适用于三车道高速公路钢板组合梁的比选分析

钢板组合梁应用广泛,结构体系多样,以三车道16.25 m桥宽、40 m跨径为前提,分别按照法国、日本、美国的常用主梁间距和结构体系进行方案设计,并横向比较各体系的异同。分别对多主梁、少主梁进行计算分析,研究影响结构受力特性的因素,并列出梁高对主梁应力及位移的影响,得出随着梁高增加,钢主梁纵向应力、竖向位移均呈现显著的线性减小趋势。

Comparison,Selection and Analysis of Steel Plate Composite Girder Appropriate for Three-lane Expressway

The steel plate composite girder is widely used with many structural systems.On the premise of three-lane bridge with 16.25-m width and 40-m span,the scheme design is carried out respectively according to the main girder spacing and structural systems commonly used in France,Japan and America.The similarities and differences among the systems are found after the cross-sectional comparison.More girders and few girders are separately calculated and analyzed.The factors affecting the mechanical characteristic of structure are analyzed.The influences of girder height on the stress and displacement of the main girder are listed.It is found that the longitudinal stress and the vertical displacement of the main steel girder decrease linearly with the increase of girder height.The relative experience can guide the engineering practices and provide the reference for the similar projects.