基于混凝土三轴强度退化模型的非通航孔桥桥墩正常使用极限状态评估  

Evaluation of Ultimate State of Non-navigable Spans Bridge Piers Based on Degradation Models of Concrete Triaxial Strength

作　　者：赵迁乔[1] 宋夫才 蔡建军 刘承论[1] 

机构地区：[1]山东科技大学资源与环境工程学院,山东青岛266510 [2]青岛市公路规划设计院,山东青岛266061 [3]山东高速青岛公路有限公司,山东青岛266061

出　　处：《公路交通科技》2011年第10期70-74,共5页Journal of Highway and Transportation Research and Development

基　　金：青岛市交通运输委项目;山东高速青岛公路有限公司项目

摘　　要：为了对跨海大桥在海水冻融和侵蚀耦合作用下的开裂性能进行评估,通过建立混凝土冻融+侵蚀耦合损伤Ottosen强度准则,结合跨海大桥非通航孔桥的结构特点和北方近海环境,计算分析、评估了非通航孔桥混凝土承台底部几个关键点的抗裂性能。结果表明,在百年一遇波浪荷载作用下或在百年一遇冰荷载作用下,在服役130 a时非通航孔桥会在混凝土承台底部中间位置(E点)、A点和C点位置出现混凝土裂缝,即在百年一遇的冰荷载或波浪荷载作用下,桥墩安全服役时间为130 a。因此在设计、施工过程中必须加强承台底部混凝土裂缝的控制,以提高跨海桥梁混凝土结构耐久性的寿命。In order to assess the cracking performance of cross-sea bridge in water freezing - thaw and erosion coupling, through establishment of the Ottosen strength criterion on concrete freeze-thaw and erosion, combined with the characteristics of northern freezing coastal areas and the structure of non-navigable bridge, the crack resistance performance of a few key points on the bottom of concrete pile cap of non-navigational bridge were analysed and assessed. The results show that cracks will occur at the bottom of concrete pile cap （midpoint E, point A and point C） after 130 years service under the wave load or ice load once in the hundred years, i. e. , security service time of the piers is 130 years. Therefore, in design and construction process, the control of concrete crack of the pile cap bottom should be strengthened to improve the durability of the bridge stucture.

关 键 词：桥梁工程 Ottosen强度准则 极限状态评估 桥墩 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]