角度来看,梁拱组合体系是一种传力合理、能量较小的结构。通过数值解析、有限元模拟以及模型试验相结合的研

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