倾斜式单肋系杆拱步行桥稳定性分析  

Analysis on Stability of Tilted Single-rib Bowstring Arch Footbridge

作　　者：王艳军[1] 杨光 

机构地区：[1]中国市政工程华北设计研究总院,天津市300074 [2]林同棪国际工程咨询(中国)有限公司沈阳分公司,辽宁沈阳110013

出　　处：《城市道桥与防洪》2014年第6期81-83,112,共4页Urban Roads Bridges & Flood Control

摘　　要：以某倾斜式单肋系杆拱步行桥为工程背景，采用midascivil建立空间有限元模型，分析了不同的拱肋含钢率、拱肋外倾角、拱肋失跨比等设计参数对桥梁结构稳定性的影响。分析结果表明：结构的第1阶稳定系数随拱肋含钢率的增加而增大；拱肋外倾角α在-15°～20°范围内变化时，结构第1阶稳定系数先增大后减小；当5°≤α≤10°时，结构存在最大的第1阶稳定系数，结构第1阶稳定系数随着失跨比的增加而逐渐减小。结构第1阶失稳模态均为拱肋面外侧倾失稳。Taking a tilted single-rib bowstring arch footbridge as the engineering background, the article introduces the space finite element model established by midas civil, and analyzes the influence of the different design parameters of arch rib steel ratio, arch rib camber angle and arch rib rise-span ratio on the stability of bridge structure. The result shows that the first order stability coefficient of structure increases with the increment of arch rib steel ratio, and firstly increases and then decreases when the arch rib camber angleα changes within the range of-15°~20°. There is the maximum first order stability coefficient of structure when 5°≤α≤10°. The first order stability coefficient of structure gradually decreases with the increment of rise-span ratio. The first order instability mode of structure is the arch rib face outer slope instability.

关 键 词：倾斜式 单肋系杆拱 稳定性 失跨比 含钢率 倾斜角 

分 类 号：U441[建筑科学—桥梁与隧道工程]