漳州战备大桥极限承载能力分析  

Analysis on Ultimate Load Bearing Capacity of Zhangzhou Combat Readiness Bridge

作　　者：郑一峰[1] 黄侨[2] 何红丽 张连振[2] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026 [2]哈尔滨工业大学交通学院,黑龙江哈尔滨150090 [3]沈阳市政工程设计研究院,辽宁沈阳110015

出　　处：《公路交通科技》2010年第2期60-64,70,共6页Journal of Highway and Transportation Research and Development

摘　　要：为深入研究部分斜拉桥的极限承载能力,以国内第1座已建混凝土部分斜拉桥——漳州战备大桥为例,对其进行极限承载能力分析。运用ANSYS有限元分析软件,采用基于非线性连续介质力学理论的全过程分析方法,假定混凝土为理想的弹塑性材料,采用Drucker-prager屈服准则,钢筋为多线性等向强化材料,采用Mises屈服准则,建立了有限元U.L.列式的几何非线性与材料非线性耦合空间分析模型。分析结果表明:当活载系数λ<3时,部分斜拉桥结构的非线性特征不明显。部分斜拉桥达到极限承载力时,其破坏模式属材料强度达极限状态这种类型,此时结构还未出现极值点失稳现象。决定其极限承载力的主要因素是混凝土材料非线性。中跨布载时结构极限承载力最小,活载系数λ=7.8,极限安全系数k=1.78。Partially cable-stayed bridge is a new kind of bridge lies in between continuous beam bridge and cablestayed bridge. Zhangzhou Combat Readiness Bridge, the first concrete partially cable-stayed bridge in China, was chosen to analyze the ultimate bearing capacity of partially cable-stayed bridge. The material of concrete and steel was supposed to be an ideal elastic-plastic material and multi-linear isotropic hardening material which adopt Drucker-prager and Mises yield criterion separately. The UL formula considering geometrical nonlinearity and material nonlinearity was used in finite element model by using ANSYS software and the full-range analysis method based on nonlinear continuum mechanics. The analyses indicate that （1） the nonlinear characteristic of partially cable-stayed bridge is not evident when the live load factor λ is less than 3; （2） the material strength exceeds the ultimate strength when the ultimate load bearing capacity of partially cable-stayed bridge is reached, and the destabilization phenomena does not appear; （3） the material nonlinearity of concrete is the main factor affecting the ultimate load bearing capacity of partially cable-stayed bridge; （4） the load bearing capacity is minimum when the load is disposed on midspan, and the live load factor λ is 7.8 and the ultimate safety factor k is 1.78.

关 键 词：桥梁工程 极限承载力 数值分析 部分斜拉桥 几何非线性 材料非线性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]