钢箱梁在浮桥承压舟中的应用

Application of Steel Box Girder in Double Bearing Boat

梁式钢桥是公路和铁路桥梁的主要形式,它是在竖直荷载作用下,主梁截面只有弯矩和剪力,无轴向力.主梁的形式有钢板梁、钢箱梁和钢桁梁.钢板梁是指由钢板或型钢等通过焊接、螺栓或铆钉等连接而成的Ⅰ字形截面的实腹式梁;钢箱梁是指由钢板或型钢等通过焊接、螺栓或铆钉等连接而成的箱形截面的实腹式梁.由于简支钢板梁桥的结构形式简单,造价经济,是中小跨径桥梁最常用的形式.箱梁是封闭体,其抗弯能力、跨越能力和抗扭能力都优于板梁,当桥梁的跨径较大时,箱形梁桥比板形梁桥较为经济、合理.搭建浮桥用的双体承压舟是一种结构形式特殊的钢梁桥,两侧的舟体是桥脚,中间的连接桥是简支的钢梁.通过计算与分析,探讨箱梁在浮桥承压舟中的应用.

Beam steel bridge is the main form of roads and railway bridges,under the vertical loods,only bending moments and shear forces but no axial forces exist on its beam section.There are three forms of the main beam： the steel girder,the steel box girder and the steel truss.The steel girder is a kind of solid-type beam with I shaped cross section,which is formed by the steel plate or steel reinforced etc.connected by welding,bolting or riveting.The steel box girder is formed same as the steel girder,but its cross section is a box shape.As the structure of simply supported steel plate girder bridge is simple and its cost is low,it is most commonly used in medium span bridges.Box girder is a closed body,the bending resistance,span capacity and anti-twisting property are better than the plate beam.When the bridge span is large,the box girder bridge is more economical and reasonalbe than the plate girder bridge.The doulbe bearing boat used in constructing floating bridges is a particular steel beam bridge that the boat body is the foot of the bridge and the connection bridge in the middle is the simply-supported steel beam.By means of calculating and analysis,the application of the box girder in doulbe bearing boats is discussed.