摘要
目前大跨预应力混凝土(PC)连续刚构箱梁桥在运营过程中普遍存在梁体开裂和跨中下挠病害,至今无法有效解决。根据依托工程建立结构空间有限元分析模型,研究分析了纵向和竖向预应力损失、结构超重、混凝土加载龄期、跨中下挠等不利因素对大跨PC连续刚构桥工作性能和受力情况的影响,因而避免结构因上述因素而产生过量的开裂和下挠,并为完善此类桥梁的设计和施工方法提供依据。
Recently,crack of box girder and mid-span deflection are the main diseases in the operation of the long-span prestressed concrete（PC） continuous rigid frame box-girder bridges,and hasn’ t been effectively solved until to now.The structural finite analysis model of space was built relies on established engineering to study and analysis the influence of long-span PC continuous rigid frame bridge on working performance and stress situation caused by longitudinal and vertical prestressing loss、structure overweight、load time、deflection and so on.so we avoid the excessive cracking and deflection caused by the above factors,and provide the basis to improve this kind of bridge design and construction methods.
出处
《公路工程》
北大核心
2013年第4期50-53,83,共5页
Highway Engineering
基金
广东省交通厅科技项目(201102036)
湖南省自然科学基金项目(10JJ3012)
关键词
大跨PC连续刚构桥
开裂
下挠
有限元分析
预应力损失
超重
long-span PC continuous rigid frame bridge
crack
deflection
finite analysis
prestressing loss
overweight
