摘要
随着我国城市轨道交通的发展,大跨度城市轨道交通专用桥梁逐渐增多,大跨度城市轨道交通专用桥宽度窄,横向刚度较小,已成为设计中的控制性因素之一。为分析城市轨道交通专用桥梁横向刚度限值标准,对比我国现有铁路桥梁规范和城市轨道交通桥梁规范对于桥梁横向刚度的规定,如横向挠跨比、宽跨比等。搜集了部分大跨度铁路桥梁和城市轨道交通专用桥的横向刚度限值,并与规范进行对比分析。结果表明:我国城市轨道交通桥梁横向挠跨比的限值规定偏保守,当跨度远超规范适用范围时,仍要求满足横向挠跨比的规定时,可能会明显增加建设的成本;对于大跨度城市轨道交通专用桥,可通过风-车-桥耦合振动研究行车安全,作为对桥梁横向刚度评价的指标之一。
With the development of urban rail transit in China,special bridges for large-span urban rail transit are increasing gradually.The long-span urban rail transit bridges have narrow width and small lateral stiffness and become one of the control factors in the design.In order to analyze the lateral stiffness limit standard of urban rail transit special bridges,the provisions of China’s existing railway bridge codes and urban rail transit bridge specifications for transverse stiffness of bridges,such as transverse flexing ratio and wide span ratio,are compared.The lateral stiffness limits of some large-span railway bridges and urban rail transit bridges are collected and compared with the specifications.The results show that the limit of the lateral deflection ratio of urban rail transit bridges in China tends to be conservative.When the span is far beyond the scope of application and the transverse flexural ratio is still required,the cost of construction may be increased significantly.Wind-vehicle-bridge coupled vibration can be used as one of the indicators for evaluating the lateral stiffness of the bridge to study the traffic safety of urban rail transit special bridges.
作者
马虎
任文渊
向活跃
谢佳桃
李永乐
何孟松
MA Hu;REN Wenyuan;XIANG Huoyue;XIE Jiatao;LI Yongle;HE Mengsong(Chongqing rail transit(group)Co.,Ltd.,Chongqing 400042,China;Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2020年第10期68-72,共5页
Railway Standard Design
基金
国家自然科学基金项目(51778544,51978589,51525804)。
关键词
城市轨道交通
专用桥
横向刚度
横向挠跨比
宽跨比
规范对比
urban rail transit
special bridges
lateral stiffness
transverse deflection-span ratio
width-span ratio
specification comparison
