摘要
某新建跨河桥梁采用上承式斜腿刚架桥桥型,上部主梁采用多梁式变高度钢-混组合梁,斜腿采用等高度钢骨混凝土组合结构。桥宽较大,上部结构钢梁的有效跨径较小,宽跨比大于0.5。理论计算中用一般来分析荷载横向分布系数的方法,如杠杆原理法、刚性横梁法、铰接梁法等在本桥设计中很难再适用,采用通用有限元程序,通过数值模拟计算,求得该桥梁各截面的主梁横向分布影响线,分析各截面的横向影响线分布规律,跨中截面边梁横向分配系数较大,而斜腿处中梁横向分配系数最大。对该类桥梁的设计具有积极参考意义。
A deck-type rigid-frame bridge with inclined legs was built as a new urban bridge across a river.The main girder of this bridge is a varying-depth steel-concrete composite girder with multiple sub-girders,and the inclined legs are equal-height steel reinforced concrete structures.The width of a sub-bridge is larger,but the effective span of the superstructure is relatively small,leading to a large widthto-span ratio over 0.5.Therefore,traditional methods to calculate the transverse load distribution coefficient such as the lever principle method,the rigid beam method,the hinged beam method are no longer valid.The influence lines of the transverse load distribution of each cross-section of the main girder in this bridge were developed based on finite element simulation.Characteristics of these influence lines are then analyzed,the transverse distribution Coefficient of the middle section of the side beam is larger and the transverse distribution coefficient of the middle beam at the slant leg is the largest.Has positive reference significance for the design of this kind of bridge.
作者
蒋华
JIANG Hua(Shenzhen Municipal Design&Research Institute Co.,Ltd.Shenzhen 518029,China)
出处
《广东土木与建筑》
2021年第6期67-70,共4页
Guangdong Architecture Civil Engineering
关键词
桥梁工程
斜腿刚架桥
钢-混组合
有限元分析
横向分布系数
bridge engineering
rigid-frame bridge with inclined legs
steel-concrete composite
finite element analysis
transverse distribution coefficient
